Root Canal Preparation Techniques

1. ROOT CANAL PREPARATION
TECHNIQUES
PRESENTED BY
DR FASAHAT AHMED BUTT

2. CONTENTS
• OVERVIEW OF ROOT CANAL TREATMENT
• OBJECTIVES OF ROOT CANAL PREPARATIONS
• TYPES OF PREPARATIONS
• FILING TECHNIQUES

3. Access cavity
preparation
Working length
Initial filing
Cleaning &
shaping
Obturation
Core buildup

4. OBJECTIVES
BIOLOGICAL
COMPLETE REMOVAL OF
• PULPAL TISSUE
• BACTERIA
MECHANICAL
• CONTINUOUSLY TAPERING
PREPARATION
• MAINTAINING ORIGINAL
ANATOMY
• MAINTAINING POSITION OF
APICAL FORAMEN
• NARROW APEX

6. RECAPITULATION

7. TYPES OF ROOT CANAL PREPARATIONS
• CROWN DOWN
• STEP BACK
• HYBRID

8. CROWN DOWN
Caries removal &
access cavity
GG drills
WL#15 k file
Smaller file inserted
& repeated until
working length is
reached
Watch windingLarger file inserted

10. ADVANTAGES
• ELIMINATES CORONAL INTERFERENCES
• EASY ACCESS
• IMPROVED DISTRIBUTION OF IRRIGANT
• FACILITATES REMOVAL OF DEBRIS
• REDUCES CHANGE IN WL DURING APICAL PREPARATION

11. DISADVANTAGES
• INCREASED REMOVAL OF TOOTH STRUCTURE

12. STEP BACK

14. ADVANTAGES
• APICAL PREPARATION KEPT SMALL
• REDUCES PROCEDURAL ERRORS
• IMPROVES DEBRIDEMENT
• SMALLER FLEXIBLE INSTRUMENTS ARE USED IN THE APICAL REGION
WHILE LARGER USED SHORT OF THE APEX

15. DISADVANTAGES
• BLOCKAGE OF THE CANAL MAY OCCUR
• IRRIGATION CAN BE DIFICULT
• RISK OF DEBRIS EXTRUSION
• ALTERATION IN WORKING LENGTH

17. ADVANTAGES
• IT PERMITS CANAL MORPHOLOGY TO DICTATE PREPARATION SHAPE
• DOES NOT REQUIRE FORCING OF FILES INTO CANAL THAT CANNOT
ACCOMMODATE THEM
• MINOR CANAL OBTURATION
• SLIGHT ENLARGEMENT OF THE CANAL IN APICAL TO CORONAL DIRECTION

18. HYBRID TECHNIQUE
Canal
negotiation
Apical clearing
WL
determination
MAF
determination
Straight line
access
Rotary preparation of
the middle one thirds
of the root
Apical step back

19. ADVANTAGES
• LESS CHANCES OF LEDGE FORMATION

20. FILING TECHNIQUES
• WATCH WINDING
• REAMING
• FILING
• CIRCUMFERENTIAL FILING
• ANTICURVATURE
• BALANCED FORCE TECHNIQUE

21. WATCH WINDING

22. REAMING

23. FILING

24. CIRCUMFERENTIAL FILING

25. ANTICURVATURE FILING

26. BALANCED FORCE TECHNIQUE

27. REFERENCES
• TORABINEJAD
• COHEN’S PATHWAY OF PULP
• GOOGLE

28. THANK YOU