Restorative Dentistry and Oral Rehabilitation

Question 1

Ture or False. The crowns of primary teeth are relatively narrower mesiodistally than permanent teeth.

Answer 1

False.

The crowns of primary teeth are relatively wider mesiodistally.

Question 2

In primary teeth, enamel rods are directed in which direction?

Answer 2

Occlusally

Question 3

What happens to the bond strength as the depth of a preparation increases? Why?

Answer 3

The bond strength decreases with increased distance from the DEJ. This is due to the fact that dentin tubules increase in diameter with depth toward pulp; less intratubular dentin to bond to.

Question 4

What are some anatomical considerations when deciding to perform a pulpectomy on a primary tooth?

Answer 4

• Anterior roots are narrower M/D than B/L
• Molar roots are relatively longer, more slender than permanent teeth
• Much more flared than permanent teeth.
• Branch directly from crown with no identifiable root trunk
• Larger apical foramina, with many accessory canals.

Question 5

Is the maxillary 1st primary molar wider M/D or B/L?

Answer 5

B/L. (Think about how often you have to use the Hall pliers to reduce the size M/D due to the extent of the B/L width.)

Question 6

This primary tooth is most similar to it permanent counterpart.

Answer 6

Maxillary 2nd Molar.

Including the cusp of Carabelli

Question 7

This tooth is the narrowest primary tooth M/D

Answer 7

Mandibular Central Incisor

Question 8

The cusp of the maxillary primary canine is displaced M or D?
What about the mandibular?

Answer 8

The cups of the maxillary primary canine is displaced distally.

The cusp of the mandibular primary canine is displaced mesially with a longer distal slope.

Question 9

Is the mandibular 1st molar wider M/D or B/L?

Answer 9

Wider M/D than B/L (Opposite of its maxillary counterpart, think of how much wide M/D the crown of a mandibular 1st is.)