King Faisal Specialist Hospital and Research Center, Department of Dentistry, Saudi Arabia.
Department of Restorative Dental Science, Operative Division, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Photodiagnosis Photodyn Ther. 2019 Mar;25:204-207. doi: 10.1016/j.pdpdt.2018.10.017. Epub 2018 Oct 26.
To explore the surface modification of dentin using Er,Cr:YSGG phototherapy and bonding system on the shear bond strength and microleakage scores at two different distances and times of laser irradiation.
Ninety disease-free third molars were collected for the experiment. The four laser groups were divided on the basis of non-contact mode distance and time of irradiation: Group-I: Distance of 1 mm with duration of 60 s; Group-II: Distance of 1 mm with duration of 120 s; Group-III: Distance of 2 mm with duration of 60 s and; Group-IV: Distance of 2 mm with duration of 120 s. The surface for control group (Group-EB: Etch & bond group) was treated with etch and rinse bonding regime. Specimens from all the groups were assessed for shear bond strength and microleakage scores. Samples from all groups were immersed in 2% methylene blue for 24 h and assessed under a digital microscope for microleakage.
The lowest bond strength and microleakage was observed in the control group EB. The maximum bond strength score was observed in Group-IV with mean scores 23.41 ± 1.83, while the maximum microleakage scores were observed in Group-II and Group-IV with mean scores 1.0 ± 0.36 and 1.0 ± 0.11, respectively. The lowest bond strength and microleakage among laser groups was observed in Group-II and Group-III, respectively. However, specimens in laser groups showed comparable bond strength and microleakge scores (p > 0.05). For bond strength and microleakage values, analysis of variance showed significant difference among the study groups (p < 0.001). Using Tukey post hoc test, bond strength and microleakage of laser groups showed statistically significant values than EB group.
Use of phototherapy using Er,Cr:YSGG for dentin surface treatment has the potential for clinical application in comparison to conventional conditioning technique. Increasing the distance of laser application and time of irradiation has significant effect on the shear bond strength and microleakage scores of dentin bonded to resin composite. However, further in-vitro analysis should be undertaken in order to prove such findings.
通过 Er,Cr:YSGG 光疗和粘结系统对牙本质进行表面改性，探讨在激光照射的两种不同距离和时间下，剪切粘结强度和微渗漏评分的变化。
本实验共收集了 90 颗无病第三磨牙。根据非接触模式的照射距离和时间，将四个激光组分为：I 组：距离 1mm，持续 60s；II 组：距离 1mm，持续 120s；III 组：距离 2mm，持续 60s；IV 组：距离 2mm，持续 120s。对照组（EB 组：酸蚀和粘结组）的表面用酸蚀冲洗粘结法处理。所有组的样本均进行剪切粘结强度和微渗漏评分。所有组的样本均浸入 2%亚甲蓝中 24 小时，然后在数字显微镜下评估微渗漏。
EB 组的粘结强度和微渗漏最低。IV 组的最大粘结强度评分，平均得分为 23.41±1.83，而 II 组和 IV 组的最大微渗漏评分分别为 1.0±0.36 和 1.0±0.11。激光组中粘结强度和微渗漏最低的是 II 组和 III 组。然而，激光组的标本显示出可比的粘结强度和微渗漏评分（p>0.05）。对于粘结强度和微渗漏值，方差分析显示研究组之间有显著差异（p<0.001）。使用 Tukey 事后检验，激光组的粘结强度和微渗漏值与 EB 组相比具有统计学意义。
与传统处理技术相比，使用 Er,Cr:YSGG 光疗对牙本质表面进行处理具有潜在的临床应用价值。增加激光应用的距离和照射时间对牙本质与树脂复合材料的粘结剪切强度和微渗漏评分有显著影响。然而，为了证明这些发现，还需要进行进一步的体外分析。
