cavity preparation

Question 1

what is a class I cavity?

Answer 1

occlusal surfaces of molars and premolars, buccal pits of molars

Question 2

what is a class II cavity?

Answer 2

approximal surfaces of molars and premolars

Question 3

what is a class III cavity?

Answer 3

aproximal surfaces of incisors and canines

Question 4

what is a class IV cavity?

Answer 4

incisal edges of incisors and canines

Question 5

what is a class V cavity?

Answer 5

cervical margins

Question 6

what are the disadvantages of blacks cavity classification?

Answer 6

doesn’t consider root caries or secondary caries

was introduced before composite so more tooth tissue removed than necessary

Question 7

what are the 6 steps of cavity preparation?

Answer 7

1. outline form
2. resistance form
3. retention form
4. treatment of residual caries
5. correction of enamel margins
6. cavity debridement

Question 8

what is outline form?

Answer 8

gaining access to caries

Question 9

what is resistance form

Answer 9

ability to withstand occlusal forces, 2mm depth and floor at 90 degree angle

Question 10

what is retention form?

Answer 10

retaining material in the cavity with grooves, slots, undercuts and occlusal locks

Question 11

how should you manage soft vs hard dentine?

Answer 11

soft dentine is infected and should be removed, firm but stained dentine can be left.

Question 12

what is a line angle?

Answer 12

where 2 lines meet

Question 13

what is a cavosurface angle?

Answer 13

where the cavity wall meets the tooth surface 90-100 degrees

Question 14

what is a point angle

Answer 14

where 3 lines meets