Er,Cr:YSGG激光照射对牙本质与玻璃离子水门汀间抗剪切黏结强度影响的研究

Effects of Er,Cr:YSGG laser irradiation on shear bond strength between dentin and GICs

目的评价Er,Cr:YSGG激光照射对牙本质与玻璃离子水门汀间抗剪切黏结强度的影响。方法于2008年7月至12月,在中国医科大学口腔医院收集15颗因正畸拔除的无龋坏、无隐裂的完整离体前磨牙。将标本牙的颊侧与舌侧牙本质表面分别用Er,Cr:YSGG激光照射处理(实验组)和涡轮手机处理(对照组),经FX-Ⅱ玻璃离子水门汀充填及冷热循环后进行剪切力实验,计算标本牙的抗剪切黏结强度,体视显微镜下观察牙体组织的剪切断面。结果剪切力实验结果显示:实验组牙本质与充填材料间的抗剪切黏结强度显著高于对照组(P<0.05)。体视显微镜观察:实验组牙体组织的剪切断面凹凸不平,充填物残留更多;对照组则较光滑、平坦。结论Er,Cr:YSGG激光照射会增强牙本质与玻璃离子水门汀间的抗剪切黏结强度。

Objective The purpose of this study was to evaluate the effects of Er,Cr:YSGG laser irradiation on the shear bond strength between dentin and GICs. Methods Fifteen non-carious,intact,non-filled and extracted premolars were selected for this study. Two dentinal surface, one of them was prepared with the Er,Cr:YSGG laser system on the buccal surface, and the other one was produced on the lingual surface with a high-speed turbine. After being filled with FX and thermocycled 500 cycles,all specimens were tested in shear bond strength and then investigated by a stereomicroscope. Results The shear bond strength asscciated with Er,Cr:YSGG laser irradiation was significantly more than the strength obtained with high-speed turbine preparation(P<0.05). Stereomicroscope study showed less GIC materials and more smooth fracture section by bur on the prepared surfaces than by Er,Cr:YSGG laser. Conclusion Adopting Er,Cr:YSGG laser-cutting can enhance the shear bond strength between dentin and GICs.