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Journal of Clinical and Diagnostic Research. 2014 Sep, Vol-8(9): ZC41-ZC44 
41 
DOI: 10.7860/JCDR/2014/8817.4856 
Original Article 
Chronic periodontitis, Drug delivery, Porphyromonas gingivalis, Propolis 
Nehal N Sanghani1, Shivaprasad BM2, savita S3 
INTRODUCTION 
Periodontitis has multifactorial aetiology with the primary aetiologic agents being pathogenic bacteria that reside in the subgingival area and possess potent mechanisms of damaging host defences. Inflammatory responses triggered in response to periodontal pathogens are the major events responsible for periodontal destruction [1,2]. 
Treatment of periodontal disease is directed towards the suppression /elimination of subgingival microflora. Root debridement performed by mechanical means, i.e., scaling and root planing (SRP), is the most commonly used initial treatment approach [3]. However, comprehensive mechanical debridement of sites with deep periodontal pockets is difficult to accomplish. It alone, may fail to eliminate the pathogenic microflora because of their location within the gingiva or in areas inaccessible to periodontal instruments [3]. In view of the complex ecosystem within the subgingival pocket, the adjunctive use of antimicrobial agents have been advocated along with mechanical instrumentation to minimize the need for surgical treatment of pockets [4]. 
Local antimicrobial therapy has the advantage of providing effective concentration of the drug at the site of infection with minimal systemic load and low risk for the emergence of bacterial resistance [3-5]. The clinical use of antibiotics and other antimicrobial agents, as adjuvants for the treatment of periodontitis, has been extensively investigated [4-6]. Recently, special attention has been paid to natural medication, and Indian propolis is one of them which has drawn the attention over a long period of time [7-9]. 
Propolis is the generic name for a complex resinous mixture collected by honey bees from the buds and exudates of various plants [9]. Once collected, this material is enriched with saliva and enzyme- containing secretions and used in the construction, adaptation, and protection of hives [9]. The medicinal properties of propolis have been investigated previously [10,11]. 
Contemporary research involving propolis highlights its antimicrobial [6] and anti-inflammatory activities [11]. Anti-inflammatory property of propolis is due to the presence of caffeic acid phenethyl ester 
D 
entistry Section 
Health from the Hive: Propolis as an Adjuvant in the Treatment of Chronic Periodontitis - 
A Clinicomicrobiologic Study 
ABSTRACT 
Objectives: This study was aimed at the clinical and microbiological evaluation of the efficacy of subgingivally delivered Indian propolis extract as an adjunct to scaling and root planing (SRP) in the treatment of periodontitis. 
Materials and Methods: Twenty patients diagnosed with chronic periodontitis presenting a minimum of two pockets (probing depth ≥5 mm) were selected. Sites were assigned randomly into control sites (n=20) which received SRP alone or test sites (n=20) which received SRP and locally delivered propolis. At selected sites, the clinical parameters were assessed and subgingival plaque samples were collected at baseline, 15 days and one month. The samples were cultured anerobically for periodontal pathogens. 
Results: The results indicated that there was a significant improvement in both clinical and microbiological parameters (p<0.01) in the test sites compared to the control sites at the end of the study. 
Conclusion: Subgingival delivery of propolis showed promising results as an adjunct to SRP in patients with chronic periodontitis when assessed by clinical and microbiological parameters. (CAPE) in propolis. Flavonoids and cinnamic acid derivatives have been considered as the main biologically active components in propolis [11]. 
Propolis has been used for the treatment of aphthous ulcers [12], candidiasis [13], gingivitis [14], periodontitis [15], and pulpitis [16]. Studies on propolis applications have increased because of its therapeutic and biological properties. A study evaluated the antibacterial action of propolis against certain anaerobic oral pathogens and found it to be very effective against Peptostreptococcus anaerobius, Lactobacillus acidophilus, Actinomyces naeslundii, Prevotella oralis, Prevotella melaninogenica, Porphyromonas gingivalis, Fusobacterium nucleatum and Veillonella parvula [17]. Recently, a study was conducted to explore the clinical and microbiological efficacy of propolis extract as a subgingival irrigant in periodontal treatment. It was concluded that subgingival irrigation with propolis extract can be considered as an adjuvant to SRP [15]. However, the effect of propolis as a local drug delivery agent in treatment of chronic periodontitis, in relation to the clinical and microbiological parameters has not been studied till date, according to the best of our knowledge. 
Hence, the present study was aimed at clinical and microbiological evaluation of the efficacy of subgingivally delivered Indian propolis extract as an adjunct to SRP in the treatment of periodontitis. 
MATERIALS AND METHODS 
The randomized, controlled, parallel, double-blind study (clinician and microbiologist) was conducted at Department of Periodontics, Rajarajeswari Dental College and Hospital, Bangalore, India. Twenty patients, 9 males and 11 females, Aged 25 to 50 years (mean age, 35.6 ± 12.2 y) were included in the study after performing the power analysis. The study was conducted from December 2012 to August 2013. Prior to the execution of the treatment, written informed consent was obtained and the treatment procedure was explained to the patient. Ethical clearance was obtained from Institutional Ethical Committee Review Board. The treatment comprised of two groups. Control group, in which the sites were treated by SRP alone and in the test group, the sites were treated by SRP followed by
Nehal N Sanghani et al., Propolis in the Treatment of Chronic Periodontitis www.jcdr.net 
Journal of Clinical and Diagnostic Research. 2014 Sep, Vol-8(9): ZC41-ZC44 
42 
Control Site (SRP) 
T 
est Site (SRP + Propolis) 
Baseline (Mean 
+SD) 
15 DAYS (Mean 
+SD) 
1 Month (Mean 
+SD) 
Baseline (Mean 
+SD) 
15 DAYS (Mean 
+SD) 
1 MONTH (Mean 
+SD) 
Mean GI 
2.05+0.32 
1.63+0.17 
1.20+0.22 
2.04+0.26 
1.43+0.16 
0.96+0.09 
Mean BI 
2.90+0.45 
2.20+0.22 
1.60+0.21 
2.99+0.32 
2.15+0.22 
1.08+0.23 
Mean PPD 
5.10+0.55 
4.55+0.83 
3.75+0.79 
5.35+0.67 
4.60+0.68 
3.60+0.68 
Mean 
CAL 
3.10+0.55 
2.55+0.83 
1.75+0.79 
3.35+0.67 
2.10+0.79 
1.60+0.68 
Clinical Data 
% Change at Control Sites (Srp) 
% Change at Test Sites 
(Srp + Propolis) 
Baseline- 15 Days 
& p-value* 
Baseline- 30 Days & p-value* 
15 Days - 30 Days & p-value* 
Baseline- 15 Days & p-value* 
Baseline- 30 Days & p-value* 
15 Days - 30 Days & p-value* 
GI 
20.73 
0.0002 
41.46 0.0001 
26.15 0.0001 
30.06 0.0001 
52.76 0.0001 
32.46 0.0001 
BI 
24.14 0.0001 
44.83 0.0001 
27.27 0.0001 
28.03 0.0001 
64.02 0.0001 
50.00 0.0001 
PPD 
10.78 0.0033 
26.47 0.0001 
17.58 0.0010 
14.02 0.0007 
32.71 0.0001 
21.74 0.0001 
CAL 
17.74 0.0033 
43.55 0.0001 
31.37 0.0010 
37.31 0.0003 
52.24 0.0001 
23.81 0.0001 
[Table/Fig-2]: Comparison of clinical parameters in control and test sites at 
different time points 
[Table/Fig-3]: Percentage change in the clinical parameters in control and test 
sites at different time points 
* Comparison between groups (Mann-Whitney U test); p<0.05 
subgingival placement of Indian propolis. Clinical trial was registered at ClinicalTrial.gov and the number assigned was NCT01943877. 
