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Ortho Part A > Class 2 > Flashcards

Class 2 Flashcards

1
Q

Malocclusion is not

A

A disease but a spectrum respresenting biological variability

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2
Q

Normal %

A

35%

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3
Q

% handicapped

A

5%

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4
Q

Overjet

A

Antero posterior

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5
Q

Overbite

A

Vertical

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6
Q

Irregularity increased between _____ and _____ and was stable between _____ and _____

A

Childhood youth

Youth adulthood

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7
Q

When does mandibular crowding increase

A

Youth and adulthood

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8
Q

When would a mild class II decrease

A

From childhood to a dole scene probably a results of differential jaw growth during growth spurt

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9
Q

Transverse components

A

Refers to Cross bite

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10
Q

Vertical problems of anterior open bite versus anterior deep bite exhibits

A

Racial differences

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11
Q

Open bites seen more in

A

African Americans

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12
Q

Severe anterior deep bites more common in

A

European Americans

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13
Q

Malocclusion is in most instances a

A

Developmental condition

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14
Q

Hereditary factors

A

Disproportion between size of upper and lower jaws

Disproportion between size of teeth and jaw

Heterogenous gene pool

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15
Q

With increasing age heritability estimates _____ for skeletal and _____ for dental variables

A

Increase

Decrease

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16
Q

Inheritance is particularly strong for ______ ______ followed by ________ of facial development

A

Mandibular prognathism

Long face pattern

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17
Q

Childhood fractures heal mostly

A

Uneventful

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18
Q

Interferences with post natal development

A

Fractures

Muscle dysfunction

Acromegaly

Condyerl huperplasia

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19
Q

Hypodontia

A

Missing 5 or fewer teeth

20
Q

Oligodonitia

A

Missing 6 or more teeth

21
Q

Endodontia

A

Missing all teeth

22
Q

Form Function interaction

A

If function could affect the growth of the jaws and or the position of teeth, then altered function would be a major cause of malocclusion

23
Q

Forces on teeth

A

Are in equilibrium

24
Q

Functional influences

A

Digit sucking
Tongue thrusting
Respiratory pattern
Diet

25
Q

Threshold time

A

6 hours

26
Q

Tongue thrusting

A

Compensatory for open bite-not causation

Tongue interposed at rest will have an effect

27
Q

Adenoid Facies

A

Long face syndrome-increased lower face length

Total obstruction of nasal breathing will haven an effect

Higher % of mouth breathers in long face individuals but the majority of long face individuals are nose breathers

28
Q

Malocclusion is estimated by

A 
Incisor irregularity
Overbite/open
Overjet
Posterior crossbite
Diastema >2
29
Q

Straight Profile indicates

A

Optimal relations of maxilla and mandible and cranial base

Usually skeletal and Dental class I

30
Q

Convex profile

A

Protrusive maxilla
Retrieve mandible

Usually skeletal and dental Class II

31
Q

Concave Profile

A

Retrusive Maxilla
Protrusive Mandible

Usually skeletal and dental Class III

32
Q

Angles classification only applied to

A

Permanent teeth

AP plane of space

33
Q

Most common malocclusion is

A

Skeletal/Dental Class I crowded

34
Q

Within Class I problems exist in the ______ and _______ and you can have Dental malocclusion problems

A

Transverse

Vertical planes

35
Q

Posterior crossbites can be

A

Dental or skeletal constriction

36
Q

Short face often with

A

Deep bite

37
Q

Short face mandible angled

A

Very straight

38
Q

Maxillary position

A

SNA

39
Q

Mandibular Position

A

SNB

40
Q

Maxilla to Mandible

A

ANB

41
Q

Growth direction

A

Y-axis

42
Q

Upper incisor position

A

Upper insider to FH

43
Q

Lower incisor position

A

Lower incisor to Mand Plane

44
Q

To predict the size of the premolar and canine of the mandible

A

1/2 the width of the lower incisors +10.5 mm

45
Q

to predict size of the premolars and canine on side of the maxilla

A

Take 1/2 width of the lower incisors +11 mm

46
Q

Space discrepancy for each arch=

A

Space available- size of incisors + predicted size fo the canine and premolars

Ortho Part A (5 decks)

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