Borges Boniek Castillo Dutra, de Assunção Isauremi Vieira, de Aquino Célia Avani, de Melo Monteiro Gabriela Queiroz, Gomes Anderson Stevens Leonidas
Department of Dentistry, Federal University of Rio Grande do Norte, Natal, RN, Brazil.
Dental School, University of Pernambuco, Camaragibe, PE, Brazil.
Int Dent J. 2016 Feb;66(1):23-8. doi: 10.1111/idj.12191. Epub 2015 Oct 18.
This study aimed to evaluate the influence of pre-photoactivation temperature on the marginal and internal integrity (occurrence of voids) of fissure-sealing materials on occlusal fissures using optical coherence tomography (OCT).
Occlusal fissures of 40 human third molars were sealed using a resin-based fissure sealant (Fluroshield) and a flowable composite (Permaflo) photoactivated at 68 °C (preheated) or at room temperature (25 °C) (n=10). After sealing, the teeth were subjected to thermocycling (500 cycles, 5-55 °C) and 14 days of pH cycling (demineralisation for 6 hours/day and remineralisation for 18 hours/day). The occlusal surfaces were scanned in a buccolingual direction, and 20 tomographic images parallel to the long axis of each tooth were obtained. Images presenting marginal gaps and internal voids were counted and statistically analysed using analysis of variance and Tukey's test (P<0.05).
There were statistically significant differences between materials and temperatures (P<0.01). The flowable composite had a lower percentage of gaps and internal voids than the resin-based sealant. Preheated materials had a lower percentage of gaps and internal voids than the materials at room temperature.
Therefore, preheated flowable composite provided the best marginal sealing of fissures, and internal homogeneity of the material.
本研究旨在使用光学相干断层扫描（OCT）评估光激活前温度对窝沟封闭材料在磨牙窝沟边缘及内部完整性（空隙出现情况）的影响。
使用树脂基窝沟封闭剂（Fluroshield）和可流动复合树脂（Permaflo）对40颗人类第三磨牙的窝沟进行封闭，光激活温度为68°C（预热）或室温（25°C）（每组n = 10）。封闭后，对牙齿进行热循环（500次循环，5 - 55°C）和14天的pH循环（每天脱矿6小时，再矿化18小时）。沿颊舌方向扫描咬合面，获取与每颗牙齿长轴平行的20张断层图像。对呈现边缘间隙和内部空隙的图像进行计数，并使用方差分析和Tukey检验进行统计分析（P < 0.05）。
材料和温度之间存在统计学显著差异（P < 0.01）。可流动复合树脂的间隙和内部空隙百分比低于树脂基封闭剂。预热材料的间隙和内部空隙百分比低于室温材料。
因此，预热的可流动复合树脂提供了最佳的窝沟边缘封闭以及材料内部均匀性。
