PDF(Pubmed)
Abstract：
Introduction: The present study aimed to test the efficiency of photoinduced photoacoustic streaming using 2940 nm Er: YAG laser and 980 nm diode laser agitation on smear layer removal, sealer penetration and push-out bond strength. Methods: Sixty single canaled human permanent teeth were collected for this study. Specimens were grouped into three experimental groups (20 teeth in each group), depending on the activation protocol used for final irrigation: Group I (needle agitation), group II (980nm diode laser agitation) and group III (photon induced photoacoustic streaming (PIPS) using 2940 nm Er: YAG laser. The quantity of irrigant was standardized in all groups to 4 ml. The irrigant was activated for 40 seconds in different groups under continuous flow. Two teeth from each group were used to check the smear layer removal, and then the remaining teeth in each group were randomly divided into three equal experimental subgroups according to methods of evaluation used: subgroup A: Sealing ability evaluated by dye penetration method; subgroup B: SEM for sealer penetration; and subgroup C: Push-out bond strength assessed by the universal test machine. Results: As regards smear layer removal, results showed that the PIPS group had opened dentinal tubules, followed by the diode laser group, while the least cleaning effect was found in the Side-vented needle group. As for Sealing ability and dye penetration, a statistically significant difference was found between all of the three groups, with the Er:YAG laser (PIPS) having the best sealing ability and sealer penetration. Push-out bond strength results showed no statistically significant difference between diode and Er:YAG groups, with a significant difference between each of them and the Side-vented needle group. Conclusion: Using the diode or Er:YAG laser (PIPS) for irrigant activation led to better irrigant penetration and smear layer removal which subsequently led to obvious sealer penetration, better sealing, and strength properties of endodontic treated teeth.
摘要：
简介：本研究旨在测试使用2940nmEr：YAG激光和980nm二极管激光搅动去除涂抹层的光诱导光声流的效率，密封剂渗透和推出粘结强度。方法：本研究收集了60颗单根人恒牙。将标本分为三个实验组（每组20颗牙齿），取决于用于最终冲洗的激活方案：第I组（针头搅动），II组（980nm二极管激光搅动）和III组（使用2940nmEr：YAG激光的光子诱导光声流动（PIPS）。所有组的冲洗剂的量标准化为4ml。在连续流动下,在不同组中将冲洗剂活化40秒。每组两颗牙齿用于检查涂抹层的去除情况，然后将每组中的剩余牙齿根据使用的评估方法随机分为三个相等的实验亚组:亚组:通过染料渗透法评估的密封能力;亚组B:用于密封剂渗透的SEM;亚组C:通过万能试验机评估的推出粘结强度。结果：关于去除涂抹层，结果表明，PIPS组牙本质小管开放，其次是二极管激光器组，而侧向通气针组的清洁效果最小。至于密封能力和染料渗透，三组之间的差异有统计学意义，Er：YAG激光器（PIPS）具有最佳的密封能力和密封剂穿透性。推出粘结强度结果显示二极管和Er：YAG组之间无统计学差异，它们各自与侧通气针组之间存在显着差异。结论：使用二极管或Er：YAG激光（PIPS）进行冲洗剂激活导致更好的冲洗剂渗透和涂抹层去除，随后导致明显的密封剂渗透，更好的密封，牙髓治疗牙齿的强度特性。
