目的:本研究旨在研究钛基(钛基)基台宏观和微观几何形状对聚合物浸润陶瓷网(PICN)螺钉保留的种植体支撑单冠(iSC)的机械稳定性的影响。
方法:每组12个标本,由PICNiSC修复的六种不同的种植体/基底基牙组合组成:Nb-T(牙龈高度[GH]:1.5mm,假肢高度[PH]:4.3mm),CC(GH:0.8mm,PH:4.3mm),CC-P(GH:0.8mm,PH:7mm),Nb-V(GH:1.5mm,PH:6mm),St(GH:1.5mm,PH:5.5mm),和Th(GH:0.5mm,pH值:9毫米)。样品经过热机械老化,和那些幸存下来的随后受到静态载荷,直到失败。使用单向ANOVA检验和随后的Tukey事后检验(α=.05)分析数据。
结果:所有标本均在热机械老化中幸存,无并发症,即,可见裂缝,脱粘,或拧松螺钉。该组在所有组中表现出最高的强度值,与Nb-T相比有显著差异(p<.05),CC(p<.001),和St(p<.001)。此外,与CC(p<.05)和St(p<.05)相比,CC-P组表现出显著优异的断裂强度结果。
结论:ti-base的选择,特别是假体高度,对PICNiSCs抗骨折能力有显著影响。然而,Ti-base的高度或几何特征在热机械载荷下对iSC/Ti-base组件的机械性能没有显着影响,因为所有标本都经受住了老化,没有并发症或失败。
OBJECTIVE: This study aimed to investigate the influence of titanium base (ti-base) abutment macro- and micro-geometry on the mechanical stability of polymer-infiltrated ceramic network (PICN) screw-retained implant-supported single crowns (iSCs).
METHODS: Twelve specimens per group were used, comprising six different implant/ti-base abutment combinations restored with PICN iSCs: Nb-T (gingival height [GH]: 1.5 mm, prosthetic height [PH]: 4.3 mm), CC (GH: 0.8 mm, PH: 4.3 mm), CC-P (GH: 0.8 mm, PH: 7 mm), Nb-V (GH: 1.5 mm, PH: 6 mm), St (GH: 1.5 mm, PH: 5.5 mm), and Th (GH: 0.5 mm, PH: 9 mm). The specimens underwent thermo-mechanical aging, and those that survived were subsequently subjected to static loading until failure. The data were analyzed using a one-way ANOVA test followed by Tukey post hoc test (α = .05).
RESULTS: All specimens survived thermo-mechanical aging without complications, namely, visible cracks, debonding, or screw loosening. Th group demonstrated the highest strength values among all the groups, with significant differences compared to Nb-T (p < .05), CC (p < .001), and St (p < .001). Additionally, CC-P group exhibited significantly superior fracture strength results compared to CC (p < .05) and St (p < .05).
CONCLUSIONS: The choice of ti-base, particularly prosthetic height, had a significant influence on fracture resistance of PICN iSCs. Nevertheless, the height or geometrical features of the ti-base did not exhibit a significant influence on the mechanical behavior of the iSC/ti-base assembly under thermomechanical loading, as all specimens withstood the aging without complication or failure.