The class II amalgam cavity
preparation consists of
A -Occlusal segment ( portion)
B- Proximal segment (portion)
In this post we will display the
common mistakes made by students concerning the class II cavity preparation
A- The occlusal segment
The occlusal segment follows the same fundamentals already
given for the class I amalgam except that the external outline is extended
proximally toward the proximal surface.
IDEAL EXTENSION
COMMON MISTAKES
Under extended over extended
IDEAL OCCLUSAL OUTLINE FORM in upper molar ( notice
the curve)
COMMON MISTAKES
B-The Proximal
segment
IDEAL
DIRECTION OF WALLS
COMMON MISTAKES
IDEAL DEPTH ( NOTICE THE PREPARATION OF THE
MARGINAL RIDGE)
COMMON MISTAKES
Use of the hand instrument
RETENTION
COMMON MISTAKES
Excess Flare
Horizontal
section
Lack of flare
Horizontal section
