Which of the following factors is crucial for the longevity of a dental restoration?

The longevity of a dental restoration is highly dependent on retention. Retention refers to the ability of the restoration to stay securely in place within the oral cavity over an extended period. A well-retained restoration minimizes the chances of debonding, which can lead to complications such as decay beneath the restoration or loss of function.

When evaluating dental materials and techniques, achieving adequate retention is a primary concern. Factors affecting retention include the design of the restoration, the type of material used, the surface area in contact with the tooth structure, and the bonding methodologies employed. For example, different types of dental cements or adhesives can enhance retention by creating a stronger bond between the restoration and the remaining tooth structure.

Other factors like esthetics, cost, and color match are certainly important in the selection of a restoration but do not directly impact its durability and functional performance. While a great color match or aesthetic appeal can satisfy patient preferences and improve their confidence, if the restoration lacks retention, it may fail sooner, rendering these factors irrelevant in terms of long-term success.