What is crucial about the junction between a tooth and its restoration?

The junction between a tooth and its restoration is crucial because it must be smooth and free of any ledges to promote effective oral hygiene and prevent plaque accumulation. A smooth transition reduces the risk of marginal leakage, which can lead to secondary caries or sensitivity. When the interface is well-adapted and without ledges, it minimizes the potential for food trapping and discomfort for the patient. This careful consideration aids in maintaining the longevity of both the restoration and the natural tooth structure surrounding it.

While minimizing thickness, ensuring aesthetic appearance, and enhancing patient comfort are all important factors in prosthetic dentistry, the primary concern at the junction is the functional integrity of the connection between the restoration and the tooth.