...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >A mechanism on why slower polymerization of a dental composite produces lower contraction stress.
【24h】

A mechanism on why slower polymerization of a dental composite produces lower contraction stress.

机译：为何牙科复合材料的聚合反应较慢会产生较低的收缩应力的机理。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

It has been well documented that the rate of polymerization of a dental composite often affects its polymerization contraction stress. In most cases, a slower cure produces a lower stress. To investigate the mechanism behind this, we prepared an unfilled dimethacrylate resin sample and photocured it using two light irradiances, both with the same total irradiation energy. We measured the polymerization-induced shrinkage from the unbonded surface of a class I restoration, contraction stress, extent of polymerization, and flexural modulus. The resin specimens cured under the two irradiances achieved the same extent of polymerization and developed an identical amount of shrinkage from the unbonded surface. But those cured under the lower irradiance possessed a lower contraction stress and a lower flexural modulus than those cured under the higher irradiance. We demonstrated that the stress level did not respond to the extent of viscous flow of the curing resin because the slower polymerization did not produce more shrinkage from the unbonded surface. Instead, the lower stress is likely due to a lower modulus of the cured resin. To explain why the cured resin with an identical extent of polymerization can have different moduli, we proposed that slower polymerization produces a higher level of structural inhomogeneity, which reduces the rigidity of the cured resin.
机译：众所周知，牙科复合材料的聚合速率通常会影响其聚合收缩应力。在大多数情况下，较慢的固化会产生较低的应力。为了研究其背后的机理，我们制备了未填充的二甲基丙烯酸酯树脂样品，并使用两个总辐照能量相同的两个光辐照光固化了该样品。我们测量了由聚合引起的I类修复体未粘合表面的收缩，收缩应力，聚合程度和弯曲模量。在两种辐照下固化的树脂样品实现了相同程度的聚合，并从未结合的表面产生了相同量的收缩。但是在较低辐照度下固化的那些相比在较高辐照度下固化的那些具有较低的收缩应力和较低的挠曲模量。我们证明了应力水平对固化树脂的粘性流动程度没有响应，因为较慢的聚合反应不会从未结合的表面产生更多的收缩。相反，较低的应力可能是由于固化树脂的较低模量。为了解释为什么具有相同聚合度的固化树脂可以具有不同的模量，我们提出较慢的聚合会产生较高水平的结构不均匀性，这会降低固化树脂的刚性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号