Lecture #2

Question 1

Primary Tooth Calcification

Answer 1

Calcification begins in utero 13-16 weeks, by 18-20 weeks ALL have begun to calcify

Question 2

Calcification of primary central incisor crowns

Answer 2

Birth-3 months

Question 3

Calcification of primary lateral incisor crowns

Answer 3

4 months

Question 4

Calcification of primary first molars

Answer 4

7 months

Question 5

Calcification of primary canines

Answer 5

8.5 months

Question 6

Calcification of primary secondary molars

Answer 6

10.5 months

Question 7

Sequence of Eruption

Answer 7

Central Incisor
Lateral Incisor
First Molar
Canine
Second Molar
*Variation can occur* 
*Tooth size, morphology and formation are highly inheritable characteristics*

Question 8

Types of Cementoenamal Junction

Answer 8

1. Enamel overlaps cementum
2. End to end
3. Gap exposing dentin
4. Cementum overlapping enamel
5. Enamel extending into bifurcation of molars (creates periodontal risks)

Question 9

Fluorosis

Answer 9

Excess fluoride 一> causes white/brownish spots or bands

Question 10

Tetracycline

Answer 10

while teeth are forming tetracycline may affect teeth, turning them brown to bluish colors

Question 11

Mandibular Central Incisor

Answer 11

Smallest tooth in the mouth
Develops from 4 lobes (3 facial 1 lingual)
Labiolingual dimension is 1mm less than maxillary central (lots of force)
Root is narrow M一>D but wide labiolingual
incisor angles are 90*
Bilaterally symmetrical
Root outline is straight from cervix through middle third, then tapers rapidly