What type of material is primarily used to bond highly retentive restorations to tooth structures?

The primary material used to bond highly retentive restorations to tooth structures is glass ionomer materials. Glass ionomer cements have unique properties that make them ideal for this purpose. They provide a strong bond to both dentin and enamel due to their chemical interaction with the calcium ions in the tooth structure. Additionally, glass ionomer materials release fluoride, which can help prevent future caries and enhance the overall health of the tooth.

While resin composites can also be used for bonding restorations and have excellent aesthetic qualities, they are not as effective as glass ionomers in terms of chemical bonding and the ability to release fluoride. Amalgam, while a durable restorative material, does not bond to tooth structures in the same way and relies on mechanical retention, rather than bonding. Rubber dam material is not a restorative material and is used for isolation during dental procedures but does not have any bonding properties to teeth.