Optimizing the concentration of 2,4,6-trimethylbenzoyldiphenylphosphine oxide initiator in composite resins in relation to monomer conversion

Vesna Miletic, Ario Santini*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of this study was to optimize the concentration of 2,4,6-trimethylbenzoyldiphenylphosphine oxide (Lucirin (R) TPO) in unfilled and filled composite resins in relation to the degree of conversion (DC). Increasing concentrations of Lucirin (R) TPO between 0.05-4.97 wt% were added to equimolar mixtures of Bis-GMA/TEGDMA. Filled resins contained 75 wt% fillers. Standardized samples were cured using a polywave LED light-curing unit (bluephase (R) G2, Ivoclar Vivadent). Increased initiator concentrations increased logarithmically the DC of unfilled and filled resins. The DC of unfilled resins was in the range of 73-91% at the top and 63-81% at the bottom surfaces and that of filled resins was in the range of 53-81% at the top and 47-70% at the bottom surfaces. The DC in unfilled and filled resins reached a plateau at 1.08 wt% and 1.50 wt% Lucirin (R) TPO, respectively. Fillers significantly reduced conversion but had no effect on the logarithmic relationship between initiator concentration and the DC.

Original languageEnglish
Pages (from-to)717-723
Number of pages7
JournalDental materials journal
Volume31
Issue number5
DOIs
Publication statusPublished - Sep 2012

Keywords

  • SPECTROSCOPY
  • HYDROPHILICITY
  • BLENDS
  • EFFICIENCY
  • ADHESIVES
  • Lucirin (R) TPO
  • Light curing unit
  • Raman
  • LIGHT CURING UNITS
  • DENTAL PHOTOINITIATORS
  • POLYMERIZATION
  • CURED RESIN
  • Composite
  • Degree of conversion

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