Paqué F, Barbakow F, Peters O A
Division of Endodontology, Department of Preventive Dentistry, Periodontology and Cariology, University of Zürich, Zürich, Switzerland.
Int Endod J. 2005 Jul;38(7):456-64. doi: 10.1111/j.1365-2591.2005.00968.x.
To evaluate the relative performance of Endo-Eze Anatomic Endodontic Technology (AET) stainless steel instruments when shaping maxillary molar root canals in vitro. Methodology Extracted human maxillary molars were scanned, before and after root canal shaping with Endo-Eze AET, employing micro-computed tomography (muCT) at an isotropic resolution of 34 microm. Three-dimensional root canal models were reconstructed and evaluated for volume, surface area, 'thickness' (diameter), canal transportation and prepared surface. Preparation errors such as apical zips, perforations and fractured instruments were visually determined from those models. Means were contrasted using anova and Scheffé post-hoc tests.
Volume and surface area increased significantly and similarly in mesiobuccal (mb), distobuccal (db) and palatal (p) canals and gross preparation errors (n = 17) were found. Mean root canal diameters, 5 mm coronal to the apex, increased from 0.31 to 0.52, 0.35 to 0.50 and 0.50 to 0.70 mm for mb, db and p canals, respectively. Mean canal transportation ranged from 0.15 to 0.29, 0.15 to 0.27 and 0.21 to 0.33 mm for apical, middle and coronal root canal levels, respectively, with highest values found for mb canals (P < 0.003). Root canals were significantly straightened during preparation (P < 0.002).
In summary, Endo-Eze AET instruments shaped root canals in maxillary molars with substantial canal transportation, particularly in mesiobuccal root canals. Preparation with this instrument removed high volumes of dentine, even though apical preparation was size 30. Based on the current results, Endo-Eze AET cannot be recommended for the preparation of teeth with curved root canals.
评估Endo-Eze解剖学牙髓治疗技术（AET）不锈钢器械在体外对上颌磨牙根管进行预备时的相对性能。方法：在使用Endo-Eze AET进行根管预备前后，对拔除的人类上颌磨牙进行扫描，采用各向同性分辨率为34微米的微型计算机断层扫描（μCT）。重建三维根管模型，并对其体积、表面积、“厚度”（直径）、根管偏移和预备表面进行评估。从这些模型中直观地确定诸如根尖拉链、穿孔和器械折断等预备误差。使用方差分析和谢费尔事后检验对均值进行对比。
近中颊侧（mb）、远中颊侧（db）和腭侧（p）根管的体积和表面积均显著且相似地增加，并且发现了严重的预备误差（n = 17）。根尖上方5毫米处的根管平均直径，mb、db和p根管分别从0.31毫米增加到0.52毫米、从0.35毫米增加到0.50毫米以及从0.50毫米增加到0.70毫米。根尖、根管中部和冠部水平的平均根管偏移分别为0.15至0.29毫米、0.15至0.27毫米和0.21至0.33毫米，其中mb根管的值最高（P < 0.003）。根管在预备过程中显著变直（P < 0.002）。
总之，Endo-Eze AET器械在上颌磨牙根管预备中导致大量的根管偏移，尤其是在近中颊侧根管。使用该器械进行预备会去除大量牙本质，尽管根尖预备尺寸为30号。基于目前的结果，不建议使用Endo-Eze AET对弯曲根管的牙齿进行预备。
