The margins of the intracoronal restoration should not be too close to a centric contact. What is the minimum distance recommended?

The recommended minimum distance of 1.0 mm between the margins of an intracoronal restoration and the centric contact is based on principles of dental occlusion and restorative design. Ensuring this distance helps prevent potential issues such as premature wear on the restoration and the opposing dentition, as well as avoiding the chances of loosening the restoration due to excessive occlusal forces.

When the margins of the restoration are placed too close to the occlusal contact, it can result in increased stress concentration along the margins, leading to fractures or debonding over time. Additionally, a margin that is sufficiently away from the centric contact allows for better adaptation to the cavity and enhances the seal against microleakage, which is crucial for the longevity of the restoration.

In contrast, shorter distances (like 0.5 mm) can compromise the integrity of the restoration and the opposing tooth. Greater distances, such as 2.0 mm or 3.0 mm, while they provide ample space, may not be practical in every clinical scenario and could lead to unnecessary removal of tooth structure. The established minimum of 1.0 mm strikes a balance between functionality and preserving healthy tooth structure, making it the optimal choice.