Mirzaie Mansoreh, Yassini Esmael, Etemadi Ardavan, Tavakoli Atefeh, Chiniforush Nasim
Restorative Dentistry Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
periodontics department, Azad University of Medical Sciences, Dental Branch.
Laser Ther. 2016 Oct 1;25(3):215-220. doi: 10.5978/islsm.16-OR-18.
This study evaluated the micro-tensile bond strength of new and previous composite resin restorations after surface treatment with diamond bur and Er,Cr:YSGG laser at different power settings (2,3 and 4 W). Micro-hybride composite resin was inserted in metallic mold 5 ×5 ×15 mm and cured for 40 sec according to manufacturer's instruction.12 blocks were made. The bonded surfaces of the 12 blocks so obtained were subsequently ground using Silicon Carbide papers 1200 grit, for 15 seconds under running water. Then the samples randomly were divided into 4 groups: (G1) Bur-treated, (G2) Er,Cr:YSGG laser with power of 2 W and energy of 100 mJ, (G3) Er,Cr:YSGG laser with power of 3 W and energy of 150 mJ, (G4) Er,Cr:YSGG laser with power of 4 W and energy of 200 mJ. One sample of each group was analyzed by SEM while, after cutting the blocks to 1 mm of area samples, the others samples were mechanically tested by Universal testing machine with the speed of 0.5 mm per minute till fracture point. Data were analysed using One-Way ANOVA and Tukey Test. T-test showed no significantly differences between G2 and G4(P=0.064) while G3 demonstrated significant differences than G2 (P=0.001) and G4(P=0.000) and also between samples treated with bur (G1) and G2 (P=0.242) ,G3 (P=0.000) ,G4 (P=0.829); G1 didn't significantly differ to G2 and G4(P>0.05), while G1 and G3(P<0.05). On surface treatment of repaired composite, samples treated by laser at 3W power showed better condition of micro-tensile bond strength.
本研究评估了在使用不同功率设置（2W、3W和4W）的金刚石车针和Er,Cr:YSGG激光进行表面处理后，新型和先前复合树脂修复体的微拉伸粘结强度。将微混合复合树脂插入5×5×15mm的金属模具中，并根据制造商的说明固化40秒。制作了12个试件。随后，使用1200目碳化硅砂纸在流水下对所得12个试件的粘结表面进行打磨15秒。然后将样本随机分为4组：（G1）车针处理组，（G2）功率为2W、能量为100mJ的Er,Cr:YSGG激光组，（G3）功率为3W、能量为150mJ的Er,Cr:YSGG激光组，（G4）功率为4W、能量为200mJ的Er,Cr:YSGG激光组。每组取一个样本进行扫描电子显微镜（SEM）分析，同时将试件切割成面积为1mm的样本后，其他样本用万能试验机以每分钟0.5mm的速度进行力学测试直至断裂点。数据采用单因素方差分析和Tukey检验进行分析。T检验显示G2和G4之间无显著差异（P=0.064），而G3与G2（P=0.001）和G4（P=0.000）之间存在显著差异，并且在用车针处理的样本（G1）与G2（P=0.242）、G3（P=0.000）、G4（P=0.829）之间；G1与G2和G4无显著差异（P>0.05），而G1和G3之间存在显著差异（P<0.05）。在修复复合树脂的表面处理中，3W功率激光处理的样本显示出更好的微拉伸粘结强度状况。
