Bonding of bioactive glasses to human dentin

摘要

The purpose of this study was to assess the potential of bioactive glasses to bond to human dentin. Bioactive glass beads in the CaO-MgO-P_2O_5-SiO_2 and Na_2O-CaO-P_2O_5-SiO_2 systems were prepared and polished to provide a flat surface for bonding. Human teeth were cut to expose dentin, kept hydrated and treated with a mild phosphoric acid. Each tooth was then placed against a sample of bioactive glass (or non-bioactive glass control) with a thin layer of whole saliva in the interface. The pairs were secured with an elastic band, immersed in whole saliva and placed in an incubator at body temperature for 3 or 6 weeks. Observations showed that the bioactive glasses adhered to dentin, but the non-bioactive glass did not. Bioactive glass/dentin pairs were prepared for analysis across the interface. SEM results showed the presence of a new material in the interface. Microdiffractometry on the glass side of debonded pairs showed crystalline peaks corresponding to those of apatite-like materials. From these results we conclude that a new material is formed at the interface between bioactive glasses and dentin, leading to bonding and promise for the development of new dental materials.