ProTaper简化预备法的根尖微渗漏实验研究

目的观察ProTaper简化预备法的根尖微渗漏,评价其根尖的封闭性能。方法 60颗离体成人患牙,分成2组。实验组30颗牙标本采用ProTaper机动系统简化预备和0.06锥度牙胶尖垂直加压充填根管,对照组30颗牙标本采用逐步后退法0.02锥度不锈钢锉预备和0.02锥度牙胶尖冷侧方加压充填根管,经透明标本染料渗透技术后,测量根尖部染料渗透的距离。结果实验组根尖染料的渗透距离均值0.60 mm,标准差0.29 mm,对照组根尖染料的渗透距离均值1.18 mm,标准差0.83 mm,2组根尖染料的渗透距离差异有统计学意义(P<0.05)。结论 ProTaper简化法预备根管配合相应锥度牙胶尖充填其根尖的封闭性能良好。

Experimental study on the apical microleakage with simplified rotary ProTaper preparation method

Objective To observe the apical microleakage with simplified rotary ProTaper preparation method and to evaluate the sealing ability of the root apex. Methods Sixty extracted human teeth were randomly divided into two groups. In the experimental group,the root canals of 30 teeth were prepared with simplified rotary ProTaper method and obturated by 0.06 taper gutta percha cones with vertical condensation technique. In the control group,the root canals of 30 teeth were prepared with O. 02 taper stainless steel files in step - back technique and obturated by O. 02 taper gutta percha cones with cold lateral condensation technique. All specimens were penetrated by the line dye and the distances of dye penetration in the roots apical linear extent were measured. Results In the experi- mental group,the average value of the apical linear extent of dye penetration was 0.60mm with the standard deviation of 0.29 mm. In the control group,the average value of the apical linear extent of dye penetration was 1.18 mm with the standard deviation of 0.83mm. There was significant difference in apical microleakage between two groups （ P 〈 0.05 ）. Conclusions The apical sealing effects of roots filled with simplified rotary ProTaper preparation method is good.