6. • It’s a condition where one or more teeth may be
abnormally malposed buccally or lingually or labially
with reference to the opposing tooth or teeth –Graber
• Discrepancy in the buccolingual relationship of the
upper and lower teeth –Laura
• An abnormal buccolingual (labiolingual) relationship
of the teeth –Moyer
• Post X-bite: Deviation from ideal occlusion in the
transverse plane of space. -Proffit
13. FUNCTIONAL LATERAL CROSSBITE
• Caused by an occlusal interference that
requires the mandible to shift either
anteriorly or laterally in order to achieve
maximum occlusion
14. • COMPLETE MANDIBULAR CROSSBITE
When all the mandibular teeth are buccally
positioned to all the maxillary teeth if the
mandibular arch is wide
• COMPLETE MAXILLARY CROSSBITE
When the maxillary dental arch is wide
15. COMPLETE CROSSBTE
when all teeth in one arch are positioned either
inside or outside to the all teeth in the opposing
arch.
16. SCISSOR BITE
is present when one or more of the adjacent posterior teeth are
either positioned completely buccally or lingually to the antagonistic
teeth and exhibit a vertical overlap.
e.g: brodie syndrome, pierre robin syndrome---primary,mixed!
Chewing,muscle,normal growth of Mn.
17. ANTERIOR CROSSBITE
A malocclusion in which one or more of the upper
anterior teeth occlude lingually to the mandibular
incisors; the lingual malpositions of one or more
maxillary anterior teeth in relation to the
mandibular anterior teeth when the teeth are in
centric relation occlusion
18. This is when the upper incisors are in reverse overjet and occlude lingual to the
lower incisor. An example of this would be an extreme class III incisor relationship.
19. POSTERIOR CROSSBITE
When one or more posterior teeth locked
in an abnormal relation with the opposing
teeth of the opposite arch; can be either
buccal or a lingual cross-bite and may be
accompanied by a shift of the mandible.
44. II- MIXED DENTITION
•
•
•
•
•
Rationale for Early Interceptive Treatment:
Little possibility for self-correction
To save permanent dentition.
Postponing Rx---greater complexity
Can cause growth modifications and dental
compensations
• Permanent deviation & craniofacial asymmetry &
masticatory patterns
• Condylar deviation & TMJ sounds
45. • Interference with growth of the middle third
of the face
• Abnormal speech patterns
• Loss of arch integrity
• Periodontal disease
• Undesirable esthetics
• Root resorption of central incisors
46. • Those that deliver rapid-heavy-intermittent
forces:
• Fixed inclined bite planes
• Constructed of acrylic
• Placed onto the mandibular incisors
• Treat lingually locked maxillary incisors
• Do not require patient compliance
• May open the bite, create a temporary
• speech defect, or traumatize the dentition
• No significant long-term side effects
47.
48. • Reversed stainless steel crowns
• Anterior stainless steel crowns cemented
backwards on the maxillary teeth
• Stainless steel crown needs to open the bite 2 to
3 mm and establish at least a 25 percent
overbite for successful treatment
• If they worsen or fail to treat the crossbite, add
crown
49.
50. • Tongue Blades
• Usually employed as a follow up to treatment
with inclined plane
• Simplest but least successful approach
• Works best if the bite is normal and the involved
tooth is newly erupted
51.
52. PERMANENT DENTITION
• Individual teeth displaced into anterior
crossbite
• Transverse maxillary expansion by opening the
midpalatal suture
56. RAPID PALATAL EXPANSION
-Activation is 0.5 mm per day
i.e. 2 turns for the screw
-force is 10-20 lbs of forces
applied
-Forces transmitted on suture
SLOW PALATAL EXPANSION
-Activation is 1mm per
week
-2lbs pressure applied
-less pressure to teeth and
sutures
58. • Movement of the lateral and medial
poles of the working condyle during
mastication in patients with unilateral
posterior crossbite
• condylar movements in patients with
unilateral posterior crossbites might be
related to the susceptibility to TMJ disc
displacement
59. • Ultrasonographic Thickness of the Masseter
Muscle in Growing Individuals with Unilateral
Crossbite
• The masseter muscle in untreated individuals with
unilateral crossbite is thinner in the crossbite side
when compared to the non-crossbite side possibly
due to asymmetric activity of the masticatory
muscles. Such an asymmetry in thickness of the
masseter muscle could not be detected some years
after the successful correction of the crossbite.