Patients who presented with good general health and were diagnosed with chronic periodontitis having minimum of 20 natural teeth with at least one pocket per quadrant with a pocket probing depth (PPD) between 5 and 8 mm were included in the study. Smokers, pregnant and lactating mothers, patients with any other systemic disease like diabetes that can alter the course of periodontal disease progression and treatment were excluded. In every patient, the selected sites were marked and assigned randomly either to the control group or test group. A consort flowchart is presented as [Table/Fig-1]. 
After enrolment by a chief investigator (SPB), sites were randomly assigned to either test or control groups by a flip of a coin. All clinical measurements were performed by a single examiner (NS). On their first visit, all patients were examined in order to register the Gingival index (GI) (Silness and Loe, 1964), Sulcus bleeding Index (BI) (Muhlemann and Son, 1971), Probing pocket depth (PPD) and clinical attachment level (CAL) were measured at six sites per tooth. These parameters were reassessed at 15 days and one month after therapy. 
After baseline examination and plaque sample collections, test sites were treated with SRP followed by subgingival administration of propolis, which was preweighed (~5mg) and control sites were treated with SRP alone. 
MICROBIAL SAMPLING 
Supragingival plaque was gently removed with sterile cotton pellets and sample sites were isolated with cotton rolls and air-dried prior to sampling. At baseline (prior to SRP) and at 15 days and one month post-treatment, subgingival plaque samples were collected from the deepest portion of the pocket using sterile curettes from test and control sites. Subgingival specimens were collected with a single stroke after gentle insertion into the bottom of the sampling site. 
Samples collected in coded sterile vials containing thioglycollate broth were transported to the laboratory for microbial analysis. Once it was received in the laboratory, the sample was mixed thoroughly and was inoculated using sterile loop onto the following medium: Enriched Blood Agar (Porphyromonas gingivalis {Pg}), Brewer’s Anaerobic Agar (Fusobacterium nucleatum {Fn}) and Blood Agar (Prevotella intermedia {Pi}). 
TECHNIQUE FOR DRUG DELIVERY 
A plastic filling instrument was used to carry and place propolis into the test sites, after completion of SRP. The drug was placed such that it was not exposed to the oral cavity. Normal oral hygiene was observed. Patient was advised to avoid proximal cleaning until seven days after treatment of the test sites. Clinical parameters were assessed at 15 days and one month after treatment. 
STATISTICAL ANALYSIS 
Data analysis was performed using the patient as the experimental unit. The statistical analysis was done using SPSS version 15.0 statistical analysis software. The values were represented in number (%) and mean ± standard deviation (SD). The intragroup comparison was done using Wilcoxon’s signed rank test to evaluate the difference between two treatments or conditions where the samples were correlated and the intergroup comparison was done using the Mann-Whitney U-test to determine if a difference exists between two groups. In the present study p value less than 0.05 was considered as the significant. 
RESULTS 
Twenty sites were allocated to control group and 20 sites to test group. At no time did any patient experience adverse effects by the 
[Table/Fig-1]: Consort flowchart 
[Table/Fig-4]: Comparison of test and control groups with respect to probing 
pocket depth scores at baseline, 15 days and 30 days
www.jcdr.net Nehal N Sanghani et al., Propolis in the Treatment of Chronic Periodontitis 
Journal of Clinical and Diagnostic Research. 2014 Sep, Vol-8(9): ZC41-ZC44 
43 
Control Site (SRP 
T 
est Site (SRP + Propolis) 
Baseline (Mean 
+SD) 
15 DAYS (Mean 
+SD) 
1 Month (Mean 
+SD) 
Baseline (Mean 
+SD) 
15 DAYS (Mean 
+SD) 
1 MONTH (Mean 
+SD) 
*Pg 
43.30 
±11.65 
20.20 
± 9.31 
7.80 
±5.03 
43.55 
±13.74 
15.15 
±3.65 
4.90 
±3.35 
*Pi 
80.35 
±12.93 
45.90 
±14.85 
26.25 
±11.22 
63.75 
±13.36 
30.20 
±12.17 
15.15 
±5.47 
*Fn 
68.65 
±10.52 
50.50 
±18.70 
27.80 
±10.68 
64.00 
±9.55 
41.00 
±7.88 
19.85± 
6.80 
Clinical Data 
% Change at Control Sites (Srp) 
% Change at Test Sites 
(Srp + Propolis) 
Baseline- 15 Days 
& p-value* 
Baseline- 30 Days & p-value* 
15 Days - 30 Days & p-value* 
Baseline- 15 Days & p-value* 
Baseline- 30 Days & p-value* 
15 Days - 30 Days & p-value* 
*Pg 
53.35 0.00001 
81.99 0.00001 
61.39 0.00001 
65.21 0.00001 
88.75 0.00001 
67.66 0.00001 
*Pi 
42.87 0.00001 
67.33 0.00001 
42.81 0.00001 
52.63 0.00001 
76.24 0.00001 
49.83 0.00001 
*Fn 
26.44 0.0002 
59.50 0.00001 
44.95 0.00001 
35.94 0.00001 
68.98 0.00001 
51.59 0.00001 
[Table/Fig-5]: Comparison of prevalence of Porphyromonas gingivalis, Prevotella 
intermedia, Fusobacterium nucleatum different time points in test and control sites 
*Pg- Porphyromonas gingivalis; Pi- Prevotella intermedia; Fn- Fusobacterium 
nucleatum 
[Table/Fig-6]: The percentage of change of prevalence of Porphyromonas 
gingivalis, Prevotella intermedia, Fusobacterium nucleatum at different time points in 
test and control sites 
* Comparison between groups (Mann-Whitney U-test); *p < 0.05. 
