Federal University of Rio Grande do Norte(UFRN),Department of Dentistry,Natal,Brazil.
Institute of Science and Technology(ICT),Department of Dental Materials and Prosthodontics,São Paulo State University(UNESP/FOSJC).Brasil.
Braz Dent J. 2024 Sep 16;35:e245917. doi: 10.1590/0103-6440202405917. eCollection 2024.
To evaluate the fracture load of bilayer ceramic crowns manufactured by Rapid Layer Technology (RLT) after different cementation protocols of the veneering ceramic to the zirconia infrastructures. Sixty epoxy resin preparations simulating a molar tooth were obtained and 60 zirconia infrastructures and feldspathic crowns were manufactured by RLT and divided into 6 groups according to the cementation protocol at the interface to veneering ceramic (n=10): Ctr- control: conventional resin cement; Al- Al2O3 sandblasting 50µm + conventional resin cement; Al/MDP- Al2O3 sandblasting (50µm) + resin cement with MDP; Sil- silicatization 30µm + conventional resin cement; Gl/HF- glaze + hydrofluoridric acid (5%,60s) + silane + conventional resin cement; Gl- glazing as bonding agent. The feldspathic ceramic internal surface was etched with fluoridric acid (5%) + silane followed by cementation according to respective protocols. All samples were mechanically cycled (200N and 4.5x105 Pa, 37°C, 2x106 cycles, 3.4Hz) and submitted to axial compressing fracture load test (10kN, 0.5mm/min). The results(N) were submitted to descriptive and analytical statistical analysis with 1-way ANOVA, Weibull, and the Tukey test (α=0.05). ANOVA revealed that there was a significant difference among the tested groups (p<0.0001). The group Al/MDP presented the higher resistance to fracture (1972.46A N), followed by the Ctr group (1584.41B N). The characteristic strength(σ0) was significantly different (p=0.000). The crack and chipping were the predominant failures. The air-abrasion at the external surface of zirconia with Al2O3 followed by cementation with MDP resin cement, should be selected to Rapid Layer Technique when felspathic ceramic is used as veneer ceramic.
评估通过快速分层技术（RLT）制造的双层陶瓷冠在不同的饰面陶瓷粘结到氧化锆底层的粘结协议后的断裂负荷。制作了 60 个模拟磨牙的环氧树脂制备体，并通过 RLT 制造了 60 个氧化锆底层和长石冠，并根据与饰面陶瓷界面的粘结协议将其分为 6 组（n=10）：对照组：常规树脂粘结剂；Al-50μm Al2O3喷砂+常规树脂粘结剂；Al/MDP-50μm Al2O3喷砂+含 MDP 的树脂粘结剂；Sil-30μm 硅化+常规树脂粘结剂；Gl/HF-釉质+氢氟酸（5%，60s）+硅烷+常规树脂粘结剂；Gl-釉质作为粘结剂。长石陶瓷的内表面用氟化氢（5%）和硅烷处理，然后根据各自的协议进行粘结。所有样品均进行机械循环（200N 和 4.5x105 Pa，37°C，2x106 循环，3.4Hz），并进行轴向压缩断裂负荷试验（10kN，0.5mm/min）。结果（N）采用单因素方差分析、威布尔和 Tukey 检验（α=0.05）进行描述性和分析性统计分析。方差分析显示，测试组之间存在显著差异（p<0.0001）。Al/MDP 组的断裂阻力最高（1972.46A N），其次是对照组（1584.41B N）。特征强度（σ0）有显著差异（p=0.000）。主要失效模式为裂缝和崩裂。当长石陶瓷用作贴面陶瓷时，应选择在氧化锆外表面进行氧化铝空气喷砂，然后用含 MDP 的树脂粘结剂粘结。
