不同参数铒:钇激光表面处理后纤维桩的黏结强度

Effect of surface treatment using Er:YAG laser with different parameters on the bond strength of fiber posts

背景:近年来,纤维桩和树脂核已经被广泛应用于修复已行根管治疗后的大面积牙体硬组织缺损,并取得了令人满意的效果。铒:钇铝石榴石激光(erbium:yttrium aluminum garnet laser,Er:YAG激光)是新型水动力激光系统,可以用于纤维桩的表面处理。但是关于Er:YAG激光表面处理对纤维桩黏结强度影响的实验研究国内外鲜有报道。目的:探讨不同参数Er:YAG激光进行表面处理对玻璃纤维桩与不同部位根管牙本质黏结强度的影响。方法:选择50颗新鲜拔除根长相近的单根管上颌中切牙,常规根管治疗后去除牙冠,完成根桩牙体预备后,黏固Para Post FIBER LUX玻璃纤维桩至根管内。根据黏固前桩表面处理方法,将50颗离体牙随机等分为5组:对照组、1.5,2.5,3.5和4.5 W ER:YAG激光照射组。对照组未进行表面处理,1.5,2.5,3.5和4.5 W ER:YAG激光照射组纤维桩分别以150,250,350和450 m J,频率为10 Hz,脉冲持续频率为100μs的Er:YAG激光进行表面处理60 s。结果与结论:纤维桩与牙本质间黏结强度均值牙颈部最大,根中部次之,根尖部最小。牙颈部黏结强度与根中部和根尖部之间差异有显著性意义(P<0.05);根中部与根尖部之间差异无显著性意义(P>0.05)。相同根管部位的黏结强度值均表现为4.5 W ER:YAG激光照射组最高,且与其他组比差异有显著性意义(P<0.05)。说明用4.5 W Er:YAG桩表面处理可提高纤维桩与根管牙本质的黏结强度,且根颈部黏结强度大于根中及根尖部。

BACKGROUND：Recent years, fiber posts and resin cores have been widely used in repairing the endodonticaly treated teeth with satisfactory effect. Erbium：yttrium aluminum garnet （Er：YAG） laser is a new type of water power laser system, which can be used for surface treatment of fiber posts. But studies on the effect of Er：YAG laser surface treatment on the bond strength of fiber posts are rarely reported. OBJECTIVE： To evaluate the effect of surface treatment utilizing Er：YAG laser irradiation with different parameters on the bond strength of fiber posts to root canal dentin. METHODS： Fifty human maxilary central incisors that had similar dimensions were used. After endodontic treatment, removal of the crown and canal preparation, ParaPost FIBER LUX glass fiber posts were cemented into the root canals. According to the method of surface treatment, 50 teeth were randomly divided into： no surface treatment as control group; four groups undergoing surface preparation with Er：YAG laser with four different power settings （150, 250, 350 and 450 mJ at 10 Hz for 60 s at 100-μs pulse duration）, named 1.5, 2.5, 3.5, and 4.5 W Er：YAG laser irradiation groups, respectively. RESULTS AND CONCLUSION： The mean bond strength values reduced from the cervical to the apical root canal, and the bond strength of the dental cervix was significantly different from that of middle and apical thirds （P 〈 0.05）, but there was no difference between the middle and apical thirds （P〉 0.05）. Regardless of the different part of the root slices, the bond strength was highest in the 4.5 W Er：YAG laser irradiation group, showing significant difference from other groups （P 〈 0.05）. These findings indicate that 4.5 W Er：YAG laser irradiation significantly increases the bond strength of the fiber posts to root canal dentin.