†Pg- Porphyromonas gingivalis; Pi- Prevotella intermedia; Fn- Fusobacterium nucleatum 
use of propolis. No local allergic reaction, pain, swelling, or other side effects were observed throughout the study. 
Intragroup evaluation at different time intervals in the test group showed that all the changes were significant statistically at all the time intervals (p < 0.05). Evaluation of change at different time intervals in the control group also showed that the changes were significant statistically at all the time intervals (p < 0.05), as shown in [Table/Fig-2]. A comparison of the mean change in clinical parameters between baseline and one month revealed a statistically significant intergroup difference for all the parameters with the test group showing significantly higher change as compared to the control group (p < 0.05) as shown in [Table/Fig-2]. 
[Table/Fig-2] shows the mean GI, BI, PPD and CAL scores in both test and control sites at different points of time i.e. baseline, 15days and one month. Percentage change seen in clinical parameters in test and control sites at baseline, 15 days, one month is shown in [Table/Fig-3]. [Table/Fig-4] depicts the changes in the mean value of PPD at various points of time. 
MICROBIOLOGICAL ANALYSIS 
Subgingival plaque samples for microbiological analysis were taken at the test and control sites at baseline, 15 days and one month. Microbiological parameters included evaluation of reduction of the three periodontal pathogens at baseline, 15 days and one month follow-up visits. The quantities of colonies are expressed as colony forming units per ml (CFU/ml). [Table/Fig-5] shows the mean values of colony count/ml for Porphyromonas gingivalis (Pg), Prevotella intermedia (Pi) and Fusobacterium nucleatum (Fn) in test and control groups at different time intervals. At the follow-up intervals, an intragroup comparison revealed a statistically significant (p < 0.05) reduction in both the groups, with the test group showing lower prevalence of all the three microorganisms as compared to the control group. 
[Table/Fig-5] shows the mean values of the prevalence of Porphyromonas gingivalis (Pg), Prevotella intermedia (Pi), Fusobacterium nucleatum (Fn) at different time points (baseline, 15 days and one month) in test and control sites. The percentage change of prevalence of Pg, Pi, Fn at baseline, 15 days and one month is shown in [Table/Fig-6] for both test and control groups. 
Overall, both the groups showed statistically significant reduction in relation to the clinical parameters. Also, the groups showed reduction in the microbial count of Porphyromonas gingivalis, Prevotella intermedia and Fusobacterium nucleatum. 
DISCUSSION 
The aim of the present study was to compare the clinical and microbiological benefits of routine mechanical therapy with adjunctive use of Indian propolis as a local drug delivery (LDD) agent in the treatment of periodontitis. LDD agents are available for use as adjuncts to SRP. They reduce the subgingival bacterial flora and the clinical signs of periodontitis. LDD may be used as an adjunct to SRP when localised recurrent and/or residual probing depth of ≥ 5 mm with inflammation is still present after conventional therapies [18]. 
Complementary and alternative medicine (CAM) represents a group of diverse medical and health care systems, practices, and products that are not considered to be part of conventional medicine [19]. Biofeedback, acupuncture, herbal medication, massage, bioelectromagnetic therapy, meditation, and music therapy are examples of CAM treatments. Apitherapy, or therapy with bee products (e.g. honey, pollen, propolis, fortified honey, etc) is an old tradition that has been revitalized in recent research [20]. Natural products like propolis are preferred due to lesser side effects and lower cost. 
Propolis is highly regarded for its medicinal properties [7,11-17]. The antimicrobial properties of propolis against human pathogens have been known since antiquity [6]. Previously, Santos et al., Feres et al., and Koru et al., confirmed antibacterial properties of propolis in relation to pathogens of periodontitis [21-23]. Santos et al., also indicated that antibacterial effects are conditioned by flavonoids, phenol acids and their esters [21]. 
In the present study, the efficacy of propolis as a local drug delivery was evaluated over SRP alone for a period of one month. The clinical parameters were recorded at 1 month as the bacterial flora is known to return to pre-treatment patterns after 3-6 weeks of SRP [22]. 
Significant reduction in the GI was seen in the test group and the control group from baseline to 1 month with the test group showing significantly higher reduction (0.96±0.09) as compared to the control group (1.20±0.22) (p < 0.001). Similarly, a mean reduction in BI was significantly higher in the test group (1.53 ± 0.52) as compared to the control group (0.67 ± 0.41) (p < 0.001) as shown in [Table/ Fig-3]. These findings are probably justified by the antibacterial and anti-inflammatory effects of propolis. This is in correlation with a recent study in which propolis was used an alcohol-free mouthwash containing 5.0% (W/V) Brazilian green propolis for the control of plaque and gingivitis [14]. Twenty five participants were instructed to rinse with 10ml of mouthwash test for one minute, immediately after brushing in the morning and at night. After 45 and 90 days of using mouthwash, the results showed a significant reduction in plaque and in gingival index when compared to that at baseline [14]. 
Research done by Coutinho made it possible to conclude that additional subgingival irrigation with a propolis extract during periodontal treatment allowed to obtain better results than SRP by themselves, which results from the assessment of both clinical and microbiological parameters [15]. The results of our study correlated with the aforementioned research. 
At baseline, the majority of the evaluated sites exhibited high levels of P gingivalis, P intermedia and F nucleatum. The use of propolis in test sites showed significant reduction in the prevalence of the three pathogens. Some in vitro and in vivo studies have demonstrated activity of propolis against periodontal pathogens [7,17,21-24,25-
Nehal N Sanghani et al., Propolis in the Treatment of Chronic Periodontitis www.jcdr.net 
44 Journal of Clinical and Diagnostic Research. 2014 Sep, Vol-8(9): ZC41-ZC44 
28]. Mechanisms of activity of propolis against microorganisms are 
still controversial. Some components present in propolis extracts 
like flavonoids (quercetin, galangin, pinocembrin) and caffeic acid, 
benzoic acid, cinnamic acid, probably act on the microbial membrane 
or cell wall site, causing functional and structural damages [27]. 
