Calcification & Eruption of teeth

Question 1

What is the calcification order for the permanent teeth?

Answer 1

L6, U6, L1, U1, L2, L3, U3, U2, U4, L4, U5, L5

* The rest occurs simultaneously

Question 2

Calcification of the permanent teeth starts at ……

Answer 2

birth with first molar
* Calcification of the enamel takes about 5 years. During this period, teeth are the most sensitive to defects from external agents

Question 3

What is the eruption sequence for the permanent teeth?

Answer 3

(L6, U6, L1), U1, L2, U2, L3, U4, U5, L4, U3, L5

* The rest occurs simultaneously

Question 4

Fluoride supplement is essential from ……

Answer 4

prenatal period to the completion of calcification

Question 5

Root formation is not complete until ……

Answer 5

significant time after eruption

Question 6

What is the eruption sequence of primary teeth?

Answer 6

L1, U1, U2, L2, U4, L4, U3, L3, L5, U5

Question 7

Primary teeth crown is ….. & ….. than permanent teeth

Answer 7

shorter & fatter

* Note that: crown:root ratio is smaller in primary teeth

Question 8

Generally, the roots of primary teeth are ……

Answer 8

long and slender with marked bowing (flaring, to allow space for the permanent tooth)
* No root trunk

Question 9

The primary anterior teeth have facial and lingual bulges because of …….

Answer 9

the teeth are constricted at the cervical line

• Molars have a facial bulge, but lack the lingual
• Note that: cervical ridges are more prominent than the permanent teeth

Question 10

The primary teeth facial and lingual surfaces are …… than the permanent teeth

Answer 10

flatter (from the height of contour to the incisal//occlusal edge)

Question 11

The primary Max. & Mand. second molar resembles …… in the permanent dentition, while the primary Max. & Mand. first molar resembles …….

Answer 11

first molar

nothing in the permanent dentition

Question 12

The primary teeth most damaged by the feeding bottle are …..

Answer 12

primary Max. incisors