Lopes Julia Godoi, Rodrigues Jeneffer Vieira, Ramirez Iago, Camargo Rafael Verardino de, Leoni Graziela Bianchi, Sousa-Neto Manoel Damião, Lopes-Olhê Fabiane Carneiro, Mazzi-Chaves Jardel Francisco
Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, São Paulo, Brazil.
School of Dentistry, University of Ribeirão Preto, Ribeirão Preto, São Paulo, Brazil.
J Endod. 2025 Mar;51(3):348-358. doi: 10.1016/j.joen.2024.12.012. Epub 2024 Dec 20.
This study aimed to evaluate, using microcomputed tomography, the impact of various mechanized systems on the geometry of the root canal system and dentin thickness in mandibular first molars. The hypothesis proposed that different systems would produce significant variations in root canal system preparation.
Mesial and distal canals of mandibular molars were selected and divided into 5 groups (n = 10) based on the system used: 2Shape (25.06), Reciproc Blue (25.08), ProTaper Ultimate (25.08), ProTaper Next (25.06), and Univy New (25.06). Biomechanical preparation was performed following each manufacturer's instructions. Microcomputed tomography scans were conducted before and after preparation to assess 3-dimensional parameters (volume, surface area, Structural Model Index, and prepared root canal walls) and 2-dimensional parameters (area, perimeter, diameters, roundness, and transportation).
ProTaper Ultimate exhibited the greatest volume increase in mesial canals (1.73 ± 0.19), while ProTaper Next demonstrated the highest increase in distal canals (1.95 ± 0.25). Furthermore, ProTaper Ultimate resulted in the greatest dentin removal and the largest postpreparation area. Reciproc Blue achieved the best results for roundness and had the lower unprepared walls (15.3 ± 6.97).
All systems produced comparable outcomes, with ProTaper Ultimate yielding the greatest volume increase and dentin removal, indicating a less conservative preparation. Reciproc Blue provided optimal roundness and minimized unprepared root canal wall surfaces.
本研究旨在使用微型计算机断层扫描技术评估各种机械系统对下颌第一磨牙根管系统几何形状和牙本质厚度的影响。提出的假设是不同系统在根管系统预备中会产生显著差异。
选择下颌磨牙的近中根管和远中根管，并根据使用的系统分为5组（n = 10）：2Shape（25.06）、Reciproc Blue（25.08）、ProTaper Ultimate（25.08）、ProTaper Next（25.06）和Univy New（25.06）。按照各制造商的说明进行生物力学预备。在预备前后进行微型计算机断层扫描，以评估三维参数（体积、表面积、结构模型指数和预备后的根管壁）和二维参数（面积、周长、直径、圆度和偏移）。
ProTaper Ultimate在下颌磨牙近中根管中表现出最大的体积增加（1.73±0.19），而ProTaper Next在远中根管中表现出最高的体积增加（1.95±0.25）。此外，ProTaper Ultimate导致最大的牙本质去除量和预备后最大的面积。Reciproc Blue在圆度方面取得了最佳结果，且未预备壁的比例较低（15.3±6.97）。
所有系统产生的结果相当，ProTaper Ultimate产生的体积增加和牙本质去除量最大，表明其预备方式不太保守。Reciproc Blue提供了最佳的圆度，并使未预备的根管壁表面最小化。