Propolis has anti-inflammatory effects and it acts by modulating the 
cytokines and inflammatory mediators, such as suppression in the 
production of prostaglandins, histamine, TGF-β [17]. The results of 
use of propolis on the severity of gingival and bleeding indices scores 
suggest their anti-inflammatory effects [16]. Evidence suggests 
that propolis may actively protect against oral disease due to its 
antimicrobial properties [17,28]. Because of its strong, anti-infective 
activity, propolis has often been called a “natural antibiotic.” 
There was no adverse effect seen in any of the patients treated with 
propolis in the present study. The varied benefits of propolis, such 
as affordability, easy availability, antibacterial and antiinflammatory 
properties make propolis a potential therapeutic agent in periodontal 
therapy. The limitations of the present study include larger sample 
size, use of more sensitive microbiological analysis techniques like 
polymerase chain reaction. 
CONCLUSION 
Our study demonstrated reduction of GI, BI, PPD, CAL in the test 
group treated with scaling and root planing and propolis when 
compared to the control sites treated with SRP alone. Subgingivally 
delivered propolis as an adjunct to scaling and root planing 
in the treatment of chronic periodontitis has shown promising 
results. Further research focussing on the in vivo and in vitro anti-inflammatory/ 
antimicrobial effects of propolis done on larger sample 
size is required for the better understanding of its precise role in 
the treatment of periodontitis. It is therefore comprehensible that 
we should now focus on “back to nature approach” where propolis 
seems to be a promising alternative for the control of oral diseases 
in terms of antimicrobial properties and lower associated risks. 
ACKNOWLEDGEMENTS 
The authors thank Hi- Tech Chemicals Limited, Delhi for providing 
Indian Propolis extract. We would also like to thank Dr. Kishore 
Bhat, M.D, HOD, Department of Microbiology for helping us with the 
microbiological analysis. The authors report no conflicts of interest 
related to this study. 
REFERENCES 
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[15] Coutinho A. Honeybee propolis extract in periodontal treatment. A clinical and 
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[17] Elaine Gebara, Luiz Lima, Marci Mayer. Propolis antimicrobial activity against 
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[19] Little JW. Complementary and alternative medicine: impact on dentistry. Oral 
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[21] Santos FA, Bastos, Uzeda M, et al. Antibacterial activity of Brazilian propolis and 
fractions against oral anaerobic bacteria. J Ethnopharmacol. 2002;80:1–7. 
[22] Feres M, Figueiredo LC, Barreto IM, Coelho MH, Araujo MW, Cortelli SC. In vitro 
antimicrobial activity of plant extracts and propolis in saliva samples of healthy 
and periodontally-involved subjects. J Int Acad Periodontol. 2005;7:90–96. 
[23] Koru O, Toksoy F, Acikel CH, et al. In vitro antimicrobial activity of propolis 
samples from different geographical origins against certain oral pathogens. 
Anaerobe. 2007; 13:140–45. 
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Dent Clin North Am. 2005;49:611-36. 
[25] Dodwad V, Kukreja BJ. Propolis mouthwash: A new beginning. J Indian Soc 
Periodontol. 2011;15:121–25. 
[26] Sonmez S, Kirilmaz L,Yucesoy M, Yilmaz B. The effect of bee propolis on oral 
pathogens and human gingival fibroblasts. J Ethnopharmaco. 2005;102:371-76. 
[27] Mirzoeva OK, Grishanin RN, Calder PC. Antimicrobial action of propolis and 
some of its components: the effects on growth, membrane potential and motility 
of bacteria. Microbiol Res. 1997;152:239-46. 
[28] Gomez RT, Teixeira KR, Cortes ME, Santos VR. Antimicrobial Activity of a propolis 
adhesive formulation on different oral pathogens. Braz J Oral Sci. 2007;6:1387-91. 
PARTICULARS OF CONTRIBUTORS: 
1. Post-graduate student, Department of Periodontology, Rajarajeswari Dental College and Hospital, Bangalore, India. 
2. Reader, Department of Periodontology, Rajarajeswari Dental College and Hospital, Bangalore, India. 
3. Principal and Head of Department, Department of Periodontology, Rajarajeswari Dental College and Hospital, Bangalore, India. 
NAME, ADRESS, E-MAIL ID OF THE CORRESPONDING AUTHOR: 
Dr. Shivaprasad BM, 
PG Guide, Reader, Department of Periodontology, Rajarajeswari Dental College and Hospital, 
No. 14, Ramohalli Cross, Kumbalgodu, Mysore Road, Bangalore - 560 060, India. 
E-mail : drshivaprasad2000@rediffmail.com 
Financial OR OTHER COMPETING INTERESTS: None. 
