Benzodioxole derivative as coinitiator for dental resin

Abstract

Objective. The aim of this work was to examine whether it was possible to substitute benzodioxole derivatives for amine as coinitiators for dental application. Material and Methods. A mixture of urethane dimethacrylate (UDMA)/triethylene glycol dimethacrylate (TEGDMA) (70/30 wt%), camphorquinone (CQ) and coinitiators was photocured. Real time Fourier Transform Infrared Spectroscopy with a horizontal sample holder was used to monitor the extent of polymerization. Dynamic mechanical analysis was performed over a temperature range from −50°C to 200^oC, with a ramping rate of 5^oC per minute, using extension mode. Results. Benzodioxole derivatives as coinitiator improved the rate of polymerization and final double bond conversion of the dental resin. The cured samples showed similar properties, e.g. modulus, glass transition temperature, water sorption and solubility. Conclusion. The results indicate that two benzodioxole derivatives, piperonyl alcohol (PAL) and benzodioxole (BDO), are viable alternatives to conventional amines as coinitiator. The biocompatibility of benzodioxole derivatives makes them more promising than amine in dental resin formulations.