Simdar Narges, Bashardoust Nazanin, Jahangir Majid
Department of Endodontics, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
Department of Oral and Maxillofacial Pathology, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
Dent Res J (Isfahan). 2021 Dec 10;18:107. eCollection 2021.
Cleaning and shaping of root canals are essential steps for the success of endodontic therapy. This study compared two types of rotary files in oval-shaped root canals: XP-endo shaper (FKG, La Chaux-de- Fonds, Switzerland) and Mtwo (VDW, Germany, Munich) with regard to cleaning ability and canal preparation. Mtwo is a system of nickel-titanium files with S-shaped cross-sectional design and XP-endo shaper can change its shape according to the temperature.
This study was performed on 16 pairs of freshly extracted contralateral mandibular premolars with a single oval-shaped canal that were selected and divided into two groups according to the root canal instrumentation technique: XP-endo shaper and Mtwo. Then, each root cut into three coronal, middle and apical sections and processed for histologic evaluation of canal wall planning and the presence of debris. Sections were evaluated by using AutoCAD 2017 software. Statistical analysis was used to compare between both the groups using repeated measures multivariate analysis of variance with Bonferroni correction for comparison and independent sample -tests. The level of statistical significance was set at < 0.05.
With a statistically significant difference in the middle third, untouched area and area with debris in XP-endo shaper group were smaller (respectively = 0.013 and = 0.011). Despite the percentage difference between groups, there was not a statistically significant difference in other sections.
Statistically in the middle section of the oval-shaped canals, the XP-endo shaper performs better than the Mtwo rotary files.
根管清理和塑形是牙髓治疗成功的关键步骤。本研究比较了两种旋转锉在椭圆形根管中的应用：XP-endo shaper（FKG，瑞士拉绍德封）和Mtwo（VDW，德国慕尼黑），比较了它们的清洁能力和根管预备情况。Mtwo是一种具有S形横截面设计的镍钛锉系统，而XP-endo shaper可根据温度改变其形状。
本研究选取16对新鲜拔除的对侧下颌前磨牙，每颗牙均有单个椭圆形根管，根据根管预备技术分为两组：XP-endo shaper组和Mtwo组。然后，将每颗牙根切成冠部、中部和根尖部三段，进行组织学评估，观察根管壁预备情况和碎屑残留情况。切片使用AutoCAD 2017软件进行评估。采用重复测量方差分析并经Bonferroni校正进行组间比较，同时进行独立样本检验。统计学显著性水平设定为<0.05。
在统计学上，XP-endo shaper组中三分之一区域、未触及区域和有碎屑区域差异有统计学意义，且较小（分别为=0.013和=0.011）。尽管两组之间存在百分比差异，但其他节段差异无统计学意义。
在统计学上，在椭圆形根管的中间部分，XP-endo shaper的性能优于Mtwo旋转锉。
