Prevalences

Question 1

What are the caucasian incisor relationship values?

Answer 1

Class I - 50%
Class II div I - 35%
Class II div 2 - 10%
Class III - 5%

Question 2

What is the prevalence of hypodonita and what is the female:male ratio?

Answer 2

6%

3:2

Question 3

List the commonly missing teeth in order and their percentage

Answer 3

Lower 5’s - 3%
Upper 2’s - 2%
Upper 5’s - 3%
Lower 1’s - 1%

Question 4

What is the prevalence of supernumeraries and what is the male:female ratio

Answer 4

4%

2:1

Question 5

List the 4 types of supernumaries

Answer 5

conical - 75%
tuberculate - 12%
supplemental - 7%
odontome - 6%

Question 6

What is the prevalence of impacted canines and what is the female:male ratio

Answer 6

1-2%

2:1

Question 7

What are the two types of impacted canines and how common are they?

Answer 7

Palatally impacted - 85%

Bucally impacted 15%