What is the least likely cause of failure for ceramic inlays?

The least likely cause of failure for ceramic inlays is attributed to debonding of the restoration. Ceramic inlays are generally designed with high bonding strengths to the tooth structure and, when properly placed, have a reduced risk of detachment. The adhesion achieved through modern bonding agents significantly minimizes the incidence of debonding compared to other failures.

Bulk fracture is a more common concern with ceramic materials, particularly if the inlay is subjected to excessive masticatory forces or if the ceramic's structural integrity is compromised during placement. Similarly, marginal breakdown may occur due to wear or degradation along the interfaces of the restoration, which can affect its longevity and effectiveness.

While debonding can occur, especially if there is improper technique during the bonding process, it is less prevalent compared to the other mechanisms of failure typically seen in ceramic materials. Thus, the emphasis is placed on the strong bond that exists between the ceramic inlay and the tooth, making debonding the least likely of the potential failure causes.