What is the maximum amount of unsupported porcelain allowed in dental restorations?

The correct amount of unsupported porcelain permissible in dental restorations is 2mm. This limit is vital because unsupported porcelain structures are more susceptible to fracture and failure under chewing forces. The 2mm guideline ensures that there is sufficient underlying dentin or other supportive material to provide the necessary strength and longevity for the restoration.

Porcelain, while aesthetically pleasing and durable, requires adequate support to minimize the risk of breakage. The thickness of 2mm allows for a balance between maintaining aesthetics and ensuring functional durability. This is particularly important in posterior teeth where occlusal forces are greater.

In the context of the other thickness options, lower limits might not provide sufficient material to withstand these forces effectively, leading to potential failure of the restoration over time. Thus, 2mm is established as the maximum limit for unsupported porcelain in dental restorations to ensure both functionality and aesthetics.