Karkehabadi Hamed, Shokri Abbas, Banitalebi Negar, Abbasi Roshanak
Department of Endodontics, Dental Research Center, Avicenna Institute of Clinical Sciences, Avicenna Health Research Institute, Hamadan University of Medical Sciences, Hamadan, Iran.
Dental Implants Research Center, Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran.
Int J Dent. 2025 Jan 4;2025:7245596. doi: 10.1155/ijod/7245596. eCollection 2025.
This study compared the apical transportation and centering ratio of ProTaper Next (PTN) and XP-endo Shaper (XPS) nickel titanium (NiTi) rotary files in curved root canals using cone beam computed tomography (CBCT). The current in vitro study involved the mesiobuccal canals of mesial roots in 44 extracted mandibular first molars that exhibited apical curvature ranging from 10° to 30°. Two experimental groups were randomly formed from the teeth ( = 22) and subjected to instrumentation with PTN and XPS. CBCT scans were performed before and after instrumentation on the teeth, and the apical transport and centering ratio were calculated at 3, 4, and 5 mm from the apex. Group comparisons were conducted using an independent -test with a significance level set at alpha = 0.05. Comparisons within groups did not reveal any statistically significant differences in the magnitude of canal transportation in the buccolingual (BL) and mesiodistal (MD) directions at any level from the apex, neither in the XPS group nor in the PTN group ( > 0.05). Canal transportation in both BL and MD directions was significantly greater in PTN than in XPS ( < 0.05). The centering ratio in the MD and BL directions was the same at 3, 4, and 5 mm from the apex in the PTN ( > 0.05) and also in the XPS ( > 0.05) groups. The centering ratio was significantly higher in XPS than in PTN ( < 0.05) except at 5 mm from the apex in the MD direction and 4 and 5 mm from the apex in the BL direction ( > 0.05). Both buccolingually and mesiodistally, PTN led to greater apical transport than XPS and also showed a lower centering ratio.
本研究使用锥形束计算机断层扫描（CBCT）比较了ProTaper Next（PTN）和XP-endo Shaper（XPS）镍钛（NiTi）旋转锉在弯曲根管中的根尖移位和定心率。当前的体外研究涉及44颗拔除的下颌第一磨牙近中根的近中颊根管，这些根管呈现出10°至30°的根尖弯曲。从这些牙齿中随机形成两个实验组（每组n = 22），并分别使用PTN和XPS进行根管预备。在牙齿预备前后进行CBCT扫描，并在距根尖3、4和5毫米处计算根尖移位和定心率。组间比较采用独立t检验，显著性水平设定为α = 0.05。组内比较未发现XPS组和PTN组在距根尖任何水平的颊舌（BL）和近远中（MD）方向根管移位幅度上有任何统计学显著差异（P > 0.05）。PTN组在BL和MD方向的根管移位均显著大于XPS组（P < 0.05）。在PTN组（P > 0.05）和XPS组（P > 0.05）中，距根尖3、4和5毫米处MD和BL方向的定心率相同。除了在MD方向距根尖5毫米处以及BL方向距根尖4和5毫米处（P > 0.05），XPS组的定心率显著高于PTN组（P < 0.05）。在颊舌向和近远中向，PTN均比XPS导致更大的根尖移位，并且定心率更低。
