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ORTHO I > lecture 6 > Flashcards

lecture 6 Flashcards

1
Q

deep bite etiologies

A

*Skeletal
*Overeruption of incisors
*Undereruption of molars
or combo of I/M patterns

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2
Q

dentoalveolar processes of deep bites

A

I/M eruptions, typically reversiable processes with current malocclusion

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3
Q

what is the normal UI overlap to LI

A

15-20%

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4
Q

Transverse dimension
*Usually in form of?
* mandible?
*Some are also caused by?

A

*Usually maxillary transverse deficiency
*Maybe caused by overdeveloped mandible (skeletal)
*Some are also caused by unfavorable dental angulations (dentoalveolar)

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5
Q

possible tx

A
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6
Q

Disturbances of Dental Development

A
  1. Congenitally missing teeth
  2. Malformed and supernumerary teeth
  3. Interference with eruption
  4. Ectopic eruption
  5. Early loss of primary teeth
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7
Q

interference of eruption mechanisms

A

due to lack of space leading to: impaction and ectopic eruption

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8
Q

what to do when there is early loss of primary teeth?

A

space maintenance

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9
Q
  1. Congenitally Missing Teeth
A

*Anodontia (very rare)
*Oligodontia (several teeth missing) (>4)

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10
Q

what is wrong

A
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11
Q

what is happening here?

A

oligodontia

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12
Q

Dr Moyers’ Explanations for Congenitally
Missing Teeth
*Heredity?
*syndrome?
*Localised events?
*Systemic?
*Evolutionary changes?

A

*Heredity
*Ectodermal Dysplasia
*Localised inflammations or infections
*Systemic conditions, e.g. ricketts
*Evolutionary changes in the dentition (specially third molars)

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13
Q

commonly missing teeth as a genetic trend

A

LI, lower CI, mandibular PM

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14
Q

Ectodermal dysplasia leads to:

A

*Oligodontia
*Poorly shaped teeth

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15
Q

Most frequently missing teeth based on demos

A

*Upper lateral incisors (caucasians)
*Lower second premolars (all)
*Lower central incisor (asian)

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16
Q

result of missing lower CI

A

increased overjet and canines not in class 1 relation

17
Q

Missing second premolar tx?

A

determine with age, root form and occ plane: typically extract and place implant when older

18
Q

Malformed Teeth

A

*“Peg” maxillary lateral incisors
*Crown can be mishaped
*Root may be shortened

19
Q

Mesio Distal Size of the Dentition (bolton)
factors

A

*Proportionality of tooth sizes within a dentition
*Bolton ratio
factors: tooth and arch size

20
Q

Bolton ratio

A

Overall: M 1st to M of opposite 1st M in each arch
Anterior: same with canines
*In order to develop a proper overbite and overjet, the size of the lower dentition must be proportional to the size of the upper dentition
*This proportion is called the Bolton ratio.

21
Q

Overall and anterior ideal ranges for boltons ratio

A

overall: 87-94 (91%)
anterior: 75-80% (77%)

22
Q

forms of supernumerary teeth

A

mesiodens
supernumerary lateral incisor

23
Q

impacted tooth prognosis

A

guarded

24
Q

Impacted upper central incisors
most often due to?
root may become?
how else can these occur?

A

*Most often caused by trauma to the deciduous tooth. Root can become dilacerated
*Infection of deciduous central
*Cyst
*Supernumary tooth

25
Q

Impacted cuspids

A

*Upper cuspids are the teeth most often impacted (3 to 4%)
*Treatment is difficult and costly

26
Q

Etiology (Theories) of impacted teeth
1. upper arch?
2. A combination of?
3. Missing or small?

A
  1. Narrow upper arch causes a strong probability of impaction. Not valid in the majority of cases
  2. A combination of genetics and familial tendencies
  3. Missing or small lateral incisors, but a normally sized arch
27
Q

majority of malocc from what origins

A

combo skeletal and dentoalveolar

28
Q

environment and genetics roles in malocc

A

*Genetics plays a significant role in the etiology but functional factor are also contributing factors

29
Q

*The treatmetn approach will be defined by:

A

*The treatmetn approach will be defined by the capacity to assess the etiology of the malocclusion as accurately as possible

ORTHO I (9 decks)

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