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Sunday, June 29, 2008

Prosthodontics MCQ 52

Sunday, June 29, 2008

Which of the following factors concerning retention and resistance for single unit crowns are false?

  1. Over tapering of the opposing axial walls can be corrected if a band of several millimeters of tooth structure can be prepared circumferentially with a restricted taper of approximately 6 degrees.

  2. As taper increases, the free movement of the restoration will do so likewise, and reduce the retention.

  3. Molar crowns are more retentive than premolar crowns of similar taper.

  4. Typical placement for grooves in a single unit are mesial and distal.

  5. A 7/8 crown with grooves has more retention than a complete crown with no grooves.

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