Introduction: The technique of sealing is a widely accepted procedure for prevention of caries. The aim of our in vitro study was to compare the effect of two different curing units (traditional LED source and innovative laser diode lamp) on the integrity of fissure sealant material and its interface with tooth enamel. Materials and methods: Sixty healthy third molars were randomly assigned to two groups. In group A were teeth intended for polymerization by LED B lamp, and group B comprised teeth to be polymerized by an innovative laser diode. Both groups were treated with the traditional sealing technique, subjected to a metallization process, and analyzed by scanning electron microscope. Results: Micro-gaps between the sealant and the enamel were found in specimens in both A (43%) and B (40%) groups (p=0.793), and sealant shrinkage was seen. Significant differences between the groups emerged in the percentage of perimetric micro-erosion sites (80% vs. 100%, p=0.010) and the presence of holes and micro-bubbles on the sealant surface (21% vs. 63%, p=0.001). Conclusions: Although macroscopic clinical polymerization occurred with both instruments, the microscopic evaluation showed significant differences between the studied groups in terms of perimetric micro-erosion sites and micro-bubbles, which were higher in laser-cured samples.

中文翻译：

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激光与 LED 聚合：体外预防性密封程序的比较

介绍：密封技术是一种被广泛接受的预防龋齿的方法。我们体外研究的目的是比较两种不同的固化装置（传统 LED 光源和创新激光二极管灯）对裂隙封闭剂材料及其与牙釉质界面完整性的影响。材料和方法：60 颗健康的第三磨牙随机分为两组。A 组是用于 LED B 灯聚合的牙齿，B 组是由创新的激光二极管聚合的牙齿。两组均采用传统密封技术处理，进行金属化处理，并通过扫描电子显微镜进行分析。结果：在 A (43%) 和 B (40%) 组 (p=0.793) 的标本中都发现密封胶和牙釉质之间存在微小间隙，并且观察到密封胶收缩。两组之间的显着差异表现在周边微侵蚀部位的百分比（80% 对 100%，p=0.010）以及密封剂表面上孔和微气泡的存在（21% 对 63%，p= 0.001）。结论：虽然两种仪器都发生了宏观临床聚合，但微观评估显示研究组之间在周边微侵蚀位点和微气泡方面存在显着差异，在激光固化样品中更高。