Restorative & Materials · single question
Ideal occlusal reduction for a metal crown?
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Correct answer: B. 1.5 mm
- A. 0.5 mm is insufficient to provide adequate metal thickness for strength.
- B. Correct. A full-metal crown classically requires about 1.0-1.5 mm of occlusal reduction, providing enough room for adequate alloy thickness and strength while preserving tooth structure.
- C. 2 mm is excessive for a full-metal crown (more appropriate for all-ceramic/PFM occlusal reduction in some protocols), removing unnecessary tooth structure.
- D. 4 mm is far excessive and would unnecessarily compromise pulpal health and tooth structure.
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