Annerstedt A, Engström U, Hansson A, Jansson T, Karlsson S, Liljhagen H, Lindquist E, Rydhammar E, Tyreman-Bandhede M, Svensson P, Wandel U
Department of Prosthetic Dentistry, Faculty of Odontology, Göteborg University, Sweden.
Acta Odontol Scand. 1996 Apr;54(2):109-12. doi: 10.3109/00016359609006014.
The convergence angle in 478 full crown preparations was assessed. Of these preparations, 351 had been performed by general practitioners and 127 by dental students. Groups of preparations performed on incisors, premolars, and molars were compared, as were preparations performed by dentists and students. Two different convergence angles were measured for each tooth, buccolingually and mesiodistally. The results showed a mean angle of 21 degrees. The mean values for premolars and molars differed significantly. When a comparison was made of preparations performed by students, a significant difference was found between premolars and molars. The same comparison for general practitioners showed a significant difference both for incisors compared with molars and for premolars compared with molars. A wide range was found for the convergence of the axial walls, especially for the preparations performed by general practitioners.
对478例全冠修复体预备体的聚合角进行了评估。在这些预备体中，351例由全科医生完成，127例由牙科学生完成。对在切牙、前磨牙和磨牙上进行的预备体组进行了比较，同时也比较了牙医和学生所完成的预备体。对每颗牙齿在颊舌向和近远中向测量了两种不同的聚合角。结果显示平均角度为21度。前磨牙和磨牙的平均值有显著差异。在比较学生完成的预备体时，发现前磨牙和磨牙之间存在显著差异。对全科医生完成的预备体进行同样的比较时，发现切牙与磨牙之间以及前磨牙与磨牙之间均存在显著差异。轴向壁的聚合度范围较宽，尤其是全科医生完成的预备体。
