van Dijken Jan W V, Lindberg Anders
Department of Odontology, Dental School Umeå, Umeå University, Umeå, Sweden.
J Adhes Dent. 2009 Apr;11(2):143-8.
To study the durability of a recently developed low-shrinkage resin composite, suggested to counter the stress formation in direct resin composite restorations.
Each of 50 patients received one or two pair(s) of Class II restorations. The first restoration in the pair was a low-shrinkage resin composite (InTen-S) and the second a hybrid resin composite restoration (Point 4). Both restorations were placed with an etch-and-rinse bonding system and an oblique layering technique. A total of 106 restorations, 33 premolar and 73 molars, were placed. The restorations were evaluated annually.
At 5 years, 97 restorations were evaluated. Two participants reported slight postoperative sensitivity symptoms for a few weeks after placement. Twelve non acceptable restorations were observed during the 5 years, five InTen-S (10.4%) and 7 Point 4 (14.3%) (not significant). Secondary caries was the main reason for failure (8) followed by composite fracture (2) and tooth fracture (2).
The low-shrinkage resin composite showed good durability, but not significantly better than the control resin composite in Class II cavities. Most failures occurred at the last part of the study. Secondary caries was the main reason for failure.
研究一种最近研发的低收缩树脂复合材料的耐久性，该材料旨在应对直接树脂复合材料修复体中的应力形成问题。
50名患者每人接受一对或两对II类修复体。每对中的第一个修复体使用低收缩树脂复合材料（InTen-S），第二个使用混合树脂复合材料修复体（Point 4）。两种修复体均采用酸蚀冲洗粘结系统和斜向分层技术进行放置。共放置了106个修复体，其中33个为前磨牙修复体，73个为磨牙修复体。每年对修复体进行评估。
5年后，对97个修复体进行了评估。两名参与者报告在修复体放置后的几周内出现了轻微的术后敏感症状。在5年期间观察到12个不合格修复体，其中5个InTen-S修复体（10.4%）和7个Point 4修复体（14.3%）（无显著差异）。继发龋是失败的主要原因（8例），其次是复合材料折断（2例）和牙齿折断（2例）。
低收缩树脂复合材料显示出良好的耐久性，但在II类洞型中并不显著优于对照树脂复合材料。大多数失败发生在研究的最后阶段。继发龋是失败的主要原因。
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