Dental Polymeric Composites Activated With Camphorquinone or Diacyl Phosphine Oxide Photoinitiators

Published

August 1, 2004

Author(s)

N D. Richards, Sabine H. Dickens, Joseph M. Antonucci

Abstract

Polymeric dental composites based on the highly viscous 2,2-bis[p-(2-hydroxy-3-methacryloxypropoxy)phenyl]propane (BisGMA) have been used for over four decades.1 Because of its high viscosity, BisGMA is blended with diluent, lower molecular mass monomers to provide a workable matrix resin for composites.2 One commonly used diluent monomer is triethylene glycol dimethacrylate (TEGDMA), which unfortunately can leach out of cured composites at high rates.2,3 Several less viscous, high molecular mass monomers that can serve as replacements for BisGMA have been evaluated as polymer matrices for composites. This study examined two such monomers, 1,6-bis-(methacryloxy-2-ethoxycarbonylamino)-2,4,4-trimethylhexane (urethane dimethacrylate or UDMA) and an ethoxylated bisphenol A dimethacrylate (EBPADMA). It has been reported that UDMA (Mw = 471) has a viscosity of 28 Pa s and EBPADMA (Mw = 562) has a viscosity of 3 Pa s compared to BisGMA (Mw = 512) with a viscosity of 1369 Pa s.4 With these lower viscosities, the monomers are attractive candidates for use as matrix resins without lower molar mass diluent monomers.Camphorquinone, a traditional photosensitizer for dental composites, undergoes a redox reaction with a tertiatry amine to produce radicals for free radical polymerization of the dental composite.5 Another class of photoinitiators, phenylphosphine oxides, was examined in this study. The phosphine oxides undergo an a-cleavage to produce two free radicals: a carbonyl and phosphinoyl radical.6 The biacyl phosphine oxides have the potential of producing four radicals from one molecule. The aim of this study was to evaluated several critical properties of glass filled composites utilizing these two monomers with the two types of photoinitiator systems.

Proceedings Title

Proceedings, 6th International Biorelated Polymers Symposium and ACS Meeting

Volume

45

Issue

No. 2

Conference Dates

August 1, 2004

Conference Title

Biorelated Polymers Symposium

Pub Type

Conferences

Keywords

conversion, dental composites, flexural strength, photoinitators, photosenitizers

Citation

Richards, N. , Dickens, S. and Antonucci, J. (2004), Dental Polymeric Composites Activated With Camphorquinone or Diacyl Phosphine Oxide Photoinitiators, Proceedings, 6th International Biorelated Polymers Symposium and ACS Meeting (Accessed July 27, 2024)