Abstract：
OBJECTIVE: The aim of this study was to investigate the influence of different convergence angles of abutment teeth and different cement spaces on internal adaptation of anterior fixed dental prostheses (FDPs) fabricated with a computer-aided design-computer-aided manufacturing (CAD-CAM) system.
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.
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.
摘要：
目的：这项研究的目的是研究基牙的不同会聚角度和不同的骨水泥空间对计算机辅助设计-计算机辅助制造（CAD-CAM）系统制造的前固定假牙（FDP）内部适应的影响。
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。
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。
