Dental OSCE (Objective Structured Clinical Examination) Practice Exam

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Prepare for the Dental OSCE Exam with comprehensive questions and interactive study tools. Enhance your clinical skills and knowledge with detailed explanations and scenarios. Achieve exam success and bolster your dental career!

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What is the recommended margin thickness for a PFM crown preparation?

1.0 mm
0.5 mm
0.75 mm
1.5 mm

The correct answer is: 0.5 mm

The recommended margin thickness for a PFM (Porcelain-Fused-to-Metal) crown preparation is typically around 0.5 mm. This thickness is adequate to ensure sufficient strength and stability of the crown while allowing for adequate retention and resistance form during the fabrication process. A thinner margin can help to preserve tooth structure, particularly when a minimal preparation is desirable, and it allows for a better esthetic transition at the margin when the porcelain is fused with the metal. Additionally, a 0.5 mm margin is usually sufficient to prevent complications like excess fragility or lack of fit, which can occur if the margin is too thin. Properly executed margins are crucial for the longevity and functionality of the crown.