What is the minimum recommended occlusal reduction for a PFM crown?

• A. 0.5mm
• B. 1mm
• C. 1.5mm
• D. 2mm

Answer: (D)

The minimum recommended occlusal reduction for a porcelain-fused-to-metal (PFM) crown is indeed 2mm. This amount of reduction is essential to ensure that there is sufficient space for both the metal substructure and the ceramic overlay. A thickness of about 1.5mm to 2mm for the metal coping allows for adequate strength and support, while the additional thickness of the ceramic material contributes to achieving the desired aesthetic appearance and translucency akin to natural teeth. Reducing the occlusal surface to this extent also aids in the prevention of potential fractures of the ceramic due to insufficient material thickness. Proper occlusal reduction ensures that the crown will function effectively within the patient's bite and maintain longevity in clinical use.