Enamel and dentin bonding for adhesive restorations

Since the introduction of the acid-etch technique many researchers have pursued methods for reliable and durable adhesion between resins and tooth structure. Numerous simplified adhesives have been introduced to the dental market within the last few years, without comprehensive clinical testing to validate the performance supported by in vitro tests. Because of the high hydrophilic nature of the monomers and the high water concentration required for ionization of the acidic monomers in self-etch solutions, it is likely that these materials have their bonding ability compromised over time. While in vitro tests are useful as a triage step, clinical studies are the ultimate test for any biomaterial. This chapter discusses recent developments in dental adhesives, their benefits, limitations, indications and contraindications.