【摘要】 目的 比较4种热处理镍钛根管锉预备重度弯曲树脂模拟根管根尖区成形能力。方法 使用ProTaper Universal、ProTaper Next、WaveOne Gold、Twisted File、HyFlex CM预备50个树脂模拟根管，记录预备时间，测量预备前后工作长度变化以及根尖区5mm范围根管偏移量。结果 预备时间差异有统计学意义（P<0.05）,ProTaper Universal根管预备时间最长，Twisted File预备时间最短。根管工作长度变化差异无统计学意义。5 mm范围内，HyFlex CM根管偏移量最低（P <0.05），在3 mm范围内，HyFlex CM和WaveOne Gold根管偏移量差异无统计学意义。结论 5种镍钛根管锉均能安全预备重度弯曲根管，4种热处理镍钛根管锉根尖区根管偏移程度显著小于传统合金镍钛器械, CM-丝和Gold-丝镍钛器械根管偏移程度最小，多支锉的HyFlex CM最适合重度弯曲根管的预备。更多还原

【Abstract】 Objective To compare the shaping abilities of four different heat-treated nickel-titanium endodontic files in preparing severely curved resin simulated root canals specifically at the apical region. Methods Fifty resin simulated root canals were prepared using ProTaper Universal, ProTaper Next, WaveOne Gold, Twisted File, and HyFlex CM. The preparation time, changes in working length before and after preparation, and canal deviation within the 5 mm range of the apex were recorded. Results There were statistically significant differences in preparation time(P<0.05), with ProTaper Universal taking the longest and Twisted File the shortest. There were no significant differences in the changes of working length. Within a 5 mm range, HyFlex CM had the lowest canal deviation(P<0.05); within a 3mm range, there were no significant differences in canal deviation between HyFlex CM and WaveOne Gold. Conclusions All five nickel-titanium rotary files were capable of safely preparing severely curved canals. The four heat-treated nickel-titanium files showed significantly less deviation in the apical region of the canals compared to traditional nickel-titanium instruments. The HyFlex CM and WaveOne Gold files showed the least deviation, with HyFlex CM being the most suitable for preparing severely curved canals due to its multiple-file system.更多还原