131-147 Flashcards
1
Q
the design of a preparation for a cast restoration and the execution of that design are governed by:
A
- presevation of tooth structure
- retention and resistance
- structural durability
- marginal integrity
- preservation of the periodontium
2
Q
an extracoronal restoration uses ___ for retention
A
opposing external surfaces for retention
3
Q
an intracoronal restoration uses ___ for retention
A
opposing internal surfaces
4
Q
as taper increases, ___ decreases
A
retention
5
Q
why is a full crown preparation more retentive on a molar than a premolar
A
because molar preparation has greater surface area
6
Q
a preparation with [limited OR unlimited] freedome of displacement is much less retentive
A
unlimited
7
Q
the wals of a groove must be [perpendiculr OR parallel] to rotating forces to resists displacement
A
perpendicular
8
Q
how far should you view a preparation with one eye
A
30 cm, 12 inches
