Restorative & Materials · single question
A tooth has only 0.5 mm of coronal structure remaining after crown preparation. Main concern?
Show answer and explanation
Correct answer: A. Ferrule height
- A. Correct. Inadequate remaining axial wall height compromises the ferrule (the ~1.5–2 mm of sound circumferential tooth structure needed for crown/post retention and fracture resistance).
- B. Occlusal clearance concerns reduction for material thickness, not the ferrule deficiency.
- C. Post length matters but the immediate concern with 0.5 mm coronal tooth is the missing ferrule.
- D. Margin design is secondary to having enough tooth for a ferrule.
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