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Abstract：
OBJECTIVE: This study aimed to compare the two nickel-titanium (NiTi) instruments on root dentin thickness using cone-beam computed tomography (CBCT) and ability to remove the smear layer using scanning electron microscope (SEM).
METHODS: The effect of two NiTi rotary instruments such as XP Endo shaper and ProTaper Gold (PTG) in retaining adequate dentin thickness and debridement (i.e., removal of smear layer) was evaluated in vitro using CBCT and SEM. After cleaning and shaping of the root canal with adequate irrigation, the effect of two NiTi instrument systems at 3 mm (apical), 6 mm (middle), and 9 mm (coronal) levels on buccal, lingual, mesial, and distal aspects in terms of amount of dentin removal and smear layer removal was evaluated. The data were analyzed using student\'s unpaired t-test with a significance of P ≤ 0.05.
RESULTS: Both NiTi instrument systems had no statistically significant difference in amount of dentin removal at all three levels and on all four aspects. In smear layer removal, PTG had significantly better efficacy compared to XP Endo shaper at the coronal third of root canal.
CONCLUSIONS: Instrumentation with XP Endo Shaper and PTG showed a similar amount of dentin removal. PTG has a significant effect on smear layer removal compared to XP Endo Shaper only at the coronal third of root canal.
METHODS: The effect of two NiTi rotary instruments such as XP Endo shaper and ProTaper Gold (PTG) in retaining adequate dentin thickness and debridement (i.e., removal of smear layer) was evaluated in vitro using CBCT and SEM. After cleaning and shaping of the root canal with adequate irrigation, the effect of two NiTi instrument systems at 3 mm (apical), 6 mm (middle), and 9 mm (coronal) levels on buccal, lingual, mesial, and distal aspects in terms of amount of dentin removal and smear layer removal was evaluated. The data were analyzed using student\'s unpaired t-test with a significance of P ≤ 0.05.
RESULTS: Both NiTi instrument systems had no statistically significant difference in amount of dentin removal at all three levels and on all four aspects. In smear layer removal, PTG had significantly better efficacy compared to XP Endo shaper at the coronal third of root canal.
CONCLUSIONS: Instrumentation with XP Endo Shaper and PTG showed a similar amount of dentin removal. PTG has a significant effect on smear layer removal compared to XP Endo Shaper only at the coronal third of root canal.
摘要：
目的：本研究旨在使用锥形束计算机断层扫描（CBCT）比较两种镍钛（NiTi）仪器对牙根牙本质厚度的影响，以及使用扫描电子显微镜（SEM）去除涂抹层的能力。
方法：两种NiTi旋转仪器，例如XPEndoshaper和ProTaperGold（PTG）在保留足够的牙本质厚度和清创（即，使用CBCT和SEM在体外评估涂抹层的去除）。在充分冲洗的情况下清洁和塑造根管后，两个NiTi仪器系统在3毫米（根尖）的影响，6毫米（中间），和9毫米（冠状）水平在颊，语言,mesial,并评估了牙本质去除量和涂抹层去除量的远端方面。使用Student's非配对t检验对数据进行分析，P≤0.05。
结果：两种NiTi仪器系统在所有三个水平和所有四个方面的牙本质去除量均无统计学上的显着差异。在去除涂抹层中，与XPEndoshaper相比，在根管冠状三分之一处，PTG的疗效明显更好。
结论：使用XPEndoShaper和PTG的仪器显示出相似的牙本质去除量。与XPEndoShaper相比，PTG仅在根管冠状三分之一处对涂抹层去除具有显着影响。
方法：两种NiTi旋转仪器，例如XPEndoshaper和ProTaperGold（PTG）在保留足够的牙本质厚度和清创（即，使用CBCT和SEM在体外评估涂抹层的去除）。在充分冲洗的情况下清洁和塑造根管后，两个NiTi仪器系统在3毫米（根尖）的影响，6毫米（中间），和9毫米（冠状）水平在颊，语言,mesial,并评估了牙本质去除量和涂抹层去除量的远端方面。使用Student's非配对t检验对数据进行分析，P≤0.05。
结果：两种NiTi仪器系统在所有三个水平和所有四个方面的牙本质去除量均无统计学上的显着差异。在去除涂抹层中，与XPEndoshaper相比，在根管冠状三分之一处，PTG的疗效明显更好。
结论：使用XPEndoShaper和PTG的仪器显示出相似的牙本质去除量。与XPEndoShaper相比，PTG仅在根管冠状三分之一处对涂抹层去除具有显着影响。
