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2. Introduction
• Crossbites are term used to describe
abnormal occlusion in transverse plane. The
term is also used to describe reverse overjet
of one or more anterior teeth.
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3. Definition
• GRABER has defined cross bites as a
condition where one or more teeth may be
abnormally malposed buccally or lingually
or labially with reference to opposing tooth
or teeth.
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4. Classification.
• Based on their location as:
Anterior :single tooth or segmental
Posterior:unilateral or bilateral
• Based on the nature of the cross bites
Skeletal
Dental
Functional
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5. Etiology
• Persistance of a deciduous tooth
• Crowding or abnormal displacement of one
or more teeth
• Retarded development of maxilla in sagittal
as well as traneverse direction
• Narrow upper arch
• Collapse of the upper arch
• Unilateral hypo or hyper plastic growth of
any jaws
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6. Contd
• Sagittal discrepancies of the jaws such as
forwardly positioned mandible.
• Presence of habits such as thumb sucking
and mouth breathing can cause lowered
tongue position.
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7. Classification by the
characteristics of mal occlusion
• Evaluation of facial proportion &esthetics
• Evaluation of allignment &symmetry
• Evaluation of skeletal&dental relationship
in the transverse plane of space.
• Evaluation of skeletal&dental in the
anterior plane of space
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8. Management
• Management of dental cross bite
• management of skeletal cross bite
• DENTAL CROSS BITE management in
• primary dentition
• early mixed dentition
• late mixed dentition
• permanentdentition
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9. Management
• SKELETAL COSS BITE management in
• pre adolescent children-primary &early
mixed dentition. 2.Palatal expansion in late
mixed dentition
• Adults
• SURGICAL correction
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10. Management in the primary
dentition
• Anterior cross bite: removing the
interferences by occlusal grinding or
extracting the primary incisor.
• Posterior cross bite: if the inter molar width
is satisfactory, grinding primary canines to
eliminate deflective contact. If both molar
&canine width are narrow, expansion of the
upper arch is indicated.
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11. Early mixed dentition period
• ACB: Lingually trapped inciors can be
corrected by extracting the adjacent canines
if sufficient space is not available. If
sufficient space is available a maxillary
removable appliance is usually the best
mechanism to correct a simple anterior
cross bite that requires tipping movement.
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12. contd
• PCB: Both removable & fixed appliance is
used. The maxillary arch should be over
expanded and then held passively in this
over expanded position for approximately
3months before it is removed.
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13. Contd
• 3 basic approaches to the treatment of PCB
in children
• equilibration to eliminate mandibular shift
• expansion of the constricted maxillary arch
• re positioning of individual teeth to deal
with intra arch asymmetries.
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14. History of expansion appliance
• 1875 Coffin found the coffin spring
• 1902 Pierre Robin introduced jack screw
• 1924 maxillary crozat appliance by HC
Pollack
• 1947 Rickets introduced the quad helix
• 1960 RPE by Angell
• 1993 nickel titanium palatal expander
byWendell.v .Ardntwww.indiandentalacademy.com
15. COFFIN SPRING
• Made of 1.25 mm SS wire
• differential expansion in molar & pre molar
regions.
• Disadvantages: unstable ,lack control in the
molars,frequent activation needed , force
applied varies.
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16. W- Arch
• Constructed of 36 mil steel wire soldered to
molar bands
• move both primary &permanent teeth
&accelerate the rate of normal expansion of
the mid palatal suture.
• Activated by simply opening the apices of
W
• Expansion should continue at the rate of
2mm per monthwww.indiandentalacademy.com
17. Quad helix
• Constructed with 38 mil steel wire
• Helices in the anterior plate helps in
stopping a sucking habit.
• Indicated for the correction of crossbite &
finger sucking habit.
• Forces are produced when the appliance is
widened by 3to 8 mm
• 3 months of retention is recommended
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18. Indications
• Crossbites in which upper arch need to be
widened
• thumb sucking or tongue thrusting cases
• cleft palate conditions either unilateral or
bilateral
• cases of class 2 & class 3 conditions in
which the upper arch need to be widened.
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19. Disadvantages
• Excessive tipping of teeth buccally
• movement are not long enough & hence not
retained long enough.
• Restriction of tongue space so tongue
function is hampered
• intermittent forces
• frequent activations are required
• uncomfortable for patientwww.indiandentalacademy.com
20. Cross elastics
• Typically run from lingual of upper molar
to buccal of lower . For scissors bite
opposite is followed.
• Indicated for a short period to correct
simple cross bite
• effective in correction of unilateral cross
bites.
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21. NITI palatal expander
• It is a tandem loop ,temperature activated
palatal expander.
• Apply light continuous pressure on the mid
palatal suture.
• Self activated
• action is due to niti’s shape memory
&transition temperature effects
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22. Advantages
• Little clinical manipulation
• absence of lab work
• reduced treatment time
• exerts light continuous forces
• requires no adjustments
• comfortable & minimal patient co operation
• it has a safety system &helps the patient to
mitigate the pressure responsewww.indiandentalacademy.com
23. ELSAA
• Expansion & Labial Segment Alignment
Appliance
• used for the purpose of expansion and labial
segment alignment prior to treatment by
functional appliance
• until 4-6 months into the functional
treatment ,the previous ELSAA must be
worn when ever the functional appliance is
out of mouth. www.indiandentalacademy.com
24. Eccentric screws
• For fanwise maxillary expansion
• Consists of two parts - hinge & special
screw
• Types -
1. Wipla expansoion screw
2. G mullers anterior & posterior fan wise
expansion
3. Screws meant for pressure on single teethwww.indiandentalacademy.com
25. Disadvantages
• Only outward tipping of teeth
• patient cooperation is essential
• force levels decline especially if patient is
not activating properly
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26. Hybrid expanders
• Hilger’s palatal expander- James .J.Hilger-
1991
• rigid midpalatal dysjunction ( nance button
& screw) with flexible( Quad helix)
alveolar tipping type of appliance.
