NDECC Practice Questions - NDEB Equivalency Process Clinical Competence (NDECC) Exam

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On the NDECC Clinical Skills Component, you prepare a Class II amalgam cavity on a mannequin molar. Regarding the cavosurface margin of the proximal box for amalgam, which configuration best resists marginal breakdown?

A cavosurface margin of approximately 90 degrees (a butt-joint) A beveled cavosurface margin of about 45 degrees A feathered margin extending to less than 0.5 mm thickness An acute cavosurface margin under 70 degrees to maximize retention

Correct Answer:

A cavosurface margin of approximately 90 degrees (a butt-joint)

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