Rosa Lucas Saldanha da, Souza Luiza Freitas Brum, Chiapinotto Gratcheva Falcão, Pires Telma de Souza, Piva Amanda Maria de Oliveira Dal, Kleverlaan Cornelis Johannes, Pereira Gabriel Kalil Rocha
Post-Graduate Program in Oral Sciences (Prosthodontics Unit), Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil.
Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, North Holland, the Netherlands.
Braz Dent J. 2024 Dec 16;35:e246091. doi: 10.1590/0103-644020246091. eCollection 2024.
The aim of this study is to assess the presence of MDP at various stages of the bonding procedure, enhance the adhesive and mechanical behavior of cemented zirconia ceramics. Fifty ceramic slices (15 × 15 × 2 mm) and 48 discs (Ø= 10 mm, 1 mm thickness) were prepared, sintered, air-abraded with aluminum oxide, and allocated considering: 1) microshear bond strength (µSBS) between ceramic slices and luting agent cylinders (height= 1 mm, Ø= 1.2 mm); 2) fatigue behavior, ceramic discs paired and bonded onto fiber-epoxy resin discs (Ø= 10 mm, 2.5 mm thickness), and then mechanically tested (cyclic loading, starting at 400N, with increments of 100N, until failure). Four experimental groups were defined: Universal Primer (MDP primer+non-MDP resin cement - RC), Universal Adhesive (MDP adhesive+non-MDP RC), Cement (no primer+MDP RC), and Primer+Cement (MDP primer + MDP RC). For both outcomes, half of the specimens were tested after 24 hours, and half after aging. Bond strength data was analyzed via two-way ANOVA and Tukey post-hoc tests, while fatigue data went through Kaplan-Meier and Mantel-Cox post hoc tests. Regarding µSBS, aging impaired adhesion only for the Primer+Cement group (p<0.001). Universal Primer and Universal Adhesive showed the highest bond strength (p<0.05). Despite that, fatigue data indicates no significant differences (p>0.05). In conclusion, systems with MDP-containing components associated with non-MDP resin cement demonstrated enhanced adhesive capability for zirconia restorations. Nevertheless, no differences in terms of mechanical reinforcement were observed.
本研究的目的是评估在粘结过程的各个阶段中MDP的存在情况，增强粘结氧化锆陶瓷的粘结和机械性能。制备了50个陶瓷片（15×15×2mm）和48个圆盘（直径=10mm，厚度=1mm），进行烧结、用氧化铝空气研磨，并根据以下因素进行分组：1）陶瓷片与粘结剂圆柱体（高度=1mm，直径=1.2mm）之间的微剪切粘结强度（µSBS）；2）疲劳行为，将陶瓷圆盘配对并粘结到纤维环氧树脂圆盘（直径=10mm，厚度=2.5mm）上，然后进行机械测试（循环加载，从400N开始，每次增加100N，直至破坏）。定义了四个实验组：通用底漆（MDP底漆+非MDP树脂粘结剂-RC）、通用粘结剂（MDP粘结剂+非MDP RC）、粘结剂（无底漆+MDP RC）和底漆+粘结剂（MDP底漆+MDP RC）。对于这两个结果，一半的试样在24小时后进行测试，另一半在老化后进行测试。粘结强度数据通过双向方差分析和Tukey事后检验进行分析，而疲劳数据则通过Kaplan-Meier和Mantel-Cox事后检验进行分析。关于µSBS，老化仅对底漆+粘结剂组的粘结产生了损害（p<0.001）。通用底漆和通用粘结剂显示出最高的粘结强度（p<0.05）。尽管如此，疲劳数据表明没有显著差异（p>0.05）。总之，含有MDP成分与非MDP树脂粘结剂结合的系统对氧化锆修复体显示出增强的粘结能力。然而，在机械增强方面未观察到差异。
