First premolar

Question 1

1.

Answer 1

Not present in primary dentition + are the permanent successors to deciduous first molars

Question 2

2.

Answer 2

has occlusal surface arranged as two cusps lying buccally + palatally, or buccally + lingually

Question 3

3.

Answer 3

cusps are of equal height in uppers but lingual is always smaller in lowers

Question 4

4.

Answer 4

mesial + distal edges of all are raised into marginal ridges

Question 5

5.

Answer 5

upper has two roots lying in same orientation as cusps

Question 6

6.

Answer 6

root apices sometimes curve distally

Question 7

7.

Answer 7

concavity between the roots mesially is called the canine fossa + can be a harbour for microorganisms + calculus in pts with periodontal disease

Question 8

8.

Answer 8

lower first molar has one root

Question 9

9.

Answer 9

functions are to:
assist canine to pierce + tear food (cusps)
assist molars to grind food (occlusal surface)
help maintain the shape of the mouth

Question 10

10.

Answer 10

usually tooth to be extracted for ortho reasons, as it lies midway allow the dental arch + can therefore relieve either anterior or posterior crowding