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Abstract：
OBJECTIVE: To investigate the effect of the hand file size on the accuracy of Root ZX (J. Morita Co., Kyoto, Japan) and iPex (NSK, Tochigi, Japan).
METHODS: Seventy-five single-rooted teeth were decoronated, and canals were coronally flared with Gates Glidden burs sizes 4, 3, and 2. Actual canal length was determined by averaging two readings obtained by inserting K-file size 8 until its tip was apparent at the most coronal border of the apical foramen. The reference length was actual length-0.5 mm. The blinded operator utilized Root ZX and iPex following the manufacturer\'s recommendations. Teeth were placed in sponge blocks soaked with Ringer\'s solution. Canals were irrigated with 5% sodium hypochlorite. K-file size 8 was attached to the lip clip and introduced until the APEX/0.0 mark, then withdrawn to the 0.5 mark. A stable meter gauge for five seconds indicated an acceptable reading. Readings with sizes 10 and 15 were obtained afterward. All measurements were done twice, then averaged. Data analysis was done using ANOVA and a posthoc Bonferroni test with the significance level set at P<0.05.
RESULTS: For Root ZX, the mean length with size 8 was not significantly different from the mean reference length (P=0.205). The same was found for its mean length at size 10 (P=0.093). However, the mean Root ZX length with size 15 was significantly shorter than the mean reference length (P=0.019). Mean iPex lengths with sizes 8, 10, and 15 were all significantly shorter than the mean reference length (P=0.038, 0.006, and 0.02, respectively).
CONCLUSIONS: The size of the hand file affected the precision of Root ZX and iPex.
METHODS: Seventy-five single-rooted teeth were decoronated, and canals were coronally flared with Gates Glidden burs sizes 4, 3, and 2. Actual canal length was determined by averaging two readings obtained by inserting K-file size 8 until its tip was apparent at the most coronal border of the apical foramen. The reference length was actual length-0.5 mm. The blinded operator utilized Root ZX and iPex following the manufacturer\'s recommendations. Teeth were placed in sponge blocks soaked with Ringer\'s solution. Canals were irrigated with 5% sodium hypochlorite. K-file size 8 was attached to the lip clip and introduced until the APEX/0.0 mark, then withdrawn to the 0.5 mark. A stable meter gauge for five seconds indicated an acceptable reading. Readings with sizes 10 and 15 were obtained afterward. All measurements were done twice, then averaged. Data analysis was done using ANOVA and a posthoc Bonferroni test with the significance level set at P<0.05.
RESULTS: For Root ZX, the mean length with size 8 was not significantly different from the mean reference length (P=0.205). The same was found for its mean length at size 10 (P=0.093). However, the mean Root ZX length with size 15 was significantly shorter than the mean reference length (P=0.019). Mean iPex lengths with sizes 8, 10, and 15 were all significantly shorter than the mean reference length (P=0.038, 0.006, and 0.02, respectively).
CONCLUSIONS: The size of the hand file affected the precision of Root ZX and iPex.
摘要：
目的：研究手文件大小对根ZX(J。森田公司,京都,日本）和iPex（NSK，Tochigi,日本）。
方法：对75颗单根牙齿进行了装饰，运河在冠状张开，分别为4、3和2号的盖茨·格利登博士。通过平均插入K文件大小8获得的两个读数，直到其尖端在根尖孔的最冠状边界处可见，来确定实际的运河长度。参考长度为实际长度-0.5mm。蒙蔽的操作员根据制造商的建议使用RootZX和iPex。将牙齿置于用Ringer溶液浸泡的海绵块中。用5%次氯酸钠灌溉运河。将K文件大小8附加到唇夹，并引入直到APEX/0.0标记，然后撤回到0.5标记。五秒的稳定仪表指示可接受的读数。之后获得尺寸为10和15的读数。所有的测量都做了两次,然后平均。使用ANOVA和posthocBonferroni检验进行数据分析，显著性水平设置为P<0.05。
结果：对于根ZX，大小为8的平均长度与平均参考长度无显著差异(P=0.205).其大小为10的平均长度也是如此(P=0.093)。然而,大小为15的ZX根的平均长度明显短于平均参考长度(P=0.019)。大小为8、10和15的平均iPex长度均显著短于平均参考长度(分别为P=0.038、0.006和0.02)。
结论：手动文件的大小会影响RootZX和iPex的精度。
方法：对75颗单根牙齿进行了装饰，运河在冠状张开，分别为4、3和2号的盖茨·格利登博士。通过平均插入K文件大小8获得的两个读数，直到其尖端在根尖孔的最冠状边界处可见，来确定实际的运河长度。参考长度为实际长度-0.5mm。蒙蔽的操作员根据制造商的建议使用RootZX和iPex。将牙齿置于用Ringer溶液浸泡的海绵块中。用5%次氯酸钠灌溉运河。将K文件大小8附加到唇夹，并引入直到APEX/0.0标记，然后撤回到0.5标记。五秒的稳定仪表指示可接受的读数。之后获得尺寸为10和15的读数。所有的测量都做了两次,然后平均。使用ANOVA和posthocBonferroni检验进行数据分析，显著性水平设置为P<0.05。
结果：对于根ZX，大小为8的平均长度与平均参考长度无显著差异(P=0.205).其大小为10的平均长度也是如此(P=0.093)。然而,大小为15的ZX根的平均长度明显短于平均参考长度(P=0.019)。大小为8、10和15的平均iPex长度均显著短于平均参考长度(分别为P=0.038、0.006和0.02)。
结论：手动文件的大小会影响RootZX和iPex的精度。