Date of Submission: Feb 06, 2014 
Date of Peer Review: Apr 28, 2014 
Date of Acceptance: Jun 19, 2014 
Date of Publishing: Sep 20, 2014

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Propolis as an adjuvant in the treatment of Chronic Periodontitis

  • 1. Journal of Clinical and Diagnostic Research. 2014 Sep, Vol-8(9): ZC41-ZC44 41 DOI: 10.7860/JCDR/2014/8817.4856 Original Article Chronic periodontitis, Drug delivery, Porphyromonas gingivalis, Propolis Nehal N Sanghani1, Shivaprasad BM2, savita S3 INTRODUCTION Periodontitis has multifactorial aetiology with the primary aetiologic agents being pathogenic bacteria that reside in the subgingival area and possess potent mechanisms of damaging host defences. Inflammatory responses triggered in response to periodontal pathogens are the major events responsible for periodontal destruction [1,2]. Treatment of periodontal disease is directed towards the suppression /elimination of subgingival microflora. Root debridement performed by mechanical means, i.e., scaling and root planing (SRP), is the most commonly used initial treatment approach [3]. However, comprehensive mechanical debridement of sites with deep periodontal pockets is difficult to accomplish. It alone, may fail to eliminate the pathogenic microflora because of their location within the gingiva or in areas inaccessible to periodontal instruments [3]. In view of the complex ecosystem within the subgingival pocket, the adjunctive use of antimicrobial agents have been advocated along with mechanical instrumentation to minimize the need for surgical treatment of pockets [4]. Local antimicrobial therapy has the advantage of providing effective concentration of the drug at the site of infection with minimal systemic load and low risk for the emergence of bacterial resistance [3-5]. The clinical use of antibiotics and other antimicrobial agents, as adjuvants for the treatment of periodontitis, has been extensively investigated [4-6]. Recently, special attention has been paid to natural medication, and Indian propolis is one of them which has drawn the attention over a long period of time [7-9]. Propolis is the generic name for a complex resinous mixture collected by honey bees from the buds and exudates of various plants [9]. Once collected, this material is enriched with saliva and enzyme- containing secretions and used in the construction, adaptation, and protection of hives [9]. The medicinal properties of propolis have been investigated previously [10,11]. Contemporary research involving propolis highlights its antimicrobial [6] and anti-inflammatory activities [11]. Anti-inflammatory property of propolis is due to the presence of caffeic acid phenethyl ester D entistry Section Health from the Hive: Propolis as an Adjuvant in the Treatment of Chronic Periodontitis - A Clinicomicrobiologic Study ABSTRACT Objectives: This study was aimed at the clinical and microbiological evaluation of the efficacy of subgingivally delivered Indian propolis extract as an adjunct to scaling and root planing (SRP) in the treatment of periodontitis. Materials and Methods: Twenty patients diagnosed with chronic periodontitis presenting a minimum of two pockets (probing depth ≥5 mm) were selected. Sites were assigned randomly into control sites (n=20) which received SRP alone or test sites (n=20) which received SRP and locally delivered propolis. At selected sites, the clinical parameters were assessed and subgingival plaque samples were collected at baseline, 15 days and one month. The samples were cultured anerobically for periodontal pathogens. Results: The results indicated that there was a significant improvement in both clinical and microbiological parameters (p<0.01) in the test sites compared to the control sites at the end of the study. Conclusion: Subgingival delivery of propolis showed promising results as an adjunct to SRP in patients with chronic periodontitis when assessed by clinical and microbiological parameters. (CAPE) in propolis. Flavonoids and cinnamic acid derivatives have been considered as the main biologically active components in propolis [11]. Propolis has been used for the treatment of aphthous ulcers [12], candidiasis [13], gingivitis [14], periodontitis [15], and pulpitis [16]. Studies on propolis applications have increased because of its therapeutic and biological properties. A study evaluated the antibacterial action of propolis against certain anaerobic oral pathogens and found it to be very effective against Peptostreptococcus anaerobius, Lactobacillus acidophilus, Actinomyces naeslundii, Prevotella oralis, Prevotella melaninogenica, Porphyromonas gingivalis, Fusobacterium nucleatum and Veillonella parvula [17]. Recently, a study was conducted to explore the clinical and microbiological efficacy of propolis extract as a subgingival irrigant in periodontal treatment. It was concluded that subgingival irrigation with propolis extract can be considered as an adjuvant to SRP [15]. However, the effect of propolis as a local drug delivery agent in treatment of chronic periodontitis, in relation to the clinical and microbiological parameters has not been studied till date, according to the best of our knowledge. Hence, the present study was aimed at clinical and microbiological evaluation of the efficacy of subgingivally delivered Indian propolis extract as an adjunct to SRP in the treatment of periodontitis. MATERIALS AND METHODS The randomized, controlled, parallel, double-blind study (clinician and microbiologist) was conducted at Department of Periodontics, Rajarajeswari Dental College and Hospital, Bangalore, India. Twenty patients, 9 males and 11 females, Aged 25 to 50 years (mean age, 35.6 ± 12.2 y) were included in the study after performing the power analysis. The study was conducted from December 2012 to August 2013. Prior to the execution of the treatment, written informed consent was obtained and the treatment procedure was explained to the patient. Ethical clearance was obtained from Institutional Ethical Committee Review Board. The treatment comprised of two groups. Control group, in which the sites were treated by SRP alone and in the test group, the sites were treated by SRP followed by
