What is the recommended incisal reduction for anterior PFM crowns?

• A. 1mm
• B. 1.5mm
• C. 2mm
• D. 3mm

Answer: (C)

The recommended incisal reduction for anterior porcelain-fused-to-metal (PFM) crowns is typically around 2mm. This amount of reduction is important to ensure that there is sufficient space for both the metal substructure and the porcelain overlay, which contributes to the crown's strength, aesthetics, and function.

Achieving this optimal thickness helps maintain the integrity of the tooth while providing enough material for the ceramic to achieve both aesthetic qualities (such as translucency and color matching) and durability. When incisal reduction is inadequate, the crown may not fit properly, and the aesthetic outcome may be compromised due to insufficient space for the porcelain layer, resulting in a less favorable appearance and increased risk of fracture or chipping.

In contrast, reductions that are too minimal, like 1mm or even 1.5mm, may not accommodate the required thickness for both the metal and porcelain adequately, leading to potential functional issues and aesthetic inadequacies. Hence, the 2mm reduction is the standard practice in preparing for anterior PFM crowns.