Posterior Crossbites Flashcards
a type of malocclusion, or a misalignment of teeth,
where upper teeth fit inside of lower teeth.
Posterior crossbite
What suture could affect the presence of posterior crossbite?
Palatal suture
____% of adults present with maxillary transverse discrepancy
30%
What is the genetic etiology of posterior crossbites?
Usually maxillary lack of development
Which direction does the midline deviate in the incidence of posterior crossbite?
Toward the side of the crossbite
___ crossbite: caused by deviation of the mandible toward the side of the crossbite
Functional crossbite
_____ crossbite: True asymmetry of the
maxilla or mandible (rare, best example is
cleft lip and palate patient)
- Non functional
- Non functional
- Involves one maxillary and one mandibular tooth
- Eruption issue
Dental crossbite
- Posterior teeth are in
crossbite - Lower midline
deviated in the
direction of the
crossbite
Functional posterior crossbite
- Crossbite is present in centric occlusion
- Cusp to cusp relationship in centric relation
- Bi manual manipulation of the mandible will
result in centered midlines and cusp to cusp
occlusion
Functional crossbite
What is the most common etiology of the functional crossbite?
Lack of transverse development of the maxilla
The upper intercanine distance must be __mm _____ than the lower
intercanine distance.
3 mm wider
What age is the best time to correct a functional crossbite?
8-11
- Sutural expansion with the least
amount of dental tipping - Rapid or moderately rapid
– One activation per day (a quarter
turn of the microscrew) or one
activation every second day
Rapid palatal expansion
How many mm in molar region of expansion do you want?
7mm or 28 activations
