What is a primary disadvantage of metal-ceramic restorations?

The primary disadvantage of metal-ceramic restorations being less conservative refers to the amount of tooth structure that must be removed to accommodate the restoration. Metal-ceramic prosthetics typically require a significant reduction of the natural tooth structure to ensure proper fit and aesthetic integration. This extensive reduction can lead to a greater compromise of the remaining tooth, potentially affecting its long-term integrity and health.

Other disadvantages associated with metal-ceramic restorations, such as high thermal conductivity and increased risk of fracture, are important considerations but are secondary to the impact of tooth reduction when evaluating the overall conservativeness of the approach. The need for substantial tooth preparation can limit treatment options and may lead to complications or the need for further intervention in the future. As a result, when selecting a restoration type, it is crucial to balance aesthetics, function, and the amount of natural tooth structure that is preserved.