L2

Question 1

Principles of tooth preparation

Answer 1

Subtactive processes
Restorative material dictate reduction
Retention, resistance form
Biological factors

Question 2

DImension requirements

Answer 2

Incisal reduction: 2
Facial : 1.5
Circumferential finishline: 1
Lingual clearance: 1
Outline .5 above free gingival margin

Question 3

External surface form is determined when?

Answer 3

Diagnostic stage

Question 4

Microstructure of dental porcelain

Answer 4

SiO4 tetrahedron

Glass with crystallin residuals

Question 5

Crystaline silicate with hi thermal expansion

Answer 5

Leucite

Question 6

Strength mechanism

Answer 6

Crystal reinforcement: slows crack growth
-more crystal=more strength
Stress induced transformation
Preventing Stress corrosion

Question 7

Transformation toughening

Answer 7

stress induces crystals to transform from one lattice to another
Increase volume, closes cracks

Question 8

3 ways to make all ceramic

Answer 8

Metal like
minimal cutback
monolithic

Question 9

metal like

Answer 9

high strength

Opaque

Question 10

minimal cutback

Answer 10

Porcelain only in critical area

Question 11

Monolithic

Answer 11

moderate strength

translucent

Question 12

Microstructure of porcelain

Answer 12

SiO4 tetrahedron

Primarily glass with crystaline residuals