Park Chan-Ho, Ko Kyung-Ho, Huh Yoon-Hyuk, Park Chan-Jin, Cho Lee-Ra
Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University, Gangneung, Republic of Korea.
J Prosthodont. 2025 Mar;34(3):308-315. doi: 10.1111/jopr.13820. Epub 2024 Jan 16.
The purpose of this in vitro study was to compare the tensile bond strength (TBS) of resin nanoceramics (RNC), zirconia, and lithium disilicate (LS2) restorations cemented to titanium abutments before and after thermomechanical aging.
Twelve specimens per group were fabricated to determine the TBS between a titanium abutment and four types of crown materials (2 RNCs, LS2, and translucent zirconia crowns for the maxillary molar). After milling, the abutments and crowns were cemented with resin cement after air-particle abrasion. In addition, thermomechanical aging (200,000 cycles, 50 N, 2 Hz) was applied to half of the specimens by using a mastication simulator. TBS was measured by using a universal testing machine. The interface between the crown and the cement was observed by using scanning electron microscopy (SEM). Two-way ANOVA was performed to analyze the effects of crown materials and thermomechanical aging. Failure-mode and interface analyses were also conducted.
After thermomechanical aging, the TBS decreased in the LS2 specimens and increased in RNCs (p < 0.001). The ratio of mixed failure and debonding with the hole-sealing resin increased in the RNC group. SEM images showed the reduced gap between the crown and the resin cement after thermomechanical aging in the RNC group.
Differences in TBS were affected by the crown materials after thermomechanical aging. After thermomechanical aging, the RNC crowns showed increased TBS, whereas LS2 and zirconia crowns exhibited decreased or similar TBS.
本体外研究的目的是比较热机械老化前后，树脂纳米陶瓷（RNC）、氧化锆和二硅酸锂（LS2）修复体与钛基台粘结的拉伸粘结强度（TBS）。
每组制作12个试件，以确定钛基台与四种类型冠材料（两种RNC、LS2以及上颌磨牙的半透明氧化锆冠）之间的TBS。铣削后，经空气颗粒研磨处理，基台和冠用树脂水门汀粘结。此外，使用咀嚼模拟器对一半试件施加热机械老化（200,000次循环，50 N，2 Hz）。使用万能试验机测量TBS。通过扫描电子显微镜（SEM）观察冠与水门汀之间的界面。进行双向方差分析以分析冠材料和热机械老化的影响。还进行了失效模式和界面分析。
热机械老化后，LS2试件的TBS降低，RNC的TBS升高（p < 0.001）。RNC组中与封孔树脂混合失效和脱粘的比例增加。SEM图像显示，热机械老化后RNC组中冠与树脂水门汀之间的间隙减小。
热机械老化后，TBS的差异受冠材料影响。热机械老化后，RNC冠的TBS升高，而LS2和氧化锆冠的TBS降低或相似。
