The Study of Elastomeric Liners for Dental Restorations.

摘要

Elastomeric acrylate resins,based on N-butyl methacrylate and N-propyl methacrylate and containing tetraethyleneglycol dimethacrylate and methacrylic acid,used as an intermediate layer between a composite restorative resin and phosphoric acid-etched dentin,provided tensile strengths of adhesion of 800-1,300lb/sq in on formaldehyde-stored human teeth and 500-700lb/sq in on fresh human teeth. The addition of a chelating copolymer to the compositions compromised the strengths of adhesion. The identity of the initiator system had a significant effect on the strength of adhesion achieved. Rupture of the bonds occurred both cohesively and adhesively. Selected resins demonstrated a reduction in dye penetration in extracted human teeth. They significantly improved in vivo retention of restorations placed over lined cavities without intercuts in dogs. Resin pellets implanted in rat tissue showed acceptable toxicity,and acceptable levels of pulpal irritation were recorded with the etchant-liner-resin system in Rhesus monkeys.