Int J Oral Maxillofac Implants. 2022 Jan-Feb;37(1):19-29. doi: 10.11607/jomi.8923.
This in vitro study evaluated technical outcomes of monolithic zirconia implant-supported fixed dental prostheses (iFDPs) supported by different designs of titanium base abutments after aging and static load testing.
Sixty three-unit monolithic zirconia (yttrium oxide partially stabilized tetragonal zirconia polycrystals; Y-TZP)iFDPs were produced and divided into four groups: group A-conical titanium base abutments for the prosthesis; group B-cylindrical titanium base abutments for the crown; group C-conical titanium base abutment for the prosthesis and cylindrical titanium base abutment for the crown; group D-cylindrical titanium base abutments for the prosthesis. The samples were subjected to an aging protocol and to continuous static loading until failure and analyzed visually and with specific software. The technical outcomes comprised the occurrence of debonding, screw loosening, deformation and fracture, abutment deformation and fracture, implant deformation and fracture, zirconia chipping and fracture, and bending moments. The Pearson chi-squared test (χ) and Fischer exact test were used to compare the outcomes. The Kolmogorov-Smirnov test was used to evaluate data distribution of the bending moments. Analysis of variance (ANOVA) was used for the analysis of parametric data distribution, and the Kruskal-Wallis test was used for nonparametric data distribution.
After aging, a higher percentage of debonding (P = .042) and micromovement (P = .034) was recorded in group C (P = .042). The conical titanium base abutments had a higher debonding (P = .049) and a higher macromovement rate (P = .05). The static load test showed higher bending moments in group D (P = .001) and lower bending moments in group A (P = .001). Debonding was highest in group C (P = .001) and lowest in group A (P = .002). Complete loss of retention rate was highest in group C (P = .001). The conical titanium base abutment had the highest debonding rate (P = .001) and complete loss of retention (P = .001). The micromovement rate was the highest for cylindrical titanium base abutments for the crown (P = .001). The lowest screw loosening, zirconia chipping, and fracture rate (P = .001) and the highest screw deformation (P = .004) were recorded in group A. The screw deformation rate was lowest in the cylindrical titanium base abutments for the crown (P = .008).
The mixed titanium base abutment design comprising one conical and one cylindrical abutment in Y-TZP iFDPs led to the highest debonding rate. The cylindrical titanium base abutment for the prosthesis provided a lower percentage of debonding and the highest load resistance.
本体外研究评估了不同设计的钛基基台对单块氧化锆种植体支持的固定义齿（iFDP）在老化和静态负载测试后的技术效果。
制作了 63 单位的整体氧化锆（部分稳定氧化钇四方氧化锆多晶；Y-TZP）iFDP，并将其分为四组：A 组-用于修复体的锥形钛基基台；B 组-用于牙冠的圆柱形钛基基台；C 组-用于修复体的锥形钛基基台和用于牙冠的圆柱形钛基基台；D 组-用于修复体的圆柱形钛基基台。样本经过老化方案和连续静态负载测试，直至失效，并通过视觉和特定软件进行分析。技术结果包括脱粘、螺丝松动、变形和断裂、基台变形和断裂、种植体变形和断裂、氧化锆崩裂和断裂以及弯曲力矩。使用 Pearson 卡方检验（χ）和 Fischer 确切检验比较结果。使用 Kolmogorov-Smirnov 检验评估弯曲力矩的数据分布。分析方差（ANOVA）用于分析参数数据分布，克鲁斯卡尔-沃利斯检验用于非参数数据分布。
老化后，C 组的脱粘率（P =.042）和微移动率（P =.034）更高（P =.042）。锥形钛基基台的脱粘率（P =.049）和较大的移动率更高（P =.05）。静态负载测试显示 D 组的弯曲力矩更高（P =.001），A 组的弯曲力矩更低（P =.001）。C 组的脱粘率最高（P =.001），A 组的脱粘率最低（P =.002）。C 组的完全丧失保留率最高（P =.001）。锥形钛基基台的脱粘率最高（P =.001），完全丧失保留率最高（P =.001）。对于牙冠的圆柱形钛基基台，微移动率最高（P =.001）。A 组的螺丝松动、氧化锆崩裂和断裂率最低（P =.001），螺丝变形率最高（P =.004）。对于牙冠的圆柱形钛基基台，螺丝变形率最低（P =.008）。
在 Y-TZP iFDP 中使用混合钛基基台设计，包括一个锥形和一个圆柱形基台，导致脱粘率最高。用于修复体的圆柱形钛基基台的脱粘率较低，负载阻力较高。
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