COA Dental Anatomy & Oral Development 2

Question 1

At approximately what age do primary (deciduous) teeth typically begin to erupt in infants?

Accepted Answer

6–10 months

Answer

Primary teeth typically begin erupting between 6 and 10 months of age, with the mandibular central incisors usually appearing first.

Question 2

How many teeth are present in a complete primary (deciduous) dentition?

Accepted Answer

20

Answer

A complete primary dentition consists of 20 teeth: 8 incisors, 4 canines, and 8 molars (no premolars in primary dentition).

Question 3

Which permanent teeth typically erupt FIRST into the oral cavity around age 6?

Accepted Answer

Mandibular central incisors and first permanent molars

Answer

Both the mandibular central incisors and the first permanent molars (upper and lower) typically erupt around age 6, marking the transition from primary to mixed dentition.

Question 4

What is the clinical term for the natural shedding of primary teeth as their roots are resorbed to allow permanent tooth eruption?

Accepted Answer

Exfoliation

Answer

Exfoliation refers to the natural, physiologic shedding of primary teeth; it is the result of root resorption triggered by the erupting permanent tooth beneath.

Question 5

The mandibular central incisors typically erupt at approximately what age?

Accepted Answer

6–7 years

Answer

Mandibular central incisors are among the first permanent teeth to erupt, typically appearing between ages 6 and 7 years.

COA - Certified Orthodontic Assistant Practice Test

COA - Certified Orthodontic Assistant Practice Test

COA Dental Anatomy & Oral Development 2