Att Wael, Kurun Sirin, Gerds Thomas, Strub Joerg R
Department of Prosthodontics, University of Freiburg, Germany.
J Prosthet Dent. 2006 Feb;95(2):111-6. doi: 10.1016/j.prosdent.2005.12.003.
High-strength ceramic materials can be used to fabricate esthetic and stable implant-supported single-tooth restorations. No study was identified that compared the fracture resistance of individual components of single-tooth implant-supported all-ceramic restorative systems after artificial aging.
The purpose of this in vitro study was to evaluate the fracture resistance of single-tooth implant-supported all-ceramic restorations consisting of alumina all-ceramic restorations on different implant abutments and to identify the weakest component of the restorative system.
Forty-eight standardized maxillary central incisor alumina crowns (Procera) were fabricated for each of the 3 test groups (n = 16) (Control group Ti, titanium abutments; Group Al, alumina abutments; Group Zr, zirconia abutments) for the Replace implant system. The crowns were adhesively luted using a resin luting agent (Panavia 21) and artificially aged through dynamic loading and thermal cycling. Afterwards, all specimens were tested for fracture resistance using compressive load on the palatal surfaces of the crowns. Kruskal-Wallis analysis of variance and post hoc Wilcoxon rank sum tests were performed to test for differences in fracture resistance values (alpha = .05).
All test specimens survived the artificial aging process using simulated oral conditions. No screw loosening was recorded. The median fracture resistance was 1454 N, 422.5 N, and 443.6 N for groups Ti, Al, and Zr, respectively. Significant differences were found for the fracture resistance comparisons of group Ti with groups Al and Zr (Kruskal-Wallis test, P < .001). The test results for the comparison of groups Al and Zr were not significant.
All 3 implant-supported restorations have the potential to withstand physiologic occlusal forces applied in the anterior region.
高强度陶瓷材料可用于制作美观且稳定的种植体支持的单颗牙修复体。未发现有研究比较单颗牙种植体支持的全瓷修复系统各组件在人工老化后的抗折强度。
本体外研究的目的是评估由不同种植体基台上的氧化铝全瓷修复体组成的单颗牙种植体支持的全瓷修复体的抗折强度，并确定修复系统中最薄弱的组件。
为Replace种植系统的3个试验组（n = 16）（对照组Ti，钛基台；Al组，氧化铝基台；Zr组，氧化锆基台）各制作48个标准化的上颌中切牙氧化铝全瓷冠（Procera）。使用树脂粘结剂（Panavia 21）将全瓷冠粘结就位，并通过动态加载和热循环进行人工老化。之后，对所有标本在全瓷冠腭面施加压缩载荷以测试抗折强度。进行Kruskal-Wallis方差分析和事后Wilcoxon秩和检验以测试抗折强度值的差异（α = .05）。
所有测试标本在模拟口腔条件下的人工老化过程中均存活。未记录到螺钉松动。Ti组、Al组和Zr组的抗折强度中位数分别为1454 N、422.5 N和443.6 N。Ti组与Al组和Zr组的抗折强度比较存在显著差异（Kruskal-Wallis检验，P < .001）。Al组和Zr组的比较测试结果不显著。
所有3种种植体支持的修复体都有可能承受前牙区施加的生理咬合力。
