Department of Restorative Dental Sciences, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia.
Department of Preventive Dental Sciences, Dar Al Uloom University Al Mizan St, Al Falah, Riyadh 13314, Saudi Arabia.
Photodiagnosis Photodyn Ther. 2018 Jun;22:34-38. doi: 10.1016/j.pdpdt.2018.02.019. Epub 2018 Feb 24.
The aim was to evaluate the influence of Er, Cr: YSGG laser therapy at different pulse frequency and power levels on the bond strength and microleakage of bleached enamel. One hundred samples were bleached using in-office whitening agent. Bleached samples were divided into six subgroups, four subgroups was based on laser application parameters (pulse frequency 50 and 30 Hz; Power 4.5 & 6 W) one subgroup was treated with bleach (B) and the other was control (no bleaching, no laser application). All specimens including control were etched with 37% phosphoric acid and composite build-ups were performed. Ten specimens from all the groups (B: Bleach only, L1: 50 Hz-4.5 W, L2: 50 Hz-6 W, L3: 30 Hz-4.5 W, L4:50 Hz-6W & C: Control) were assessed for shear bond strength and microleakage scores. Ten samples from all groups were immersed in 2% methylene blue for 24 h and assessed under a digital microscope for microleakage. The lowest mean bond strength was achieved in bleached group (9.49 ± 0.95) and maximum bond strength was observed in control group (33.97 ± 0.86). The highest mean microleakage score was found in bleached specimens (group B) (630.32 ± 156.58) and the lowest in controls (group C) (36.66 ± 27.33). Among assessed laser frequency and power combinations, 4.5 W and 30 Hz frequency showed maximum adhesive bond integrity (high bond strength and low microleakage) for bleached enamel samples.
目的是评估 Er,Cr:YSGG 激光治疗在不同脉冲频率和功率水平对漂白牙釉质的粘结强度和微渗漏的影响。100 个样本使用诊室美白剂进行漂白。漂白后的样本分为六组，其中四组基于激光应用参数（脉冲频率 50Hz 和 30Hz；功率 4.5W 和 6W），一组用漂白剂（B）处理，另一组为对照（未漂白，未应用激光）。所有标本（包括对照）均用 37%磷酸酸蚀，复合堆积。从所有组中（B：仅漂白、L1：50Hz-4.5W、L2：50Hz-6W、L3：30Hz-4.5W、L4：50Hz-6W 和 C：对照）中选取 10 个样本进行剪切粘结强度和微渗漏评分评估。从所有组中选取 10 个样本浸泡在 2%亚甲蓝中 24 小时，在数字显微镜下评估微渗漏。漂白组的平均粘结强度最低（9.49±0.95），对照组的粘结强度最大（33.97±0.86）。漂白组的平均微渗漏评分最高（B 组）（630.32±156.58），对照组最低（C 组）（36.66±27.33）。在评估的激光频率和功率组合中，4.5W 和 30Hz 频率显示出对漂白牙釉质样本具有最大的粘结完整性（高粘结强度和低微渗漏）。