  • 2. Nehal N Sanghani et al., Propolis in the Treatment of Chronic Periodontitis www.jcdr.net Journal of Clinical and Diagnostic Research. 2014 Sep, Vol-8(9): ZC41-ZC44 42 Control Site (SRP) T est Site (SRP + Propolis) Baseline (Mean +SD) 15 DAYS (Mean +SD) 1 Month (Mean +SD) Baseline (Mean +SD) 15 DAYS (Mean +SD) 1 MONTH (Mean +SD) Mean GI 2.05+0.32 1.63+0.17 1.20+0.22 2.04+0.26 1.43+0.16 0.96+0.09 Mean BI 2.90+0.45 2.20+0.22 1.60+0.21 2.99+0.32 2.15+0.22 1.08+0.23 Mean PPD 5.10+0.55 4.55+0.83 3.75+0.79 5.35+0.67 4.60+0.68 3.60+0.68 Mean CAL 3.10+0.55 2.55+0.83 1.75+0.79 3.35+0.67 2.10+0.79 1.60+0.68 Clinical Data % Change at Control Sites (Srp) % Change at Test Sites (Srp + Propolis) Baseline- 15 Days & p-value* Baseline- 30 Days & p-value* 15 Days - 30 Days & p-value* Baseline- 15 Days & p-value* Baseline- 30 Days & p-value* 15 Days - 30 Days & p-value* GI 20.73 0.0002 41.46 0.0001 26.15 0.0001 30.06 0.0001 52.76 0.0001 32.46 0.0001 BI 24.14 0.0001 44.83 0.0001 27.27 0.0001 28.03 0.0001 64.02 0.0001 50.00 0.0001 PPD 10.78 0.0033 26.47 0.0001 17.58 0.0010 14.02 0.0007 32.71 0.0001 21.74 0.0001 CAL 17.74 0.0033 43.55 0.0001 31.37 0.0010 37.31 0.0003 52.24 0.0001 23.81 0.0001 [Table/Fig-2]: Comparison of clinical parameters in control and test sites at different time points [Table/Fig-3]: Percentage change in the clinical parameters in control and test sites at different time points * Comparison between groups (Mann-Whitney U test); p<0.05 subgingival placement of Indian propolis. Clinical trial was registered at ClinicalTrial.gov and the number assigned was NCT01943877. Patients who presented with good general health and were diagnosed with chronic periodontitis having minimum of 20 natural teeth with at least one pocket per quadrant with a pocket probing depth (PPD) between 5 and 8 mm were included in the study. Smokers, pregnant and lactating mothers, patients with any other systemic disease like diabetes that can alter the course of periodontal disease progression and treatment were excluded. In every patient, the selected sites were marked and assigned randomly either to the control group or test group. A consort flowchart is presented as [Table/Fig-1]. After enrolment by a chief investigator (SPB), sites were randomly assigned to either test or control groups by a flip of a coin. All clinical measurements were performed by a single examiner (NS). On their first visit, all patients were examined in order to register the Gingival index (GI) (Silness and Loe, 1964), Sulcus bleeding Index (BI) (Muhlemann and Son, 1971), Probing pocket depth (PPD) and clinical attachment level (CAL) were measured at six sites per tooth. These parameters were reassessed at 15 days and one month after therapy. After baseline examination and plaque sample collections, test sites were treated with SRP followed by subgingival administration of propolis, which was preweighed (~5mg) and control sites were treated with SRP alone. MICROBIAL SAMPLING Supragingival plaque was gently removed with sterile cotton pellets and sample sites were isolated with cotton rolls and air-dried prior to sampling. At baseline (prior to SRP) and at 15 days and one month post-treatment, subgingival plaque samples were collected from the deepest portion of the pocket using sterile curettes from test and control sites. Subgingival specimens were collected with a single stroke after gentle insertion into the bottom of the sampling site. Samples collected in coded sterile vials containing thioglycollate broth were transported to the laboratory for microbial analysis. Once it was received in the laboratory, the sample was mixed thoroughly and was inoculated using sterile loop onto the following medium: Enriched Blood Agar (Porphyromonas gingivalis {Pg}), Brewer’s Anaerobic Agar (Fusobacterium nucleatum {Fn}) and Blood Agar (Prevotella intermedia {Pi}). TECHNIQUE FOR DRUG DELIVERY A plastic filling instrument was used to carry and place propolis into the test sites, after completion of SRP. The drug was placed such that it was not exposed to the oral cavity. Normal oral hygiene was observed. Patient was advised to avoid proximal cleaning until seven days after treatment of the test sites. Clinical parameters were assessed at 15 days and one month after treatment. STATISTICAL ANALYSIS Data analysis was performed using the patient as the experimental unit. The statistical analysis was done using SPSS version 15.0 statistical analysis software. The values were represented in number (%) and mean ± standard deviation (SD). The intragroup comparison was done using Wilcoxon’s signed rank test to evaluate the difference between two treatments or conditions where the samples were correlated and the intergroup comparison was done using the Mann-Whitney U-test to determine if a difference exists between two groups. In the present study p value less than 0.05 was considered as the significant. RESULTS Twenty sites were allocated to control group and 20 sites to test group. At no time did any patient experience adverse effects by the [Table/Fig-1]: Consort flowchart [Table/Fig-4]: Comparison of test and control groups with respect to probing pocket depth scores at baseline, 15 days and 30 days
  • 3. www.jcdr.net Nehal N Sanghani et al., Propolis in the Treatment of Chronic Periodontitis Journal of Clinical and Diagnostic Research. 2014 Sep, Vol-8(9): ZC41-ZC44 43 Control Site (SRP T est Site (SRP + Propolis) Baseline (Mean +SD) 15 DAYS (Mean +SD) 1 Month (Mean +SD) Baseline (Mean +SD) 15 DAYS (Mean +SD) 1 MONTH (Mean +SD) *Pg 43.30 ±11.65 20.20 ± 9.31 7.80 ±5.03 43.55 ±13.74 15.15 ±3.65 4.90 ±3.35 *Pi 80.35 ±12.93 45.90 ±14.85 26.25 ±11.22 63.75 ±13.36 30.20 ±12.17 15.15 ±5.47 *Fn 68.65 ±10.52 50.50 ±18.70 27.80 ±10.68 64.00 ±9.55 41.00 ±7.88 19.85± 6.80 Clinical Data % Change at Control Sites (Srp) % Change at Test Sites (Srp + Propolis) Baseline- 15 Days & p-value* Baseline- 30 Days & p-value* 15 Days - 30 Days & p-value* Baseline- 15 Days & p-value* Baseline- 30 Days & p-value* 15 Days - 30 Days & p-value* *Pg 53.35 0.00001 81.99 0.00001 61.39 0.00001 65.21 0.00001 88.75 0.00001 67.66 0.00001 *Pi 42.87 0.00001 67.33 0.00001 42.81 0.00001 52.63 0.00001 76.24 0.00001 49.83 0.00001 *Fn 26.44 0.0002 59.50 0.00001 44.95 0.00001 35.94 0.00001 68.98 0.00001 51.59 0.00001 [Table/Fig-5]: Comparison of prevalence of Porphyromonas gingivalis, Prevotella intermedia, Fusobacterium nucleatum different time points in test and control sites *Pg- Porphyromonas gingivalis; Pi- Prevotella intermedia; Fn- Fusobacterium nucleatum [Table/Fig-6]: The percentage of change of prevalence of Porphyromonas gingivalis, Prevotella intermedia, Fusobacterium nucleatum at different time points in test and control sites * Comparison between groups (Mann-Whitney U-test); *p < 0.05. †Pg- Porphyromonas gingivalis; Pi- Prevotella intermedia; Fn- Fusobacterium nucleatum use of propolis. No local allergic reaction, pain, swelling, or other side effects were observed throughout the study. Intragroup evaluation at different time intervals in the test group showed that all the changes were significant statistically at all the time intervals (p < 0.05). Evaluation of change at different time intervals in the control group also showed that the changes were significant statistically at all the time intervals (p < 0.05), as shown in [Table/Fig-2]. A comparison of the mean change in clinical parameters between baseline and one month revealed a statistically significant intergroup difference for all the parameters with the test group showing significantly higher change as compared