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ortho > known causes of malocclusion > Flashcards

known causes of malocclusion Flashcards

1
Q

what are the factors that control malocclusion

A

Herebditary factors
Interference with normal development
Trauma
Disturbance in normal function

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2
Q

how common is normal occlusion

A

35%

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3
Q

what percenet of the population is seen as handicapped

A

5%

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4
Q

what perecent of the pop seen as severe problem

A

20%

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5
Q

what percent of the pop is moderately affected

A

20%

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6
Q

what perecent of the pop is mildly affected

A

20%

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7
Q

what usually is the cause of handicapped occlusion

A

skeletal

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8
Q

what is the causes for malocclusion that is not specific

A

usually a complex interaction between genetic and environmental factors

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9
Q

what did we originally think caused malocclusion

A

Genetics

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10
Q

is malocclusion more common now or in the past

A

now, since in the past, people were very homogeneous

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11
Q

why also may be there more malocclusion today

A

Reduced size of jaw was faster than that of teeth

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12
Q

can civialization be a cause of maloccluded teeth

A

some change in the expression of genes may be a slight contributor to malocclusion

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13
Q

what may also be a cuase of maloccluded teeth in america

A

since genetic melting pot, leads to different characteristics of different cultures being present in one child

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14
Q

do children of interracial marriage have more malocclusio

A

no, not that simple

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15
Q

what did outbreeding show

A

There are no independently inherited tootha nd jaw characteritics that produce malocclusion when present

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16
Q

what did crossbreeding dogs do

A

Created malocclusions like that of humans

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17
Q

why was the dog breeding study not important

A

alot of the dogs had Achondroplasia

- not from mixing chacterisitscs

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18
Q

what is Achondroplasia

A

deficient growth of primary cartilage which causes midface deficiency and short limbs

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19
Q

what did studying interracial mixes in hawaii show about malocclusion

A

Do not show an increase in malocclusions

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20
Q

does heredity affect teeth or skelleton more

A

Skelton (teeth more affected by environment)

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21
Q

how to compare envirnoment and genetics for malloclusion

A

compair twins (identical and fraternal)

22
Q

how does eruption occur in identical twins

A

In mirror images of each other

23
Q

what is heritability

A

The proportion of variation in a given characteristic that is attributed to genetic over envirnomental factors

24
Q

what does it mean to say hereditary is 1

A

100% of the variable is due to genetics

25
Q

how much did lundstrom say hereditary gives maloccclusion

A

50% of malocclusion from identical twins especially skeletal and dental overjet

26
Q

how much corrucini and potter show malocclusion say was genetic

A

almost 0

27
Q

what embyronic feature leads to malocclusion

A

Fetal alcohol syndrome

28
Q

what causes Microsomia

A

early loss of neural crest cells at the stage of origin and migration

29
Q

what does Microsomia lead to

A

Underdevelopment of one side of the face

30
Q

what can pressure against the developing face lead to

A

Interfere with normal development

31
Q

what can cause pressure on the developming face

A

deficiency in amniotic fluid
pierre robin sequence
anomolad

32
Q

what does disturbances of embryonic development lead to

A

Skeletal malocclusions without any other defects

33
Q

pre-natal disturbances of dental leads to

A

class I malocclusions with normal sized jaw
extra deeth
weird shapped teeth

34
Q

what is the most common extra tooth

A

Mesiodens

35
Q

what are the most common missing teeth

A

Max lateral incisors

Mandibular 2nd premolars

36
Q

what kind of children tend to have multiple congenitally missing teeth or extra

A

children with a syndrome

37
Q

what is a common cause of missing teeth

A

Ectodermal dysplasia

38
Q

does birth often lead to facial injuries

A

No, usually from before birth

39
Q

what does the effect of trauma to the face and jaw lead to malocclusion go with what theory of growth

A

Functional matrix theory of growth

40
Q

how is facial growth affected by an injury

A

by healing of facial and soft tissue injuries more than hard tissue injury
- especially scaring

41
Q

if a tooth is displaced but not loss, what determines long term injury

A

the extent of soft tissue injury

42
Q

what happens if the PDL is severly damaaged

A

Ankylosed(no more eruption or ortho able)

43
Q

what happens if the PDL is mildly injured

A

abnormal development of the root can occur

44
Q

what is the most common habit that may take teeth out of equilibrium

A

Thumb sucking

45
Q

what malocclusion is seen most in thumb suckers

A

Protruding upper incisors

-upperward and forward pressure on upper teeth

46
Q

what does thumb sucking do to arch width

A

Narrower, V-shapped maxillary arch

47
Q

why does thumb sucking lead to narrow, V shaped maxilary arches

A

increased pressure against the teeth as the cheeks are tightened during suck
a lowered tongue posture

48
Q

what besides thumb sucking can lead to malocclusion

A

tongue thrust swallow habit

mouth breathing

49
Q

what kind of force tends to move teeth

A

Light force over a long time

50
Q

what does mouth breathing lead to

A

open bites, long face malocclusions

51
Q

what causes mouth breathing

A

Nasal obstruction

52
Q

what part of occlusion has a strong inherited componenet

A

mandibuar possition

ortho (22 decks)

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