CDT 3

Question 1

what is a class I cavity

Answer 1

occlusal surface of molars/premolars, molar buccal pits

Question 2

what is a class II cavity

Answer 2

approximal surface of molars/premolars

Question 3

what is a class III cavity

Answer 3

approximal surfaces of incisors and canines

Question 4

what is a class iv cavity

Answer 4

incisal edge of incisors/canines

Question 5

what is a class v cavity

Answer 5

restoration on cervical margins

Question 6

principles of cavity preparation? describe outline form

Answer 6

shape/boundaries of cavity

all fault/caries removed, weakened enamel removed as well.

Question 7

principles of cavity preparation? describe resistance form

Answer 7

design features, allow tooth to resist masticatory stress without fracture
walls should be flat and smooth
floor of cavity should be flat, so restoration does not tip over when force applied

Question 8

principles of cavity preparation? describe retention form

Answer 8

design features which allow it to retain restoration securely during function
wall convergence, undercut
internal dimensions wider than external, lets it be locked in and more stable. resist outward displacement

Question 9

list 3 principles of cavity preparation

Answer 9

outline form
resistance form
retention form

Question 10

3 further methods to consider for treatment of residual caries?

Answer 10

• classical excavator + round bur
• chemomechanical method
• stepwise excavation

Question 11

augmentation of retention: when there is not much tooth substance to work with?

Answer 11

• acid etch

- dentine bonding agents

Question 12

augmentation of retention: when there is little tooth substance and no cavity walls?

Answer 12

• dentine pins