Cavo surface angle for amalgam resoration is butt joint as____________?
Correct answer: B. It increases compresssive and tensile strengths
- A. Decreased compressive, increased strength
- B. It increases compresssive and tensile strengths
- C. Decreased compressive, decrease tensile strength
- D. Increased compressive, increased tensile strength
Explanation
Amalgam margins should have a 90-degree butt-joint cavosurface angle so the material has adequate bulk and is supported by tooth structure. This design helps the restoration withstand both compressive and tensile stresses and avoids a thin, fracture-prone edge.
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