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ortho 2 > crossbite/transverse problems > Flashcards

crossbite/transverse problems Flashcards

1
Q

Anterior Crossbite
* Prevalence:
* Manifested in?

A
  • Prevalence: 2.2% to 11.9%
  • Manifested in the mixed dentition
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2
Q

what arises with no tx of crossbites
* Esthetics?
* Damage to the teeth?
* Gingiva?
* alveolar bone loss?
* mobiility?

A
  • Esthetic problem
  • Damage to the teeth in crossbite through attrition
  • Gingival recession
  • Loss of alveolar bone on lower incisors
  • Excess mobility of lower incisors affected by the crossbite
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3
Q

what occ classes can crossbites be?

A

any of the three

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4
Q

how can we differentiate crossbite etiologies

A

cephalometrics
dental assesment
functional assesment
profile analysis

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5
Q

SNA and SNB angles

A

SNA: indicates max relation in sag plane
SNB: indicates man relation in sag plane

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6
Q

ANB measurement

A

if + maxilla is protruded, if - mandible is protrouded (ant cross bite)

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7
Q

dental assessment of crossbite

A
  • Class III molar relationship
  • (-) overjet or end-to-end relationship with retroclined mandibular incisors (compensated class III malocclusion)
  • If negative overjet, proceed to functional assessment
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8
Q

functional assessment

A

Determine whether a centric relation/centric occlusion (CR/CO) discrepancy exists

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9
Q

what if a pt presents with severe ant crossbite and there is a shift in CR creating end to end?

A

indicates the max I are retroclined(psedpclass 3)

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10
Q

Functional assessment
* At CR, pt may have?
* At CO, patient may have?

A
  • At CR, patient may have a Class I skeletal pattern, normal facial profile and Class I molar relationship
  • At CO, patient may have a Class III skeletal and dental pattern
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11
Q

DENTAL ASSESSMENT
(Molar relationship & overjet) flow chart

A
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12
Q

skeletal vs dental ant crossbite ceph results

A
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13
Q

skeletal vs dental ant crossbite dental results

A

skeletal:
* Severe proclination of upper incisors
* Severe retroclination of lower incisors
* Class III molar relationship MAY or MAY NOT be present in Class III skeletal

Dental:
* Normal inclination/position or severe retroclination/retrusion of upper incisors
* Severe proclination/protrusion of lower incisors
* Class I or II molar relationship
* Presence of anterior functional shift MAY or MAY NOT be present in Class III dental*

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14
Q

skeletal vs dental ant crossbite profiles

A

Skeletal: concave or striaght, may not be present in class3
dental: straight/convex

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15
Q

Early Treatment of dental
anterior crossbite

  • The most common etiologic factor?
  • Focus the treatment plan on?
  • Management options:
  • Extractions?
  • Disking?
  • Opening space?
  • Determine whether?
A
  • The most common etiologic factor for nonskeletal anterior crossbites is lack of space for the permanent incisors
  • Focus the treatment plan on management of the total space situation, not just the crossbite
  • Management
  • Extraction of adjacent primary teeth to provide necessary space
  • Disking of teeth
  • Opening space for tooth movement
  • Determine whether tipping will provide appropriate correction
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16
Q

Early Treatment of dental anterior crossbite fixed appliances

A
  • Fixed inclined planes
  • Reverse crown: A large permanent anterior tooth crown is reverse-cemented to create a gliding plane for max anteriors
  • Maxillary lingual holding arch with springs: Lingual eruption of maxillary lateral incisors in a crowded arch
17
Q

what removable applaince could be used for ant crossbites

A

removable with jackscrew to engage teeth

18
Q

2x4 appliance

A

used to correct ant crossbites: 2 molars with brackets and all four anteriors with brackets for tipping

19
Q

referal for earlt tx of ant crossbites

A
  • Must refer to orthodontist
  • Objective is to reduce the amount of dental compensation to skeletal;
    discrepancy that are often associated with a more severe malocclusion in
    late adolescence
20
Q

facemask use for ant crossbites

A

use of elastics and facemask to protrude maxilla for early ant crossbite tx

21
Q

posterior crossbite prevalence

of Hispanic population
in African-American population
among Caucasians

A
  • 7.3% of Hispanic population
  • 9.6% in African-American population
  • 9.1% among Caucasians
22
Q

most common cause of post crossbite

A

Transverse maxillary deficiency: narrow
maxilla relative to the rest of the face

23
Q

posterior crossbites of dental cause?

A

possible to have normal palatal width but with L inclined posterior maxillary teeth

24
Q

Hidden Posterior Crossbite
* Compensatory changes in dentoalveolar process

A
  • Tipping of maxillary teeth to the buccal
  • Tipping of mandibular teeth to the lingual
  • Uprighting teeth creates a dental crosbite
25
Q

Unilateral Posterior
Crossbite
* May be a?
* Key sign:

A
  • May be a bilateral crossbite with a functional lateral jaw shift as the teeth from centric relation to centric occlusion
  • Key sign: deviation of the mandibular dental midline, relative to the maxillary dental and skeletal midlines, toward the side of the crossbite when the teeth are in maximum intercuspation
26
Q

posterior crossbites due to functional shift sequelae:
1. Compensatory changes where?
2. Modifications of?
3. Development of?
4. teeth?

A
  1. Compensatory changes in the TMJ?
  2. Modifications of soft tissue growth?
  3. Development of skeletal asymmetries?
    NO STRONG EVIDENCE
  4. Attrition of teeth
27
Q

Do Posterior Crossbites due to functional shifts have self correction?

A

do not self correct, must be tx

28
Q

Posterior Crossbites
management

  • skeletal or dental?
  • sides?
  • shift?
  • If dental, which teeth are?
  • when should this be tx?
  • Should the problems be corrected?
  • Can the problem be corrected or masked by treatment?
A
  • Is the crossbite skeletal or dental?
  • Is the crossbite unilateral or bilateral
  • Is there a functional shift?
  • If dental, which teeth are tipped and in which jaws?
  • Should the treatment be initiated at this time or deferred to a later date?
  • Should the problems be corrected?
  • Can the problem be corrected or masked by treatment?
29
Q

management of simple unilateral posterior crossbite

A

Fixed or removable appliances to move teeth
* W-arch, quadhelix (up to age 9 or 10)
* Jackscrew: relatively heavy force that separates the partially interlocked suture

30
Q

types of palatal expansion

anchorage and rates of expansion

A
31
Q

early mixed dentition tx of post crossbite, rate of tx?

A

use slow expansion

32
Q

suture expansion

ages/how to assess

A
  • Suture can be separated in females up to age 16, and in males up to age 18
  • An occlusal radiograph is used
    to assess the midpalatal suture patency
33
Q

Buccal Crossbites
(scissor bite)
* tooth positions
* A complete buccal crossbite (Brodie bite)?

A
  • Buccal displacement of a maxillary posterior tooth, with or without contact between the lingual surface of the maxillary lingual cusp and the buccal surface of the mandibular antagonist’s buccal cusp.
  • A complete buccal crossbite (Brodie bite): a combination of excessive maxillary width and a narrow mandibular alveolar process, although the width of the mandibular base is usually normal
34
Q

Scissor bite tx options

A

**most difficult to tx

  • Elastics
  • Mandibular appliance to upright posterior teeth
  • Lip bumper

ortho 2 (11 decks)

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