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Principals Of Amalgam Cavity Preparation Practice Test

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Which term describes the general shape and margins of a cavity preparation to preserve tooth structure and caries location?
Correct Answer:
Outline form
Explanation:
Outline form describes the general shape and margins of a cavity preparation with the goal of including all the decayed area while preserving as much healthy tooth structure as possible. It sets the external boundaries so you remove the carious dentin without weakening the tooth, guiding how far the preparation should extend and where the margins should be placed on sound tooth tissue. This foundational framing is what later steps—like shaping the walls for strength or for access—are built upon. Resistance form focuses on maintaining the tooth’s strength under function after preparation, convenience form is about providing access and visibility, and finishing relates to smoothing and refining the final margins after the preparation is complete.

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