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27. Slow expansion screw
• Introduced by FARRAR
• Piere robin introduced the jack screw & was
incorporated by A.M Schwartz in 1930
• equal division of the plates will provide
reciprocal anchorage
• screw when turned 90degre will drive the
parts of the plate apart by .2mm
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28. Types of screws
• 240 types are available
• some of them are ; 1. Wiese screws
• 2.Pullscrew
• 3. HAUSER spring action screw
• 4.3d screw of Bertoni
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29. Magnetic expansion
• Types ;Platinum cobalt
• Al-Ni-Co
• Ferrite
• Cr-Co- Fe
• Samarium Cobalt
• Neodymium-Iron-boron
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30. contd
• Studies were conducted by Vardimon et al
on female macaca facicularis monkeys
• magnetic expansion from tooth banded or
pallatally pinned appliance delivered ideal
forces compared to jack screw appliance
• Daredilier et al used mid palatal repelling
magnets expansion device to produce both
dental &skeletal changes
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31. Advantage
• Minimum patient cooperation
• less pain &discomfort
• continuous force exerted
• treatment time reduced
• less periodontal disturbances,root resorption
&caries
• no friction
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32. contd
• Less chair side time
• better force
• better directional force control
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33. Disadvantage
• Suffer tarnish &corrosion which is
cytotoxic
• cost
• bitterness.
• Bulk of magnet in space limiting
application
• bio effects of static magnetic field
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34. Management in late mixed
dentition period
• ACB- best method for tipping maxillary &
mandibular teeth out of cross bite is using
finger spring, double helical cantilever ,Z
spring along with an anterior bite plate to
prevent any hindrance to tooth movement
• Fixed appliances are also used for the
correction. Eg maxillary lingual arch with
finger springs.Use of posterior bands
&anterior bonded attachments with a roundwww.indiandentalacademy.com
35. Skeletal cross bite correction in
Pre-Adolescent children
• Corrected by opening the mid palatal suture
• Growth at this suture continues in most
children until late teens & then ceases
• less force is required to open the suture in
primary &early mixed dentition period
• W-ARCH ,Quad Helix & Jack screw
appliance are used .They deliver less than 2
pounds of force.
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36. contd
• A fixed banded or bonded jack screw appl
can be used.
• Advantages ; 1. One can apply heavy force
if needed. 2.Extinguish habit by the virtue
of appliance bulk. 3.Control vertical growth
and posterior eruption if the occlusal
surface are with bite blocks
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37. Functional Appliance
• These appliance incorporate some
components to expand the maxillary
arch,either intrinsic force-generating
mechanism like springs & jack screws or
buccal sheilds to relieve buccal soft tissue
pressure.
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38. Expansion in late mixed dentition
• As age increases, the sutures becomes more
& more tightly interdigitated and opening it
becomes eventually difficult.Avery heavy
force is required to open the suture.10 - 20
pounds of pressure.
• A fixed appliance is required because the
force magnitude is large enough to displace
removable appliance.
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39. Rapid Palatal Expander
• It involves appliance activation of at least
0.5 mm daily
• The force is transmitted immediately to the
teeth & then to the suture.
• 10 -20 pounds of pressure is applied
• the expansion occurs faster & to a greater
extent in the anterior portion of the palate
because of the buttressing effect of the other
maxillary structures in the posterior region.www.indiandentalacademy.com
40. A P MAXILLARY
DEFICIENCY
• Children under the age of 8 this treatment
can be accompolished with a face mask that
obtains anchorage from the forehead and
chin &exerts force on the maxilla via
elastics that attach to maxillary splint
producing tooth movement and
displacement of the maxilla
• in older children above 9 this produces
dental movement &very little skeletalwww.indiandentalacademy.com
41. contd
• Approximately 12 ounces of force is
applied for 14 hours per day
• elastics should be fastened to the splint
between the canine &primary first molar
area
• Ideal patient are: normally positioned or
retrusive incisors,but not protrusive.Normal
or short, but not long, anterior facial vertical
dimensions www.indiandentalacademy.com
42. Mandibular Excess
• Extra oral force applied via chin cup
restrain excessive growth of the mandible
• Two ways to use chin cup :
• First is to apply force on a line directly
through the mandibular condyle
• Second is to orient the line of force
application below the mandibular condyle
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43. Ideal patient for chin cup
treatment
• A mild skeletal problem, with the ability to
bring the incisors end to end or nearly so
• short vertical face height
• normally positioned or protrusive ,but
retrusive lower incisors
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44. Combined surgical & orthodontic
treatment
• For patients whose orthodontic problems
are so severe that neither growth
modification nor camouflage offers a
solution surgical realignment of the jaws or
repositioning of the dento -alveolar
segments is the only possible treatment.
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45. Indications
• Some problems that could have been treated
with orthodontics alone in children become
surgical problem in adults
• Conditions that intially look less severe for
eg.5mm reverse over jet, can be seen even
at an early age to require surgery
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46. Conclusion
• Diagnosis is the golden key to success. A
case of cross bite can be deceptive . So,it is
always mandatory to think before we leap
into conclusion, whether it is cross bite of a
true nature or pseudo. To achieve better
treatment finish,crossbites should be dealt
as soon as detected & the choice of
armamentarium can be left to clinicians
discretion www.indiandentalacademy.com