Lecture 1

Question 1

What makes up the bulk of the tooth?

Answer 1

Dentin

Question 2

What is the pulp of the cell made up of?

Answer 2

Fibroblasts, mesenchyme, nerves/blood vessels.

Question 3

Name four causes of non-carious lesions

Answer 3

Attrition, abrasion, erosion, abfraction

Question 4

Define non-carious lesion

Answer 4

Loss of surface tooth structure due to mechanical/chemical factors.

Question 5

What causes carious lesions?

Answer 5

Bacterial infection

Question 6

Distinguish between direct and indirect restoration

Answer 6

Direct: soft material placed in cavity prep and set to harden

Indirect: restoration made outside (in lab) then bonded

Question 7

Distinguish between air-driven and electric handpieces

Answer 7

Air-driven are a mainstay for cutting. We use it, most use it.

Electric - quiet, higher power, smoother.

Question 8

When is a slow-speed used?

Answer 8

Close to pulp, coronal polishing,

Question 9

Approximate rpm of slow-speed?

Answer 9

<12,000 rpm

Question 10

Approximate rpn of medium-speed?

Answer 10

12,000-20,000 rpm

Question 11

Which handpiece is sometimes known for uncomfortable vibrations?

Answer 11

Slow-speed

Question 12

Approximate rpm of high-speed?

Answer 12

> 200,000 rpm

Question 13

What are the four parts of the high-speed handpiece, starting from the bur? Where does this device separate and into how many pieces?

Answer 13

Head, attachment, shaft, coupler.

Separates into 2 pieces, separates at the coupler (coupler is 1 piece, head/attachment/shaft is 1 piece)

Question 14

What are the two different slow-speed attachments? When are they used?

Answer 14

Nose cone/straight - finishing a crown/adjustment to cast. *Will only take long-shank bur

Contra-angled - in the mouth - latch-type and friction burs

Question 15

What are the three components of a rotary instrument?

Answer 15

Head, neck, shank

Question 16

What are the two main rotary instruments and what are they used for?

Answer 16

1) Bladed - preps

2) Diamond (abrasive) - crown preps etc

Question 17

Cutting burs and finishing burs are distinguished by what key feature?

Answer 17

Cutting/excavating burs have a small number of blades (6-8).

FInishing burs have 10-20 blades.

Question 18

In an inverted cone bur, which end would be thinner, proximal or distal?

Answer 18

Proximal (closer to shank is proximal; farther is distal)

Question 19

The 330 bur has what shape? what is its length and diameter? What about 245?

Answer 19

330: pear-shaped,
l = 1.5 mm
d = 0.8 mm

245: pear-shaped
l = 3.0 mm
d = 0.8 mm