Peutzfeldt Anne, Lussi Adrian, Flury Simon
Department of Preventive, Restorative, and Pediatric Dentistry, School of Dental Medicine, University of Bern, Freiburgstrasse 7, 3010 Bern, Switzerland.
Biomed Res Int. 2016;2016:4894653. doi: 10.1155/2016/4894653. Epub 2016 Dec 4.
This study investigated the influence of light-curing at high irradiances on micromechanical properties of resin cements. Three dual-curing resin cements and a light-curing flowable resin composite were light-cured with an LED curing unit in Standard mode (SM), High Power mode (HPM), or Xtra Power mode (XPM). Maximum irradiances were determined using a MARC PS radiometer, and exposure duration was varied to obtain two or three levels of radiant exposure (SM: 13.2 and 27.2 J/cm; HPM: 15.0 and 30.4 J/cm; XPM: 9.5, 19.3, and 29.7 J/cm) ( = 17). Vickers hardness ( ) and indentation modulus () were measured at 15 min and 1 week. Data were analyzed with nonparametric ANOVA, Wilcoxon-Mann-Whitney tests, and Spearman correlation analyses ( = 0.05). Irradiation protocol, resin-based material, and storage time and all interactions influenced and significantly ( ≤ 0.0001). Statistically significant correlations between radiant exposure and or were found, indicating that high-irradiance light-curing has no detrimental effect on the polymerization of resin-based materials ( ≤ 0.0021). However, one resin cement was sensitive to the combination of irradiance and exposure duration, with high-irradiance light-curing resulting in a 20% drop in micromechanical properties. The results highlight the importance of manufacturers issuing specific recommendations for the light-curing procedure of each resin cement.
本研究调查了高辐照度光固化对树脂水门汀微观力学性能的影响。使用LED固化单元以标准模式（SM）、高功率模式（HPM）或超高功率模式（XPM）对三种双重固化树脂水门汀和一种光固化可流动树脂复合材料进行光固化。使用MARC PS辐射计测定最大辐照度，并改变曝光时间以获得两到三个辐射曝光水平（SM：13.2和27.2 J/cm²；HPM：15.0和30.4 J/cm²；XPM：9.5、19.3和29.7 J/cm²）（n = 17）。在15分钟和1周时测量维氏硬度（VH）和压痕模量（EIT）。数据采用非参数方差分析、Wilcoxon-Mann-Whitney检验和Spearman相关性分析进行分析（α = 0.05）。辐照方案、树脂基材料、储存时间以及所有相互作用均对VH和EIT有显著影响（P ≤ 0.0001）。发现辐射曝光与VH或EIT之间存在统计学显著相关性，表明高辐照度光固化对树脂基材料的聚合没有不利影响（P ≤ 0.0021）。然而，一种树脂水门汀对辐照度和曝光时间的组合敏感，高辐照度光固化导致微观力学性能下降20%。结果突出了制造商针对每种树脂水门汀的光固化程序发布具体建议的重要性。
