When evaluating a completed full crown preparation it is necessary to view the tooth facially, occlusally and proximally. From the occlusal view it is possible to determine (Select all that apply):
A. Marginal integrity
B. The line of draw
C. dimensional discrepancies
D. The presence of undercuts
E. Retention and resistance

Proper preparation ensures that subsequent techniques (temporary restorations, impression taking, mold and model casting, waxing, etc.) can be performed. The success of tooth preparation and subsequent restoration depends on considering all these factors simultaneously.

Improvements in one area can often have a negative impact and lead to failure in another. Excessive removal of tooth structure can have many adverse effects. Too large or too short a tooth taper unnecessarily sacrifices retention and resistance.

The property of a tooth preparation that resists movement of the crown along the vertical or alignment direction is called retention. The property of the tooth preparation that increases the stability of the restoration and resists displacement along an axis other than the placement direction is called resistance.

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