operative dentistry

Question 1

what determines cavity design (3)

Answer 1

structure and properties of dental tissue
the diseases (caries, perio, NCTSL)
properties of restorative material

Question 2

primary dentine

Answer 2

makes up bulk of tooth
formed prior to tooth eruption

Question 3

secondary dentine

Answer 3

formed throughout life after root formation complete
similar structure to primary dentine
formed very slowly

Question 4

tertiary dentine

Answer 4

deposited in response to stimulus threatening pulp
formed rapidly
either reactionary or reparative
darker in appearance, irregular structure, no tubules (functions as a plug to protect interior tissues)

Question 5

reactionary vs reparative tertiary dentine

Answer 5

reactionary - secreted by odontoblasts to slow down progression of caries or other chemical attack (mild- moderate attack)
reparative - response to severe insult, laid down by odontoblast-like cells

Question 6

discuss the principles of caries removal

Answer 6

1 - identify and remove carious enamel
2 - remove enamel to identify maximum extent of lesion at EDJ and smooth enamel margins
3 - progressively remove peripheral caries in dentine - from EDJ first then circumferentially deeper
4 - only then remove deep caries over pulp

Question 7

cavosurface margin angle

Answer 7

junction of cavity wall to external tooth surface

Question 8

name 5 advantages of composite

Answer 8

• good aesthetics
• conservation of tooth tissue
• command cure
• low thermal conductivity
• direct bond to tooth via adhesive techniques

Question 9

what makes up amalgam

Answer 9

silver
tin
copper
mercury

Question 10

discuss the hydrodynamic mechanism

Answer 10

1. application of stimulus
2. acts on dentinal tubules
3. increase in dentinal fluid flow
4. generation of AP in intradental nerves
5. AP passes to brain as pain

Question 11

what artery supplies the dental pulps

Answer 11

maxillary artery