Exam 2

Question 1

What other material do we used in restorative dentistry that undergoes a crystallization reaction?

Answer 1

Amalgam

Question 2

What do you use for MIP if hand articulation is not possible (i.e. there is not enough teeth)?

Answer 2

Transfer copings

Question 3

Over-contoured crowns contribute to:

Answer 3

periodontal disease

Question 4

A posterior pontic may be up to __% narrower than the tooth it is replacing to reduce the occlusal load.

Answer 4

20%

Question 5

__% of all pontic sites show clinical inflammation.

Answer 5

33%

Question 6

__% of all pontic sites show some inflammatory response under the bridge.

Answer 6

95%

Question 7

Why do we need to use more water in plaster compared to Type IV gypsum?

Answer 7

The shape of the particles is more irregular in type II so more water sorption

Question 8

What is the minimum distance between the crown margin and the alveolar crest?

Answer 8

2.6 mm (Margin ends 0.5 mm coronal to epithelial attachment + 2.1 mm biological width)

Question 9

What kind of forces does orthodontic tooth movement utilize?

Answer 9

Intermittent

Question 10

What can result from excessive orthodontic forces?

Answer 10

Root resorption

Question 11

Is trauma from occlusion reversible?

Answer 11

Yes

Question 12

Can occlusal trauma cause periodontitis?

Answer 12

Yes

Question 13

Too much occlusal pressure results in:

Answer 13

• hyalinization
• vascular changes
• bone resorption

Question 14

Too much tension results in:

Answer 14

• Widening of PDL
• Hemorrhage
• Tearing of PDL
• Resorption

Question 15

What area of the periodontist is most susceptible to injury from excessive occlusal forces?

Answer 15

Furcation

Question 16

When patient has both inflammation and occlusal trauma, which do you treat first?

Answer 16

Inflammation

Question 17

What type of connector would we use for a small unit bridge?

Answer 17

Rigid

Question 18

Overextension of Wax Pattern Fabrication can lead to:

Answer 18

over contouring
open margins
broken margins
incomplete seating of castings

Question 19

Under-extension of Wax Pattern Fabrication can lead to:

Answer 19

short margin
under contour
tooth sensitivity (because of exposed tubules)

Question 20

What are the two common accelerators?

Answer 20

Salt

Gypsum powder

Question 21

Gypsum:
Type 2 water to powder ratio:
Type 3 water to powder ratio:
Type 4 water to powder ratio:

Answer 21

2 = 45ml/100g
3 = 35ml/100g
4 = 22ml/100g

Question 22

What do you use to verify centric relation?

Answer 22

Wax wafer and split cast technique

Question 23

What is the most accurate way to measure MIP?

Answer 23

Hand articulation

Question 24

What is the most accurate way to measure CR?

Answer 24

Bilateral manipulation

Question 25

When there aren’t enough teeth, what can we do to measure MIP?

Answer 25

Resin Transfer Coping

Question 26

Major embrasures for posterior teeth?

Answer 26

Lingual, gingival

Question 27

Minor embrasures for posterior teeth?

Answer 27

Occlusal, buccal

Question 28

Porcelain component = __mm ideal thickness (uniform)

Cast metal component = __ mm minimal thickness (variable)

Answer 28

1 mm

0. 5 mm
   * porcelain should be thicker to hide the metal

Question 29

Addition reaction:

Answer 29

addition silicone

Question 30

Condensation reaction:

Answer 30

polysulfide

condensation silicone

Question 31

Ring-opening reaction:

Answer 31

polyether

Question 32

What is the base and catalyst of polysulfide?

Answer 32

Base = polysulfide
Catalyst = lead dioxide

Question 33

Byproduct of polysulfide?

Answer 33

Water

Question 34

Activator for thermo acrylics?

Answer 34

heat

Question 35

Initiator for thermo acrylics?

Answer 35

Benzoyl peroxide

Question 36

Self-cured resins activator?

Answer 36

tertiary amines