Lecture #2

Question 1

G.V. Black

Answer 1

“father of modern restorative dentistry”, standardized tooth prep

Question 2

(G.V. Black cont.) “extension for prevention”

Answer 2

= minimize recurrent caries outline form

Question 3

(G.V. Black cont.) tooth prep:

Answer 3

location,
extent,
restorative material

Question 4

(G.V. Black cont.) Seven principles:

Answer 4

outline form, resistance form, retention form, convenience form, caries removal,
enamel finishing, preparation cleaning

Question 5

Outline form:

Answer 5

bring margins to final location (depends on location/extent)

 o self-cleaning, preserve tooth structure, esthetics, 
 functional requirements, restorative material,
 secondary factors

Question 6

Resistance form:

Answer 6

resist fracture/displacement during mastication

 o wall angulation, depth of prep, internal line angle 
 definition (rounded pulpoaxial), restorative material

Question 7

Retention form:

Answer 7

resist dislodgement of non-bonded restoration

 o wall friction, retentive points/grooves, auxiliary 
 devices

Question 8

Convenience form:

Answer 8

need access for visualization and instrumentation

Question 9

Class II Amalgam PREP (3 parts!!!)

(sorry :’(((( I split it up, but this part kind of confused me on how I should seperate it - so here it is all together!)

Answer 9

o Proximal box –
▪ caries below contact – need to access through marg. ridge occlusally
▪ break tooth contact (0.25 mm – explorer point)
▪ self-retentive (converging) lateral walls
▪ retention grooves
● axial-lateral line angle (B-L, not into axial wall) = retentive, away from pulp
● up to pulpal floor
● use 1⁄4” round bur
▪ width: 1.25-1.5 mm (bulk)

o S-curve occlusal-proximal transition (smooth, conservative), convex axial wall (follow surface)

o ***Amalgam resistance form
▪ parallel vertical/horizontal walls/floors
▪ dentin support on pulpal floor (best for amalgam)
▪ rounded pulpal-axial line angle (not too sharp)
▪ 90° cavosurface margins (no unsupported enamel rods) – perpendicular to surface
▪ minimum depth: 1.5-1.75 mm bulk