NBDE Review Questions: Quiz 454 May 18, 2016 by admin Leave a Comment Quiz: Which of the following statements about an amalgam tooth/cavity preparation is true? A. The enamel cavosurface margin angle must be 90 degrees. B. The cavosurface margin should provide for a 90degree amalgam margin. C. All prepared walls should converge externally. D. Retention form for Class Vs can be placed at the DEJ. Δ
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