Ortho - Lecture 3: Epidemiology/Etiology of Malocclusion

Question 1

What % of the population is normal occlusion?

Answer 1

25%

Question 2

What % of the population is class I malocclusion?

Answer 2

50-55%

Question 3

What % of the population is class II malocclusion?

Answer 3

15-20%

Question 4

What % of the population is class III malocclusion?

Answer 4

1-3%

Question 5

Short and broad face

Answer 5

Brachycephalic

Question 6

Long and narrow face

Answer 6

Dolichocephalic

Question 7

Normal face

Answer 7

Mesiocephalic

Question 8

How soon does an orthodontist see a baby born with a cleft lip/palate?

Answer 8

1 week after birth

Question 9

What does an orthodontist do for a cleft lip/palate prior to surgery?

Answer 9

Use appliances/tapes to bring gaps closer together (makes the surgery easier)

Question 10

What are the environmental prenatal influences that can affect malocclusion?

Answer 10

Injury/trauma
Maternal diet
Fetal posture
Alcohol/drugs

Question 11

What are the environmental postnatal influences that can affect malocclusion?

Answer 11

Condylar fracture
Birth injury
Accidents
Avulsion/displacement of teeth

Question 12

What is the most common childhood fracture of the jaw?

Answer 12

Condylar neck of mandible

Question 13

75% of early fractures have ___________ mandibular growth

Answer 13

normal

Question 14

What may affect time of eruption, resorption, and formation of teeth?

Answer 14

High fever

Question 15

What may affect muscular dystrophy, cerebral palsy, and polio?

Answer 15

Diseases of muscle dysfunction

Question 16

What may affect abnormal pattern on resorption, eruption, and gingival disturbance?

Answer 16

Endocrine disorders

Question 17

What causes deficiency diseases like Rickets and scurvey?

Answer 17

Poor diet

Question 18

Poor diet/deficiency diseases may cause severe ____________ due to interference w/ craniofacial growth and development, in addition to perio problems associated w/ significant ________ _________

Answer 18

malocclusion; bone loss

Question 19

What habits and function aberrations can cause malocclusion?

Answer 19

Thumb sucking
Foreign objects
Tongue thrusting
Lip/cheek biting

Question 20

What would you expect to see with a child who sucks their thumb?

Answer 20

Upper incisors proclined
Lower incisors retroclined
Narrow maxilla

Question 21

What would you expect to see with a child who has a tongue thrust?

Answer 21

Incisors displaced
Lip affects seal

Question 22

Result from disturbance during initiation and proliferation stages

Answer 22

Supernumerary teeth

Question 23

What is the most common location of mesiodens?

Answer 23

Between 8 and 9

Question 24

Result from disturbance during initial stages of formation of a tooth

Answer 24

Congenitally missing teeth (anodontia, oligodontia, hypodontia)

Question 25

When does a permanent tooth erupt into the oral cavity?

Answer 25

When 2/3 of the root is developed

Question 26

When a patient has an abnormal labial frenum causing a large space between 2 teeth, do you close the space first or do the frenectomy first?

Answer 26

Close the space first