What is primarily used to improve retention in indirect restorations?

Adhesive bonding is primarily used to improve retention in indirect restorations because it creates a strong chemical or micro-mechanical connection between the restoration and the tooth structure. This bonding process enhances the stability and longevity of the restoration by distributing the occlusal forces more evenly and reducing the likelihood of dislodgement over time.

In indirect restorations, such as crowns, bridges, and inlays, achieving a tight bond between the restoration material and the tooth is crucial. Adhesives often contain specific components that interact with the tooth surface, allowing them to infiltrate and create a durable bond. This is especially beneficial when dealing with materials like ceramics or composite resins, which may not rely solely on geometric design for retention.

Other methods, such as mechanical retention, typically involve shaping the tooth preparation to hold the restoration physically in place. While this technique is important in certain cases, adhesive bonding significantly increases the overall retention and stability of the restoration. Cementation is another valuable process but is generally the phase following bonding; it involves the use of dental cement to secure the restoration in place after bonding has occurred. Intrinsic properties refer to the inherent characteristics of the materials used, but do not directly enhance retention like adhesive bonding does.