Intrinsic 'soft-start' polymerisation shrinkage-kinetics in an acrylate-based resin-composite
Intrinsic 'soft-start' polymerisation shrinkage-kinetics in an acrylate-based resin-composite
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DOI：
10.1016/s0109-5641(99)00012-3
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发表时间：
1999-01-01
期刊：
影响因子：
5
通讯作者：
Al Hindi, A
中科院分区：
文献类型：
--
作者：
Watts, DC;Al Hindi, A
目的：基于多丙烯酸酯单体的树脂复合材料进行评估的任何差异设置收缩应变动力学相对于更传统的配方的基础上dimacrylate monomers.Methods：四种树脂复合材料进行了检查收缩应变超过60分钟的时间段，从最初的照射，使用“粘合盘”测量装置。一种材料用标准和两级（低到高）蓝光照射方案进行评价。在固定（正常）水平蓝光辐照下研究了试验材料（Solitaire）和其他两种对照品。在23 ℃和37 ℃下进行测量。结果：应用于一种二甲基丙烯酸酯复合物的低-强光照射导致高度显著的（p < 0.001）在最初的0.2分钟内收缩应变减少到最小水平。用丙烯酸酯复合材料进行固定水平的照射也导致形式上相同但内在的“软启动”收缩延迟状态;显著性为p < 0.001。在相同的固定水平光制度下的二甲基丙烯酸酯复合材料没有表现出收缩延迟。二甲基丙烯酸酯和多丙烯酸酯复合材料表现出在18-29%的范围内增加最终的平衡收缩-应变的增加标本temperature.Significance：在光固化剂的初始收缩率的减少可能有临床效益的恢复债券的完整性几乎一样重要的减少最终的平衡收缩-应变。这可以通过特殊的光照射方案（从低到高，或倾斜）或在有利的情况下通过新颖的单体复合物制剂和固化化学（例如Solitaire）来实现。粘合盘收缩应变测量技术适用于阐明光聚合固化过程中的快速动力学和温度依赖性事件。(C)1999年牙科材料学院。由爱思唯尔科技有限公司出版。保留所有权利。
Objectives: A resin-composite based on multi-acrylate monomers was to be evaluated for any differences in the setting shrinkage-strain kinetics relative to more conventional formulations based on di-methacrylate monomers.Methods: Four resin-composites were examined for shrinkage-strain over time periods up to 60 min, from initial irradiation, using a 'bonded disk' measurement device. One material was evaluated with a standard and also a two-level (low to high) blue light irradiation regime. The test material (Solitaire), and the other two controls were studied under fixed-(normal) level irradiation by blue light. Measurements were made at 23 and 37 degrees C.Results: The low-high light irradiation applied to one di-methacrylate composite led to a highly significant (p < 0.001) reduction in shrinkage-strain to a minimal level for the initial 0.2 min. The fixed-level irradiation with the acrylate-composite also led to a formally identical, but intrinsic 'soft-start' shrinkage-delay regime; significant at p < 0.001. Di-methacryate composites under the same fixed-level light regime did not exhibit shrinkage delay. Both di-methacrylate and multi-acrylate composites exhibited increases in the range 18-29% in final equilibrium shrinkage-strain by increase of specimen temperature.Significance: Reductions in the rate of initial shrinkage of light-cured restoratives may have clinical benefits for restoration bond-integrity nearly as important as reductions in the final equilibrium shrinkage-strain. This may be achieved either by special light irradiation regimes (low to high, or ramped) or in favourable cases by novel monomer-composite formulations and setting chemistry (e.g. Solitaire). The bonded disk shrinkage-strain measurement technique is suitable for the elucidation of such rapid kinetic and temperature-dependent events during photo-polymerisation setting processes. (C) 1999 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.