Principles of tooth preparation
A good preparation ensures that subsequent techniques (e.g., interim restoration, impression making, pouring of dies and casts, waxing) can be accomplished.

The design and preparation of a tooth for a cast metal or porcelain restoration are governed by five principles:

A) Preservation of tooth structure

B) Retention and resistance form

C) Structural durability of the restoration

D) Marginal integrity

E) Preservation of the periodontium



Successful tooth preparation and subsequent restoration depend on simultaneous consideration of all these factors. Improvement in one area often adversely affects and may lead to failure in another area.

Communication between the clinician and dental laboratory regarding any deviation from “ideal” criteria is essential and can prevent misunderstanding, frustration, and ultimate failure.

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