known causes of malocclusion

Question 1

what are the factors that control malocclusion

Answer 1

Herebditary factors
Interference with normal development
Trauma
Disturbance in normal function

Question 2

how common is normal occlusion

Answer 2

35%

Question 3

what percenet of the population is seen as handicapped

Answer 3

5%

Question 4

what perecent of the pop seen as severe problem

Answer 4

20%

Question 5

what percent of the pop is moderately affected

Answer 5

20%

Question 6

what perecent of the pop is mildly affected

Answer 6

20%

Question 7

what usually is the cause of handicapped occlusion

Answer 7

skeletal

Question 8

what is the causes for malocclusion that is not specific

Answer 8

usually a complex interaction between genetic and environmental factors

Question 9

what did we originally think caused malocclusion

Answer 9

Genetics

Question 10

is malocclusion more common now or in the past

Answer 10

now, since in the past, people were very homogeneous

Question 11

why also may be there more malocclusion today

Answer 11

Reduced size of jaw was faster than that of teeth

Question 12

can civialization be a cause of maloccluded teeth

Answer 12

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

Question 13

what may also be a cuase of maloccluded teeth in america

Answer 13

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

Question 14

do children of interracial marriage have more malocclusio

Answer 14

no, not that simple

Question 15

what did outbreeding show

Answer 15

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

Question 16

what did crossbreeding dogs do

Answer 16

Created malocclusions like that of humans

Question 17

why was the dog breeding study not important

Answer 17

alot of the dogs had Achondroplasia

- not from mixing chacterisitscs

Question 18

what is Achondroplasia

Answer 18

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

Question 19

what did studying interracial mixes in hawaii show about malocclusion

Answer 19

Do not show an increase in malocclusions

Question 20

does heredity affect teeth or skelleton more

Answer 20

Skelton (teeth more affected by environment)

Question 21

how to compare envirnoment and genetics for malloclusion

Answer 21

compair twins (identical and fraternal)

Question 22

how does eruption occur in identical twins

Answer 22

In mirror images of each other

Question 23

what is heritability

Answer 23

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

Question 24

what does it mean to say hereditary is 1

Answer 24

100% of the variable is due to genetics

Question 25

how much did lundstrom say hereditary gives maloccclusion

Answer 25

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

Question 26

how much corrucini and potter show malocclusion say was genetic

Answer 26

almost 0

Question 27

what embyronic feature leads to malocclusion

Answer 27

Fetal alcohol syndrome

Question 28

what causes Microsomia

Answer 28

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

Question 29

what does Microsomia lead to

Answer 29

Underdevelopment of one side of the face

Question 30

what can pressure against the developing face lead to

Answer 30

Interfere with normal development

Question 31

what can cause pressure on the developming face

Answer 31

deficiency in amniotic fluid pierre robin sequence anomolad

Question 32

what does disturbances of embryonic development lead to

Answer 32

Skeletal malocclusions without any other defects

Question 33

pre-natal disturbances of dental leads to

Answer 33

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

Question 34

what is the most common extra tooth

Answer 34

Mesiodens

Question 35

what are the most common missing teeth

Answer 35

Max lateral incisors | Mandibular 2nd premolars

Question 36

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

Answer 36

children with a syndrome

Question 37

what is a common cause of missing teeth

Answer 37

Ectodermal dysplasia

Question 38

does birth often lead to facial injuries

Answer 38

No, usually from before birth

Question 39

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

Answer 39

Functional matrix theory of growth

Question 40

how is facial growth affected by an injury

Answer 40

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

Question 41

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

Answer 41

the extent of soft tissue injury

Question 42

what happens if the PDL is severly damaaged

Answer 42

Ankylosed(no more eruption or ortho able)

Question 43

what happens if the PDL is mildly injured

Answer 43

abnormal development of the root can occur

Question 44

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

Answer 44

Thumb sucking

Question 45

what malocclusion is seen most in thumb suckers

Answer 45

Protruding upper incisors | -upperward and forward pressure on upper teeth

Question 46

what does thumb sucking do to arch width

Answer 46

Narrower, V-shapped maxillary arch

Question 47

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

Answer 47

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

Question 48

what besides thumb sucking can lead to malocclusion

Answer 48

tongue thrust swallow habit | mouth breathing

Question 49

what kind of force tends to move teeth

Answer 49

Light force over a long time

Question 50

what does mouth breathing lead to

Answer 50

open bites, long face malocclusions

Question 51

what causes mouth breathing

Answer 51

Nasal obstruction

Question 52

what part of occlusion has a strong inherited componenet

Answer 52

mandibuar possition