METHODS: Composite resin FDPs for 99 standardized maxillary central incisors were fabricated according to nine parameters: three total convergence angles (4 [DG4], 12 [DG12], and 20 degrees [DG20]) and three cement space settings (10 [CS10], 50 [CS50], and 90 µm [CS90]). Internal space values were measured with a cement space replica technique. The Kruskal-Wallis and Steel-Dwass tests were used to evaluate differences in the total convergence angles and luting agent spaces, respectively (α = 0.05).
RESULTS: For all three cement spaces tested, the median marginal gap values between abutment teeth and FDPs decreased significantly as the total convergence angle increased (P < 0.05). For the CS10 and CS50 groups, the internal space values at the axial area increased significantly as the total convergence angles increased (P < 0.05).
CONCLUSIONS: Total convergence angles of the abutment teeth and cement spaces affected the marginal and internal adaptation of anterior FDPs fabricated with a CAD-CAM system.
方法:根据九个参数制造99个标准化上颌中切牙的复合树脂FDP:三个总会聚角(4[DG4],12[DG12],和20度[DG20])和三个水泥空间设置(10[CS10],50[CS50],和90µm[CS90])。用水泥空间复制技术测量内部空间值。使用Kruskal-Wallis和Steel-Dwass测试来评估总会聚角和剂量空间的差异,分别为(α=0.05)。
结果:对于所有三个测试的水泥空间,随着总收敛角的增加,基牙和FDP之间的中位边缘间隙值显着降低(P<0.05)。对于CS10和CS50组,随着总会聚角的增加,轴向区域的内部空间值显着增加(P<0.05)。
结论:基牙和骨水泥空间的总会聚角度影响了用CAD-CAM系统制造的前FDP的边缘和内部适应。