What chemical process produces adhesion to tooth structure in glass ionomer?

The process of adhesion to tooth structure in glass ionomer cements primarily occurs through chelation of polyacrylic acid to calcium ions in the enamel and dentin. When glass ionomer materials are applied to the tooth structure, the polyacrylic acid present in these materials interacts with the calcium ions found in the tooth. This interaction forms a stable bond that enhances the adhesion of the glass ionomer to the tooth.

This bonding mechanism is significant because it allows glass ionomer materials to effectively integrate with the mineral components of dental tissues, providing a strong and durable attachment. Additionally, this chemical bonding contributes to the biocompatibility of glass ionomers and their ability to release fluoride, which can help protect against caries.

Other processes like hydrogen bonding, mechanical retention, and diffusion of monomers, while relevant in other adhesive systems or materials, do not primarily account for the adhesion properties unique to glass ionomer. It’s the chelation process that truly defines the adhesive capabilities of glass ionomer cements in a dental context.