to the control group (p < 0.05) as shown in [Table/Fig-2]. [Table/Fig-2] shows the mean GI, BI, PPD and CAL scores in both test and control sites at different points of time i.e. baseline, 15days and one month. Percentage change seen in clinical parameters in test and control sites at baseline, 15 days, one month is shown in [Table/Fig-3]. [Table/Fig-4] depicts the changes in the mean value of PPD at various points of time. MICROBIOLOGICAL ANALYSIS Subgingival plaque samples for microbiological analysis were taken at the test and control sites at baseline, 15 days and one month. Microbiological parameters included evaluation of reduction of the three periodontal pathogens at baseline, 15 days and one month follow-up visits. The quantities of colonies are expressed as colony forming units per ml (CFU/ml). [Table/Fig-5] shows the mean values of colony count/ml for Porphyromonas gingivalis (Pg), Prevotella intermedia (Pi) and Fusobacterium nucleatum (Fn) in test and control groups at different time intervals. At the follow-up intervals, an intragroup comparison revealed a statistically significant (p < 0.05) reduction in both the groups, with the test group showing lower prevalence of all the three microorganisms as compared to the control group. [Table/Fig-5] shows the mean values of the prevalence of Porphyromonas gingivalis (Pg), Prevotella intermedia (Pi), Fusobacterium nucleatum (Fn) at different time points (baseline, 15 days and one month) in test and control sites. The percentage change of prevalence of Pg, Pi, Fn at baseline, 15 days and one month is shown in [Table/Fig-6] for both test and control groups. Overall, both the groups showed statistically significant reduction in relation to the clinical parameters. Also, the groups showed reduction in the microbial count of Porphyromonas gingivalis, Prevotella intermedia and Fusobacterium nucleatum. DISCUSSION The aim of the present study was to compare the clinical and microbiological benefits of routine mechanical therapy with adjunctive use of Indian propolis as a local drug delivery (LDD) agent in the treatment of periodontitis. LDD agents are available for use as adjuncts to SRP. They reduce the subgingival bacterial flora and the clinical signs of periodontitis. LDD may be used as an adjunct to SRP when localised recurrent and/or residual probing depth of ≥ 5 mm with inflammation is still present after conventional therapies [18]. Complementary and alternative medicine (CAM) represents a group of diverse medical and health care systems, practices, and products that are not considered to be part of conventional medicine [19]. Biofeedback, acupuncture, herbal medication, massage, bioelectromagnetic therapy, meditation, and music therapy are examples of CAM treatments. Apitherapy, or therapy with bee products (e.g. honey, pollen, propolis, fortified honey, etc) is an old tradition that has been revitalized in recent research [20]. Natural products like propolis are preferred due to lesser side effects and lower cost. Propolis is highly regarded for its medicinal properties [7,11-17]. The antimicrobial properties of propolis against human pathogens have been known since antiquity [6]. Previously, Santos et al., Feres et al., and Koru et al., confirmed antibacterial properties of propolis in relation to pathogens of periodontitis [21-23]. Santos et al., also indicated that antibacterial effects are conditioned by flavonoids, phenol acids and their esters [21]. In the present study, the efficacy of propolis as a local drug delivery was evaluated over SRP alone for a period of one month. The clinical parameters were recorded at 1 month as the bacterial flora is known to return to pre-treatment patterns after 3-6 weeks of SRP [22]. Significant reduction in the GI was seen in the test group and the control group from baseline to 1 month with the test group showing significantly higher reduction (0.96±0.09) as compared to the control group (1.20±0.22) (p < 0.001). Similarly, a mean reduction in BI was significantly higher in the test group (1.53 ± 0.52) as compared to the control group (0.67 ± 0.41) (p < 0.001) as shown in [Table/ Fig-3]. These findings are probably justified by the antibacterial and anti-inflammatory effects of propolis. This is in correlation with a recent study in which propolis was used an alcohol-free mouthwash containing 5.0% (W/V) Brazilian green propolis for the control of plaque and gingivitis [14]. Twenty five participants were instructed to rinse with 10ml of mouthwash test for one minute, immediately after brushing in the morning and at night. After 45 and 90 days of using mouthwash, the results showed a significant reduction in plaque and in gingival index when compared to that at baseline [14]. Research done by Coutinho made it possible to conclude that additional subgingival irrigation with a propolis extract during periodontal treatment allowed to obtain better results than SRP by themselves, which results from the assessment of both clinical and microbiological parameters [15]. The results of our study correlated with the aforementioned research. At baseline, the majority of the evaluated sites exhibited high levels of P gingivalis, P intermedia and F nucleatum. The use of propolis in test sites showed significant reduction in the prevalence of the three pathogens. Some in vitro and in vivo studies have demonstrated activity of propolis against periodontal pathogens [7,17,21-24,25-
  • 4. Nehal N Sanghani et al., Propolis in the Treatment of Chronic Periodontitis www.jcdr.net 44 Journal of Clinical and Diagnostic Research. 2014 Sep, Vol-8(9): ZC41-ZC44 28]. Mechanisms of activity of propolis against microorganisms are still controversial. Some components present in propolis extracts like flavonoids (quercetin, galangin, pinocembrin) and caffeic acid, benzoic acid, cinnamic acid, probably act on the microbial membrane or cell wall site, causing functional and structural damages [27]. Propolis has anti-inflammatory effects and it acts by modulating the cytokines and inflammatory mediators, such as suppression in the production of prostaglandins, histamine, TGF-β [17]. The results of use of propolis on the severity of gingival and bleeding indices scores suggest their anti-inflammatory effects [16]. Evidence suggests that propolis may actively protect against oral disease due to its antimicrobial properties [17,28]. Because of its strong, anti-infective activity, propolis has often been called a “natural antibiotic.” There was no adverse effect seen in any of the patients treated with propolis in the present study. The varied benefits of propolis, such as affordability, easy availability, antibacterial and antiinflammatory properties make propolis a potential therapeutic agent in periodontal therapy. The limitations of the present study include larger sample size, use of more sensitive microbiological analysis techniques