Millich F, Jeang L, Eick J D, Chappelow C C, Pinzino C S
Department of Chemistry, University of Missouri-Kansas City, 64110, USA.
J Dent Res. 1998 Apr;77(4):603-8. doi: 10.1177/00220345980770041301.
The greatest problem with current dental composite systems is their polymerization shrinkage. Extensive work is being done by many investigators to alleviate this problem. Our approach has been to examine epoxy- and spiro-orthocarbonate (SOC)-based resins. The hypothesis to be tested in this study was that the cure characteristics of experimental visible-light-cured epoxy resin systems are governed by the types and concentrations of co-reactants and activators. Resin samples containing onium salt initiators and a thiozanthone sensitizer were successfully cured by means of either an experimental visible-light irradiation system or a commercially available dental lamp. Test resins consisted of di-epoxies alone or in combination, epoxy mixtures in combination with an SOC, or an epoxy in combination with a caprolactone-derived polyol. Significant findings were as follows: (a) Resins containing the SOC had longer cure times than their counterparts; (b) the optimum ratios of epoxy to polyol for most rapid cure were 50:50 or 60:40 under conditions tested; (c) resins containing TONE 305 polyol generally were faster to cure than those containing no polyol, or TONES 201 or 310; and (d) a resin mixture was found that had a cure time of 1 to 3 min when irradiated with a commercial dental lamp. Based on this exploratory study, it should be possible for clinically relevant cure times to be achieved for visible-light-cured epoxy-based resins by careful manipulation and optimization of key elements.
当前牙科复合树脂体系最大的问题是其聚合收缩。许多研究人员正在进行大量工作以缓解这一问题。我们的方法是研究基于环氧树脂和螺环原碳酸酯（SOC）的树脂。本研究要验证的假设是，实验性可见光固化环氧树脂体系的固化特性受共反应物和活化剂的类型及浓度支配。含有鎓盐引发剂和硫杂蒽酮敏化剂的树脂样品通过实验性可见光照射系统或市售牙科灯成功固化。测试树脂由单独的双环氧化合物或其组合、与SOC组合的环氧混合物，或与己内酯衍生多元醇组合的环氧树脂组成。重要发现如下：（a）含有SOC的树脂比其对应物的固化时间更长；（b）在测试条件下，最快速固化的环氧与多元醇的最佳比例为50:50或60:40；（c）含有TONE 305多元醇的树脂通常比不含多元醇或含有TONES 201或310的树脂固化更快；（d）发现一种树脂混合物在用市售牙科灯照射时固化时间为1至3分钟。基于这项探索性研究，通过仔细操控和优化关键要素，有可能实现可见光固化环氧树脂在临床上相关的固化时间。
