Properties and interactions of oral structures and restorative materials

Abstract

New polymeric formulations designed to reduce curing shrinkage, residual unsaturation and hydrophi 1 icity in dental composite restorations have been developed and evaluated. To reduce polymerization shrinkage emphasis has been placed on high molecular weight bulky monomers such as blends of BIS-GMA and diurea dimethacrylate types. While typically moderate to fast-acting accelerators such as bis(N ,N-2-hydroxypropyl )ptoluidine or p -tert-butyl -N ,N-dimethylani 1 ine could not be used with such formulations, substitution of slower acting accelerators such as ethyl -4-dimethyl ami nobenzoate or ascorbyl palmitate yielded formulations that set in clinically acceptable times.Powder/liquid, paste/paste or single paste/visible light cured formulations produced composites with

Properties and interactions of oral structures and restorative materials

“…A technique for determining a castability value, C v » for a dental alloy has been described in previous reports [31 ] . is determined as the percentage of cast alloy segments which comprise a rectangular grid.…”

“…Using the previously determined [31] transformation of was found to represent the castability of each alloy at the 99.95% confidence level; the constants a and b are characteristic for each alloy.…”