Pagavino G, Pace R, Baccetti T
Department of Endodontics, University of Florence, Italy.
J Endod. 1998 Jun;24(6):438-41. doi: 10.1016/S0099-2399(98)80029-0.
Twenty-nine unprepared, vital teeth were used to evaluate the accuracy of the Root ZX in locating the root canal foramen. After extraction of the teeth, a scanning electron microscope analyzed the relation of the file tip to the foramen. The sample was divided into two groups (Group A and Group B) according to the presence of a normal apical foramen (along the root main axis) or of a lateral foramen (deviating from the root main axis). With a tolerance level of +/- 0.5 mm, a clinical accuracy rate of 82.75% was recorded in the total sample. With a +/- 1.0-mm tolerance level, an accuracy of 100% was found. The error in locating the apex was significantly smaller in cases with a normal apical foramen (Group A) than in cases with a lateral foramen (Group B) (p < 0.001). An accuracy of 100% at the +/- 0.5-mm tolerance level was registered in Group A.
使用29颗未经处理的活髓牙来评估Root ZX定位根管口的准确性。牙齿拔除后，用扫描电子显微镜分析锉尖与根管口的关系。根据根尖孔（沿牙根主轴）或侧支根管（偏离牙根主轴）的情况将样本分为两组（A组和B组）。在±0.5毫米的公差水平下，总样本的临床准确率为82.75%。在±1.0毫米的公差水平下，准确率为100%。根尖孔正常的病例（A组）在根尖定位的误差明显小于有侧支根管的病例（B组）（p<0.001）。A组在±0.5毫米公差水平下的准确率为100%。
