Effect of different photoinitiator systems on conversion profiles of a model unfilled light-cured resin
Effect of different photoinitiator systems on conversion profiles of a model unfilled light-cured resin
复制标题
DOI：
10.1016/j.dental.2006.11.010
复制
发表时间：
2007-10-01
期刊：
影响因子：
5
通讯作者：
Vallo, Claudia I.
中科院分区：
文献类型：
--
作者：
Schroeder, Walter F.;Vallo, Claudia I.
Objective.本研究的目的是比较不同的蒽醌/胺光引发体系的光聚合效率。Bis-GMA/TEGDMA为基础的模型牙科树脂。在含有不同类型和浓度的光引发剂的树脂中测量单体转化率与曝光时间的关系，并进行不同的照射程序。光聚合过程中的转化率曲线。使用近红外光谱（NIR）进行了研究。将CQ与不同浓度的甲基丙烯酸二甲氨基乙酯（DMAEMA）、4-二甲氨基苯甲酸乙酯（EDMAB）、4-（N，N-二甲氨基）苯乙醇（DMOH）和N，N-3，5-四甲基苯胺（TMA）联合使用。从转化率曲线看，各胺的促进能力的近似顺序为EDMAB、DMPOH > TMA > DMAEMA。所有树脂的转化曲线对光照时间敏感。对于给定的曝光时间，通过顺序照射固化的样品导致比通过连续照射固化的样品更低的转化率。这些结果归因于光效应和热效应的组合。近红外光谱被证明是一种方便的方法来跟踪牙科树脂光聚合过程中的单体转化率的演变，因此，它是一种非常实用的方法，用于确定不同的光引发剂的相对功效。DMPOH/过氧化苯甲酰氧化还原体系最近被提出作为用于丙烯酸树脂聚合的生物相容性更好的加速剂。本研究中获得的结果揭示了DMOH胺在光固化牙科复合材料中的潜在用途。(C)2006年，牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objective. The aim of this study was to compare the efficiency of different camphorquinone (CQ)/amine photo -initiating systems for the photopolymerization. of a model dental resin based in Bis-GMA/TEGDMA.Methods. The monomer conversion versus exposure time was measured in resins containing different types and concentrations of photoinitiators and subjected to different irradiation procedures. The conversion profiles during photopolymerization. were investigated using near-infrared spectroscopy (NIR). CQ was used in combination with dimethylaminoethylmethacrylate (DMAEMA), ethyl-4-dimethylaminobenzoate (EDMAB), 4-(N,N-dimethylamino)phenethyl alcohol (DMPOH), and N,N-3,5-tetramethylaniline (TMA) at different concentrations.Results. From the conversion profiles, the approximate order of the accelerating ability of the respective amines were EDMAB, DMPOH > TMA > DMAEMA. The conversion profiles of all resins were sensitive to the illumination period. For a given exposure time, samples cured by sequential illumination resulted in lower conversion than samples cured by continuous irradiation. These results were attributed to a combination of both photo and thermal effects. NIR demonstrated to be a convenient method to follow the evolution of the monomer conversion during the photopolymerization of dental resins and, consequently, it is of great utility as a method for determining the relative efficacy of different photoinitiator.Significance. The DMPOH/benzoyl peroxide redox system, has been recently proposed as a more biocompatible accelerator for the polymerization of acrylic resins. The results obtained in the present study reveal the potential usefulness of the DMPOH amine in light-cured dental composites. (C) 2006 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.