Dapieve Kiara Serafini, Machry Renan Vaz, Pilecco Rafaela Oliveira, Kleverlaan Cornelis Johannes, Rocha Pereira Gabriel Kalil, Venturini Andressa Borin, Valandro Luiz Felipe
DDS, MSciD and PhD Post-Graduate Program in Oral Science, Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, Noord-Holland, the Netherlands.
J Mech Behav Biomed Mater. 2020 Apr;104:103686. doi: 10.1016/j.jmbbm.2020.103686. Epub 2020 Feb 9.
The aim of the study was to evaluate the effect of a ceramic primer and its increased passive application on the fatigue performance of adhesively cemented lithium disilicate simplified restorations. Ceramic discs (Ø = 10 mm; thickness = 1.0 mm) were submitted to an in-lab simulation of CAD/CAM milling and allocated into 8 groups (n = 15), considering 2 factors: "surface treatment"- PRIMER, only coupling agent application (Monobond N); HF5+PRIMER, 5% hydrofluoric acid and coupling agent; E&P 20s + 40s and E&P 20s+5min, ceramic etching/priming (Monobond Etch & Prime, E&P) for 20 s of active application followed by 40 s or 5 min of passive application, respectively; and "aging condition"- baseline, storage for 24 h to 5 days; aged, storage for 90 days +12,000 thermal cycles. Adhesive cementation (Multilink N) was performed onto epoxy discs (Ø = 10 mm; thickness = 2 mm) and the cemented assemblies were subjected to step-stress fatigue tests (initial load of 200 N; step-size of 50 N; 10,000 cycles per step; 20 Hz). The results showed that the groups had similar fatigue performance in the baseline condition (except for E&P 20s+5min: 940.0 N; 123,000 cycles > PRIMER: 786.7 N; 92,333 cycles). When aged, the PRIMER group presented the worst fatigue performance (480.8 N; 31,154 cycles) compared to the other groups (810.0-840.0 N; 97,000-103,000 cycles). In addition, only the PRIMER treatment showed unstable fatigue performance (baseline > aged). Therefore, ceramic surface treatment promoting micromechanical interlocking and chemical bonds is mandatory for stable fatigue performance of adhesively cemented lithium disilicate restorations. The one-step ceramic primer/conditioner promoted similar fatigue performance to the 5% hydrofluoric acid + coupling agent, but increased E&P etching time did not improve the fatigue behavior.
本研究的目的是评估一种陶瓷底漆及其增加的被动作用对粘结式二硅酸锂简化修复体疲劳性能的影响。将陶瓷圆盘（直径 = 10 mm；厚度 = 1.0 mm）进行实验室模拟CAD/CAM铣削，并分为8组（每组n = 15），考虑两个因素：“表面处理”——仅应用偶联剂的底漆（Monobond N）；氢氟酸5% + 底漆，5%氢氟酸和偶联剂；蚀刻/底漆处理20秒 + 40秒和蚀刻/底漆处理20秒 + 5分钟，分别对陶瓷进行20秒的主动蚀刻/底漆处理（Monobond Etch & Prime，E&P），随后进行40秒或5分钟的被动处理；以及“老化条件”——基线，储存24小时至5天；老化，储存90天 + 12,000次热循环。将粘结剂（Multilink N）粘结到环氧圆盘（直径 = 10 mm；厚度 = 2 mm）上，对粘结组件进行阶梯应力疲劳试验（初始载荷200 N；步长50 N；每步10,000次循环；20 Hz）。结果表明，在基线条件下，各组的疲劳性能相似（蚀刻/底漆处理20秒 + 5分钟组除外：940.0 N；123,000次循环 > 底漆组：786.7 N；92,333次循环）。老化后，与其他组（810.0 - 840.0 N；97,000 - 103,000次循环）相比，底漆组的疲劳性能最差（480.8 N；31,154次循环）。此外，只有底漆处理显示出不稳定的疲劳性能（基线 > 老化）。因此，对于粘结式二硅酸锂修复体的稳定疲劳性能而言，促进微机械互锁和化学键合的陶瓷表面处理是必不可少的。一步法陶瓷底漆/调节剂的疲劳性能与5%氢氟酸 + 偶联剂相似，但增加蚀刻/底漆处理时间并不能改善疲劳行为。
