Cutting instruments

Question 1

what are high speed burs used for?

Answer 1

Drilling into enamel and dentin

Question 2

What are slow speed burs used for?

Answer 2

Removal of caries and refining prep

Question 3

Function of the following bur shapes: round, inverted cone, pear-shaped, straight fissure, tapered fissure. List an example of each if it was used in lab

Answer 3

Round: Caries removal. Pin placement.
Inverted cone: Cavity preps. making undercuts/convergence on axial walls (245)
Pear-shaped: pediatric dentistry. Composite preps with rounded internal angles (329, 330)
Straight fissure: Complex amalgam cavity preps or for smoothing preps (56, 556)
Tapered fissure: For indirect restos and to obtain clearance (169, 169L)

Question 4

List the important burs, their shape, and diameter that we had to memorize for the first quiz

Answer 4

56 - straight - 0.8mm
556 - straight CC - 0.8mm
169 - tapered - 0.9mm
169L - tapered - 0.9mm
329 - pear - 0.6mm
330 - pear - 0.8mm
245 - long inverted cone rounded corners - 0.8mm

Question 5

the ___ the bur, the less likely to perforate the pulp

Answer 5

The LARGER the bur, the less likely to perforate the pulp

Question 6

What do cross cuts cause?

Answer 6

cross cuts cause the bur to cut faster without having the same amount of heat generated. INCREASE CUTTING EFFICIENCY

Question 7

name the 3 parts of cutting instruments

Answer 7

blade, shank, handle

Question 8

Instrument angles:

Answer 8

straight, monangle (hoe), binangle (hatchet, margin trimmers), triple angle (perio)

Question 9

Location of the primary and secondary cutting edges of the hatchet. What is it used for?

Answer 9

primary: tip of the blade
secondary: length of the blade
used to smooth axal walls and pulpal floors

Question 10

___ ___ are used to create bevels and undercuts

Answer 10

Margin trimmers

Question 11

Spoon excavator is used for:

Answer 11

removal of caries