Study of visible light activated polymerization in BisGMA-TEGDMA monomers with Type 1 and Type 2 photoinitiators using Raman spectroscopy

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• 作者：Tritala K. Vaidyanathan^a ; ^{vaidyatk@hotmail.com} ; ^{vaidyatk@sdm.rutgers.edu} ; Jayalakshmi Vaidyanathan^a ; Pambadikandathil Philipose Lizymol^b ; Saraswathy Ariya^b ; Kalliyana Venketeswaran Krishnan^b
• 关键词：Type 1 and Type 2 initiators ; BisGMA based monomer ; % Conversion ; Raman spectroscopy
• 刊名：Dental Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：33
• 期：1
• 页码：1-11
• 全文大小：2728 K
• 卷排序：33

文摘

The goal of the study was to characterize the efficiency of polymerization of Type 1 and Type 2 initiators for visible light cure of a BisGMA-TEGDMA monomer mixture.MethodsRaman spectroscopy was used to follow conversion during polymerization of a BisGMA-TEGDMA mixture using a Type I photoinitiator diphenyl(2,4,6 dimethylbenzoyl)phosphine oxide (TPO) and a Type II photoinitiator camphorquinone (CQ) and an amine, both initiators at 0.5 wt.%. Different light exposure times and storage times after light curing were used as variables.ResultsThere was a significant difference between the relative exposure times of TPO and CQ/amine (5 s for TPO vs. 20 s for CQ/Amine) for attaining maximum % conversion (78% in TPO vs. 65% in CQ/Amine). There was also a significant difference in the effect of storage time (no effect in TPO vs. increased % conversion with CQ/Amine). These effects are attributed to differences in the rate controlling steps of free radical generation in Type 1/Type 2 initiators, and the potential for radiative and non-radiative energy losses in CQ/Amine in its excited state.ConclusionsThe results confirm that photo-polymerization of BisGMA is much more efficient with TPO than with CQ/amine. Both exposure and storage times were important variables in CQ/amine, but not in TPO.SignificanceTPO photolysis generates significantly more free radicals with potentially very little radiative and non-radiative energy loss in comparison with CQ/amine. The resulting improved monomer conversion is of major importance in resisting chemical and mechanical degradation and preventing toxicological adverse effects.