This document discusses the treatment of crossbite. It defines crossbite and classifies it based on location, number of teeth involved, and etiological factors. It describes different types of crossbites such as dental, skeletal, and functional. It then discusses various treatment options for correcting anterior and posterior crossbites in both the preadolescent and adolescent/adult stages. These include the use of appliances like tongue blades, Catlan's appliance, face masks, and fixed appliances involving springs, screws, and expanders.
2. DEFINITION
Cross bite is a deviation of the normal bucco-lingual
relationship of the teeth of one arch with those of the
apposing arch
T.M GRABER
Cross bite is a condition where one or more teeth may
be malposed abnormally,bucally lingually or labially
with reference to the opposing tooth or teeth
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3. CLASSIFICATION
According to their location in the arch
• Anterior Crossbite
• Posterior Crossbite
Unilateral Crossbite
BilaterialCrossbite
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4. CLASSIFICATION
According to the number of teeth
involved
•Single tooth Crossbite
•Segmental Crossbite
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5. CLASSIFICATION
Based On Etiological Factors Responsible For
The Crossbite
•Dental Crossbite
•Skeletal Crossbite
•Functional Crossbite
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6. Dental Crossbite
•These are usually caused due to arch length discrepancy or
an abnormal path of eruption
Skeletal Crossbite
•These are primarily due to mal positioning or
malformation of the jaws
•These can be
Inherited –Class III skeletal pattern
Congenital –Cleft lip and palate cases
Due to trauma at the time of birth
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7. Functional Crossbite
These cross bites are usually caused due to presence
of occlusal interferences during the act of bringing the
jaws into occlusion
These can be caused by the early loss of deciduous
teeth, decayed teeth or ectopically erupted teeth
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8. Buccal non occlusion:( scissors bite )
This is a condition where the maxillary posterior teeth palatal
cusp are placed completely buccal to the mandibular posterior
teeth
Lingual non occlusion
Here the maxillary posterior teeth are placed completely
palatal to the lingual aspect of the mandibular posterior teeth
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9. Etiology of Crossbite
Anomalies of number
supernumerary teeth
missing teeth
Anomalies of tooth size
Anomalies of tooth shape
Premature loss of deciduous and/or permanent teeth
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Prolonged retention of deciduous teeth
10. Delayed eruption of permanent teeth
Abnormal eruptive path
Ankylosis
Presence of habits such as thumb sucking and mouth breathing
can result in narrowing of the dental arch leading to posterior
Crossbite
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11. CORRECTION OF ANTERIOR
CROSSBITE
In preadolescent age group
1. Use of tongue blade
Tongue blade can correct developing crossbite
It resembles a flat ice cream stick
It is placed inside the mouth contacting the erupting tooth
in Crossbite on its palatal aspect
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12. Opposing mandibular tooth acts as fulcrum and the patient
is asked to rotate the oral part of the blade upward and
forward
The
proper use of tongue blade for an hour or two for 10 to
15 days is usually sufficient
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13. 2.Catlan’s appliance
It is lower anterior inclined plane used to treat maxillary
teeth in Crossbite
It has a 450 angulation which forces the maxillary teeth in
Crossbite to a more labial position
Prerequisites for use of inclined plane
Enough space in maxillary arch to align the teeth/tooth
Mandibular incisors should be well aligned to allow
appliance fabrication
Developmental status of mandibular incisors should be such
that they can tolerate the forces generated
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14. Advantages of Catlan's appliance
Ease of fabrication
Rapidity of correction using functional and muscle forces
Lack of soreness or looseness of teeth during treatment
Rarity of relapse
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15. Disadvantages of Catlan's appliance
The patient has difficulty in speech and chewing
Appliance acts as anterior bite plane and prevents
posterior teeth from coming in contact
Appliance cannot be given if mandibular incisors are
periodontically compromised
Prolonged use of appliance can lead to anterior open bite
Possibility of appliance becoming loose and requiring
recementation because of strong occlusal stresses upon it
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16. 3.Face mask
In cases of anterior crossbite due to an actual skeletal
deficiency of maxilla it is possible to mesialize the maxilla
using a protraction face mask
If the maxilla is narrow a rapid maxillary expansion screw
can be employed simultaneously
Petit Face Mask
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17. 4.Functional regulator III
