Which type of cement is considered the most retentive?

Adhesive resin cements are noted for their superior retentive properties due to several factors. They create a strong bond between the ceramic materials of restorations and the tooth structure, primarily thanks to the incorporation of adhesive mechanisms. These cements often involve a bonding agent that chemically interacts with both the tooth and the restorative material, resulting in a micromechanical bond and a strong adhesion.

Additionally, adhesive resin cements can be cured using light, allowing for greater control over the setting process and resulting in enhanced strength and physical properties once fully set. This high level of retention is particularly important in clinical scenarios where the longevity of the restoration is critical, such as in the bonding of porcelain veneers and crowns.

The other types of cement, while useful in specific situations, do not offer the same level of retention. For example, glass ionomer cement provides good adhesion but does not match the bond strength of adhesive resin cements. Permanent cement is used for long-term restorations yet lacks the same adhesive properties as resin cements. Temporary cement is designed for short-term use and is easily removable, thus being less retentive than adhesive resin cements. This context further highlights why adhesive resin cements are the most retentive option among the listed choices