Anastasaki Aikaterini, Bora Pranit, Kourtis Stefanos, Fu Chin Chuan
Department of Prosthodontics, College of Dental Medicine, Columbia University, New York, NY 10032, USA.
Division of Clinic Essentials and Simulation, School of Dentistry, University of Detroit Mercy, Detroit, MI 48221, USA.
Dent J (Basel). 2025 Jun 23;13(7):284. doi: 10.3390/dj13070284.
The existing scientific literature lacks comprehensive information regarding the influence of zirconia crown height on debonding and fracture of the ceramic restorations on titanium base abutments. Additionally, there is a lack of comparative studies evaluating different types of zirconia as restorative options for screw-retained restorations. : The purpose of this study was to assess the fracture strength and the failure modes of the zirconia crown/titanium abutment complex by investigating the impact of increasing the height of zirconia crown and comparing different types of zirconia (3 mol% yttria-stabilized zirconia and translucent 5 mol% yttria-stabilized zirconia). : Six groups of 10 specimens in each group were fabricated. Three groups of specimens (groups # 1, 2, and 3) were fabricated from 3Y zirconia in corresponding heights of 8, 10, and 12 mm. Three more groups (groups # 4, 5, and 6) were fabricated from 5Y zirconia in the same heights (8, 10 and 12 mm). All copings were bonded to 4 mm high titanium base abutments using dual-polymerization resin cement. The specimens underwent load cycling of 100,000 cycles with a force of 100 N. Subsequently, the specimens were loaded to compression until fracture and the failure mode was visually evaluated. : Statistically significant differences in fracture strength were noted among all tested groups. : 3Y zirconia showed increased strength compared to 5Y in all heights. Ceramic copings with lower height showed increased strength compared to higher copings in both tested zirconia materials.
现有科学文献缺乏关于氧化锆冠高度对钛基台陶瓷修复体脱粘和断裂影响的全面信息。此外，缺乏评估不同类型氧化锆作为螺丝固位修复体修复选择的比较研究。本研究的目的是通过研究增加氧化锆冠高度的影响并比较不同类型的氧化锆（3 mol% 氧化钇稳定氧化锆和半透明 5 mol% 氧化钇稳定氧化锆）来评估氧化锆冠/钛基台复合体的断裂强度和失效模式。每组制作 6 组，每组 10 个标本。三组标本（第 1、2 和 3 组）由 3Y 氧化锆制成，相应高度为 8、10 和 12 毫米。另外三组（第 4、5 和 6 组）由相同高度（8、10 和 12 毫米）的 5Y 氧化锆制成。所有基底冠使用双固化树脂水门汀粘结到 4 毫米高的钛基台上。标本承受 100,000 次循环、100 N 力的加载循环。随后，对标本进行压缩加载直至断裂，并对失效模式进行视觉评估。所有测试组之间在断裂强度上均存在统计学上的显著差异。在所有高度下，3Y 氧化锆的强度均高于 5Y 氧化锆。在两种测试的氧化锆材料中，高度较低的陶瓷基底冠比高度较高的基底冠强度更高。
