DA Compendium page 3

Question 1

Primary teeth show first evidence of calcification in utero during what trimester of pregnancy?

Answer 1

During the 2nd trimester

- Approximately 14 weeks

Question 2

Primary teeth calcification of crowns is complete by when?

Answer 2

By 11 months (Maxillary 2nd molars)

Question 3

Which arch of teeth in primary teeth erupt first? Mandibular or Maxillary

Answer 3

Mandibular teeth usually erupt before their maxillary counterparts

Question 4

Which primary teeth erupt first and at what time period? Which primary teeth erupt last?

Answer 4

First: Mandibular central incisors –> 10 months
Last: Maxillary 2nd molars –> 29 months

Question 5

All roots of primary teeth have formed by what time period?

Answer 5

39 months (maxillary canines)

Question 6

Which are the first PERMANENT teeth to initiate calcification and when does this occur?

Answer 6

1st molars are first and they do so AFTER BIRTH

Question 7

Which arch of teeth in permanent teeth erupt first?

Answer 7

Mandibular teeth usually erupt first

**EXCEPTION: Maxillary 2nd premolar which may erupt at the same time or before the mandibular 1st premolar

Question 8

Which of the permanent teeth are first to erupt and when does this occur?

Answer 8

1st molars are the first at 6 yrs. of age

- This initiates the “Mixed Dentition” phase of development

Question 9

When does the Mixed Dentition phase of development begin and what initiates this phase?

Answer 9

At 6 yrs of age the first permanent dentition erupts (1st molars) which initiates this phase of development

Question 10

Which teeth are the first succedaneous permanent teeth to erupt? At what age does this occur?

Answer 10

Mandibular Central Incisors –> 6-7 yrs of age

Question 11

Which teeth are the last succedaneous permanent teeth to erupt?

Answer 11

Maxillary Canines (age??)

Question 12

Which permanent teeth are last to initiate calcification? What age does this occur?

Answer 12

3rd Molars –> 9 yrs of age

-**Also last to complete crown formation and erupt

Question 13

From a Facial or Lingual view, all teeth have what geometric shape?

Answer 13

Trapezoidal; Shorter parallel side oriented cervically (gingivally)

Question 14

From a Proximal view, Anterior teeth have what geometric shape?

Answer 14

Triangular with the apex oriented incisally

Question 15

From a Proximal view, Maxillary posterior teeth have what geometric shape?

Answer 15

Trapezoidal with the shorter parallel side oriented occlusally

Question 16

From a Proximal view, Mandibular posterior teeth have what geometric shape?

Answer 16

Rhomboidal

Question 17

The Maxillary incisors have what incisal edge orientation from the proximal view?

Answer 17

Centered over the long-axis bisector of the tooth

Question 18

The Maxillary Canines have what incisal edge orientation from the proximal view?

Answer 18

Cusp tip is centered over or slightly facial to the long axis bisector of the tooth
- ** NEVER LINGUAL

Question 19

Mandibular Incisors have what incisal edge orientation from the proximal view?

Answer 19

Lingual to the long-axis bisector of the tooth

Question 20

Mandibular Canines have what incisal edge orientation from the proximal view?

Answer 20

Lingual to the long-axis bisector of the tooth

Question 21

Review: Which teeth have an incisal edge orientation that is lingual to the long-axis bisector of the tooth?

Answer 21

Mandibular incisors and canines

Question 22

T or F, The maxillary canines have a cusp tip centered over or slightly lingual to the long axis bisector of the tooth

Answer 22

False, Centered or slightly FACIAL. Never lingual