A FR III appliance can be used to correct developing class
III skeletal jaw structure
The appliance stretches the soft tissue envelop around the
maxilla stimulating its anterior growth as well as preventing
the mandible from growing any further anteriorly
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18. 5.Chin cup
A chin cup can be used to redirect the growth of mandible
to prevent or correct the anterior crossbite due to a
prominent mandible
Chin cup tends to rotate the mandible downward and
backward
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19. CORRECTION OF ANTERIOR
CROSSBITE
In adolescent and adults
1.Jack screw
Mini or medium size screws can be used to correct single
tooth or segmental anterior Crossbite in adults
The patient should be cooperative enough to maintain and
activate the screw or at least get it activated at regular
intervals
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20. 2.Double cantilever spring:( Z spring )
• Anterior Crossbite involving one or two teeth can be
treated using a double cantilever spring provided there is
adequate space
• It consist double helix between two parallel arms and the
inferior arm extends as retentive component
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21. •The parallel arms ca be activated as per the requirement to
either push the entire tooth labially or just the mesial or
distal aspect to correct a mesio-palatal/lingual or distopalatal/lingual rotation of the tooth respectively
•The spring should be used along with posterior bite plane
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22. 3. Fixed appliances
Labial arch wire with vertical spring loop
Used to correct incisor lingual cross bite in case where
guide plane is contraindicated
The lingually malposed incisor is ligated to the arch
wire
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23. The vertical spring loops at the molar tubes are
opened to advance the arch wire
This exerts a labial vector of force o the ligated tooth
with the reciprocal force being directed against the
molars
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24. CORRECTION OF POSTERIOR
CROSSBITE
1.Coffin Spring
This is an omega shaped wire (0.9 mm ) in a removable
appliance used for expansion to correct the posterior cross
bite
The expansion produced is slow and bilaterally
symmetrical
If used in mixed dentition stage the appliance is capable of
producing skeletal changes
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25. 2.T Spring
T spring can be used for buccal movement of
premolars
It is made of 0.5 mm hard round stainless steel wire
Spring consist of t shaped arm whose ends are
embedded in acrylic
Spring is activated by pulling the free end of T
towards the intended direction of tooth movement
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26. 3.Jack screw
A jack screw can used in the removable plate to carry out
expansion to correct the posterior cross bite
The
patient should cooperative to maintain the appliance
and activate the screw or atleast get it activated at regular
intervals
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27. 4.Quad helix
It
is a fixed appliance soldered to the molar bands
cemented generally on the first permanent maxillary molars
It
can be reactivated using the three pong plier without
having to be removed from the oral cavity
It
is a versatile appliance and can be used with usual fixed
appliance therapy
It
can produce skeletal effects if given in preadolescent
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28. 5.Rapid maxillary expansion
Bilateral skeletal cross bite with a deep palate and narrow
maxilla can be treated by RME where the mid palatal suture
is split
It
incorporates a screw which is activated 0.5 – 1 mm/day
The
force level can build upto 10 to 20 pounds as the screw
is turned at this rate
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29. The
RME screw can be incorporated in two type of
appliances: Banded RME and cemented RME
The
appliance produces rapid expansion in 3-4 weeks
After
expansion the appliance itself acts as retainer
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30. 6.Fixed appliances
The arch wires can be kept expanded or
constricted depending upon the movement required
Cross elastics
Cross elastics can be used to bring about correction of
individual tooth cross bites in posterior segment
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31. They require lingual attachments (spur, button )along with
the usual Buccal attachments
Bolstering
anchorage can be used to prevent to far buccal or
lingual movement of the teeth under the influence of cross
elastics
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Bolstering anchorage
32. NITI Expanders
These are nickel titanium wires which can be attached to
the lingual sheath that are welded to the molar bands
cemented on the maxillary permanent first molars
Various sizes are available and need to be selected
depending upon the expansion desired and the
pretreatment width of the palate
It brings about slow expansion
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33. Thank you
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