Which of the following statements about an amalgam tooth/cavity preparation is true?
Correct Answer: The cavosurface margin should provide for a 90- degree amalgam margin.
Description: Although the amalgam margin must be 90 degrees, the enamel margin may not be 90 degrees, especially on the occlusal surface. Most walls converge occlusally, but many Class V amalgam preparations have walls that diverge externally. No retention form should be placed at the DEJ; otherwise, the adjacent enamel will be undermined and subject to fracture.
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Dental
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