Ilday Nurcan Ozakar, Sagsoz Omer, Karatas Ozcan, Bayindir Yusuf Ziya, Çelik Neslihan
Department of Restorative Dentistry, University of Atatürk, Erzurum, Turkey.
J Conserv Dent. 2015 May-Jun;18(3):223-6. doi: 10.4103/0972-0707.157258.
The aim of the study is to evaluate temperature change in fiber-reinforced composite (FRC) resin photopolymerized with a light-emitting diode (LED) light-curing unit (LCU).
Forty dentine disks (1 mm thick and 8 mm diameter) were prepared from human molars. The FRC specimens (2 mm thickness and 8 mm diameter) consisted of polyethylene fiber (Construct (CT)) products or glass fiber (ever Stick (ES)) and one hybrid composite bonded to the dentin disks and polymerized with an LED LCU. Control groups were prepared using the hybrid composite. Temperature rise in dentine samples under the FRC bonded disks was measured using a K-type thermocouple, and data were recorded. Temperature change data were subjected to analysis of variance (ANOVA) and Duncan's test.
The results show that addition of fiber (one or two layers) did not change temperature rise values at any of the exposure times (P > 0.05). The CT fiber/two layer/40 s group exhibited the greatest temperature rise (5.49 ± 0.62) and the ES/one layer/10 s group the lowest rise (1.75 ± 0.32). A significant difference was observed in temperature rise measured during 10 and 20 s exposures (P < 0.05).
Maximal temperature rise determined in all groups was not critical for pulpal health, although clinicians need to note temperature rises during polymerization.
本研究旨在评估用发光二极管（LED）光固化机（LCU）光聚合的纤维增强复合材料（FRC）树脂中的温度变化。
从人类磨牙制备40个牙本质盘（1毫米厚，8毫米直径）。FRC标本（2毫米厚，8毫米直径）由聚乙烯纤维（Construct（CT））产品或玻璃纤维（ever Stick（ES））以及一种混合复合材料组成，该混合复合材料粘结到牙本质盘上并用LED LCU进行聚合。对照组使用混合复合材料制备。使用K型热电偶测量FRC粘结盘下方牙本质样本中的温度升高，并记录数据。对温度变化数据进行方差分析（ANOVA）和邓肯检验。
结果表明，添加纤维（一层或两层）在任何曝光时间下均未改变温度升高值（P>0.05）。CT纤维/两层/40秒组的温度升高最大（5.49±0.62），ES/一层/10秒组的温度升高最低（1.75±0.32）。在10秒和20秒曝光期间测量的温度升高存在显著差异（P<0.05）。
尽管临床医生在聚合过程中需要注意温度升高，但所有组中确定的最大温度升高对牙髓健康并不关键。