like polymerase chain reaction. CONCLUSION Our study demonstrated reduction of GI, BI, PPD, CAL in the test group treated with scaling and root planing and propolis when compared to the control sites treated with SRP alone. Subgingivally delivered propolis as an adjunct to scaling and root planing in the treatment of chronic periodontitis has shown promising results. Further research focussing on the in vivo and in vitro anti-inflammatory/ antimicrobial effects of propolis done on larger sample size is required for the better understanding of its precise role in the treatment of periodontitis. It is therefore comprehensible that we should now focus on “back to nature approach” where propolis seems to be a promising alternative for the control of oral diseases in terms of antimicrobial properties and lower associated risks. ACKNOWLEDGEMENTS The authors thank Hi- Tech Chemicals Limited, Delhi for providing Indian Propolis extract. We would also like to thank Dr. Kishore Bhat, M.D, HOD, Department of Microbiology for helping us with the microbiological analysis. The authors report no conflicts of interest related to this study. REFERENCES [1] Darveau RP, Tanner A, Page RC. The microbial challenge in periodontitis. Periodontol. 2000. 1997;14:12–32. [2] Amano A. Disruption of epithelial barrier and impairment of cellular function by Porphyromonas gingivalis. Front Biosci. 2007;12:3965–74. [3] Herrera D, Sanz M, Jepsen S, Needleman I, Roldan S. A systematic review on the effect of systemic antimicrobials as an adjunct to scaling and root planing in periodontitis patients. J Clin Periodontol. 2002;29:136–59. [4] Van Winkelhoff AJ, Gonzales DH, Winkel EG, Dellemijn-Kippuw N, Vandenbroucke- Grauls CMJE, Sanz M. Antimicrobial resistance in the subgingival microflora in patients with adult periodontitis. J Clin Periodontol. 2000;27:79–86. [5] Walker CB, Godowski KC, Borden L, et al. The effects of sustained release doxycycline on the anaerobic flora and antibiotic-resistant patterns in subgingival plaque and saliva. J Periodontol. 2000;71:768-74. [6] Gebara ECE, Lima Luiz A, Mayer Marcia PA. Propolis antimicrobial activity against periodontopathic bacteria. Braz J Microbiol. 2002; 33(4): 365- 369. [7] Castaldo S, Capasso. Propolis, an old remedy used in modern medicine. Fitoterapia. 2002;73:S1–6. [8] Maya Mhaske, Baig Nazish Samad, Rashmi Jawade and Ashok Bhansali. Chemical agents in control of dental plaque in dentistry: An overview of current knowledge and future challenges. Adv Appl Sci Res. 2012;3(1):268-72. [9] Palombo EA. Traditional medicinal plant extracts and natural products with activity against oral bacteria: potential application in the prevention and treatment of oral diseases. Evid Based Complement Alternat Med. 2011:680354. [10] Sardana D, InduShekar K, Manchanda S, Saraf BG and Sheoran N. Role of propolis in dentistry: review of the literature. Focus on Alternative and Complementary Therapies. 2013;18:118–25. [11] Borrelli F, Maffia P, Pinto L, Ianaro A, Russo A, Capasso F, et al. Phytochemical compounds involved in the anti-inflammatory effect of propolis extract. Fitoterapia. 2002;73:53-63. [12] Samet N, Laurent C, Susarla SM, Samet-Rubinsteen N. The effect of bee propolis on recurrent aphthous stomatitis: a pilot study. Clin Oral Investig. 2007;11:143-47. [13] Santos VR, Pimenta FJ, Aguiar MC, do Carmo MA, Naves MD, Mesquita RA. Oral Candidiasis treatment with Brazilian ethanol propolis extract. Phytother Res. 2005; 19:652-54. [14] Pereira EM, de Silva JL, Silva FF, et al. Clinical evidence of the efficacy of a mouthwash containing propolis for the control of plaque and gingivitis: a phase II study. Evid Based Complement Alternat Med. 2011:750249. [15] Coutinho A. Honeybee propolis extract in periodontal treatment. A clinical and microbiological study of propolis in periodontal treatment. Indian J Dent Res. 2012; 23:294-99. [16] Parolia A, Kundabala M, Rao NN, et al. A comparative histological analysis of human pulp following direct pulp capping with Propolis, mineral trioxide aggregate and Dycal. Aust Dent J. 2010;55:59–64. [17] Elaine Gebara, Luiz Lima, Marci Mayer. Propolis antimicrobial activity against periodontopathic bacteria. Braz J Microbiol. 2002;33:365-69. [18] American Academy of Periodontology Statement on local delivery of sustained or controlled release of antimicrobials as adjunctive therapy in the treatment of periodontitis. J Periodontol. 2006;77:1458-1458. [19] Little JW. Complementary and alternative medicine: impact on dentistry. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2004;98:137-45. [20] Ahuja V, Ahuja A. Apitherapy - A sweet approach to dental diseases. Part II: Propolis. J Acad Adv Dent Res. 2011;2:1-8. [21] Santos FA, Bastos, Uzeda M, et al. Antibacterial activity of Brazilian propolis and fractions against oral anaerobic bacteria. J Ethnopharmacol. 2002;80:1–7. [22] Feres M, Figueiredo LC, Barreto IM, Coelho MH, Araujo MW, Cortelli SC. In vitro antimicrobial activity of plant extracts and propolis in saliva samples of healthy and periodontally-involved subjects. J Int Acad Periodontol. 2005;7:90–96. [23] Koru O, Toksoy F, Acikel CH, et al. In vitro antimicrobial activity of propolis samples from different geographical origins against certain oral pathogens. Anaerobe. 2007; 13:140–45. [24] Ryan ME. Nonsurgical approaches for the treatment of periodontal diseases. Dent Clin North Am. 2005;49:611-36. [25] Dodwad V, Kukreja BJ. Propolis mouthwash: A new beginning. J Indian Soc Periodontol. 2011;15:121–25. [26] Sonmez S, Kirilmaz L,Yucesoy M, Yilmaz B. The effect of bee propolis on oral pathogens and human gingival fibroblasts. J Ethnopharmaco. 2005;102:371-76. [27] Mirzoeva OK, Grishanin RN, Calder PC. Antimicrobial action of propolis and some of its components: the effects on growth, membrane potential and motility of bacteria. Microbiol Res. 1997;152:239-46. [28] Gomez RT, Teixeira KR, Cortes ME, Santos VR. Antimicrobial Activity of a propolis adhesive formulation on different oral pathogens. Braz J Oral Sci. 2007;6:1387-91. PARTICULARS OF CONTRIBUTORS: 1. Post-graduate student, Department of Periodontology, Rajarajeswari Dental College and Hospital, Bangalore, India. 2. Reader, Department of Periodontology, Rajarajeswari Dental College and Hospital, Bangalore, India. 3. Principal and Head of Department, Department of Periodontology, Rajarajeswari Dental College and Hospital, Bangalore, India. NAME, ADRESS, E-MAIL ID OF THE CORRESPONDING AUTHOR: Dr. Shivaprasad BM, PG Guide, Reader, Department of Periodontology, Rajarajeswari Dental College and Hospital, No. 14, Ramohalli Cross, Kumbalgodu, Mysore Road, Bangalore - 560 060, India. E-mail : drshivaprasad2000@rediffmail.com Financial OR OTHER COMPETING INTERESTS: None. Date of Submission: Feb 06, 2014 Date of Peer Review: Apr 28, 2014 Date of Acceptance: Jun 19, 2014 Date of Publishing: Sep 20, 2014