Knezevic Alena, Demoli Nazif, Tarle Zrinka, Meniga Andrej, Sutalo Jozo, Pichler Goran
Department of Restorative Dentistry, School of Dental Medicine, University of Zagreb, Zagreb, Croatia.
Oper Dent. 2005 May-Jun;30(3):346-52.
Polymerization shrinkage is an unavoidable consequence of resin composite photopolymerization and is one of the most important factors in determining the clinical quality and durability of composite filling. Many different methods of measuring polymerization shrinkage are described in the literature. Digital laser interferometry is a method that enables direct observation of polymerization shrinkage in real time. This study used the digital holographic interferometry method to measure the linear polymerization contraction of composite materials: Tetric Ceram (Vivadent), Spectrum TPH (Dentsply) and Valux Plus (3M Dental Products) polymerized with three different curing modes of the Elipar Trilight (ESPE) halogen curing unit. The highest polymerization contraction was recorded by "standard mode" (ETS) (1.24 +/- 2.66% lin), and the lowest by "medium mode" (ETM) (0.40 +/- 0.41% lin) during 40 second illumination. The "exponentional mode" (ETE) showed the highest expansion during the first 10 seconds of illumination. Curing units with initial low intensity enable better inner adaptation of composite material, preventing the detachment of material from dentin during polymerization and avoiding the negative consequences of polymerization shrinkage.
聚合收缩是树脂复合材料光聚合不可避免的结果，也是决定复合充填临床质量和耐久性的最重要因素之一。文献中描述了许多测量聚合收缩的不同方法。数字激光干涉测量法是一种能够实时直接观察聚合收缩的方法。本研究采用数字全息干涉测量法测量复合材料（义获嘉瓷化树脂、斯派克特TPH、3M牙科产品公司的Valux Plus）在依丽帕Trilight（爱士康）卤素固化灯三种不同固化模式下聚合时的线性聚合收缩。在40秒光照期间，“标准模式”（ETS）记录的聚合收缩率最高（1.24±2.66%线性），“中等模式”（ETM）记录的最低（0.40±0.41%线性）。“指数模式”（ETE）在光照的前10秒显示出最高的膨胀率。初始强度较低的固化灯能使复合材料更好地实现内部适配，防止聚合过程中材料与牙本质分离，并避免聚合收缩带来的负面影响。
