Department of Prosthodontics, Sivas Cumhuriyet University, Sivas, Turkey.
J Prosthodont. 2023 Aug;32(7):594-601. doi: 10.1111/jopr.13596. Epub 2022 Sep 30.
To evaluate the fatigue resistance of computer-aided design and computer-aided manufacturing (CAD-CAM) single-ceramic crowns which were applied on angled implant abutments after thermomechanical aging.
Titanium abutments (N = 72, MODE Medical Dental Implant, Turkey) with three different angles (0˚, 15°, and 25°) were restored using different materials (monolithic zirconia [Zir], lithium silicate ceramic reinforced by zirconia [VS], and hybrid ceramic [VE]). Crowns in the maxillary first premolar form were cemented to abutments using resin cement (Panavia 2.0 Introkit). Dynamic loading and thermomechanical aging were applied to the specimens (120,000 cycles, 49 N, 5-55°C). Fracture resistance values were measured in the universal test machine and fracture types were determined. Two-way ANOVA and Tukey test were used for statistical analysis (Jamovi version 2.3.5).
Both the abutment angle and the type of material had a significant effect on fracture resistance (F = 3.295, p < 0.05). The highest fracture resistance was obtained in Group 0˚-Zir, and the lowest fracture resistance was obtained in Group 15˚-VE. Fracture resistance showed significant differences between Group 0˚ and Group 15˚ for the Zir and VE materials, and between Group 0˚ and Group 25˚ for VS (p < 0.05); no statistical significance was determined between the other groups (p>0.05). When failure types were evaluated, they were seen to be full or partial crown fractures, and abutment deformation was found in some samples.
Monolithic crowns may be preferred on angled abutments. The fracture resistance of CAD-CAM materials decreases as the angle of abutments increases. Monolithic zirconia has higher fracture resistance than other materials.
评估经热机械老化后应用于带角度种植体基台的计算机辅助设计和计算机辅助制造（CAD-CAM）单陶瓷冠的耐疲劳性能。
使用不同材料（整体氧化锆[Zir]、氧化锆增强锂硅陶瓷[VS]和混合陶瓷[VE]）对具有三种不同角度（0˚、15˚和 25˚）的钛基台（土耳其 MODE Medical Dental Implant）进行修复。以上颌第一前磨牙形式制作的牙冠用树脂粘接剂（Panavia 2.0 Introkit）粘接到基台上。对试件进行动态加载和热机械老化（120,000 次循环，49N，5-55°C）。在万能试验机上测量断裂阻力值，并确定断裂类型。使用双向方差分析和 Tukey 检验进行统计分析（Jamovi 版本 2.3.5）。
基台角度和材料类型均对断裂阻力有显著影响（F = 3.295，p < 0.05）。0˚-Zir 组的断裂阻力最高，15˚-VE 组的断裂阻力最低。Zir 和 VE 材料中，0˚组和 15˚组之间的断裂阻力差异有统计学意义，VS 材料中，0˚组和 25˚组之间的断裂阻力差异有统计学意义（p < 0.05）；其他组之间无统计学差异（p > 0.05）。当评估失效类型时，发现它们是全冠或部分冠断裂，以及一些样本中的基台变形。
在带角度的基台上可能更倾向于使用整体冠。随着基台角度的增加，CAD-CAM 材料的断裂阻力降低。整体氧化锆的断裂阻力高于其他材料。
