Associate Professor, Department of Prosthodontics, Showa University School of Dentistry, Tokyo, Japan.
Lecturer, Department of Prosthodontics, Showa University School of Dentistry, Tokyo, Japan.
J Prosthet Dent. 2022 Oct;128(4):815-821. doi: 10.1016/j.prosdent.2021.01.019. Epub 2021 Mar 14.
Ceria-stabilized zirconia-alumina nanocomposite (Ce-TZP-AlO) has properties that may be suitable for partial denture frameworks. However, studies on its adhesion strength and durability with denture base resin are lacking.
The purpose of this in vitro study was to determine the optimal surface treatment for Ce-TZP-AlO to secure a durable bond with an acrylic resin.
The surface of Ce-TZP-AlO test specimens was alumina airborne-particle abraded (Group APA) and then treated with 10-methacryloyloxydecyl dihydrogen phosphate (MDP) (Group MDP) and 2 silica coating methods: the flame spraying method (Group SLP) and the tribochemical treatment (110 μm: Group TRB-P, 30 μm: Group TRB-S). TRB-P and TBR-S were further treated by MDP (Group CBT-P and CBT-S). Autopolymerizing acrylic resin was bonded to the specimens, and the shear bond strength was tested after thermocycling (5 °C and 60 °C, 10 000 cycles). The area of the resin remaining on the fractured surfaces was also measured. To evaluate the effect of the surface treatment condition on shear bond strength and the resin remaining, 1-way analysis of variance (ANOVA) was conducted, followed by the Tukey multiple comparison post hoc test. Additionally, the effect of thermocycling on the specimens was evaluated by the Student t test.
After placement in deionized water for 24 hours, the shear bond strengths of Group MDP and 2 types of combination treatment (Groups CBT-P and CBT-S) were significantly higher than those of Groups SLP, TRB-P, and TRB-S (P<.05). Moreover, the fractured surface of all the treatment conditions except Group APA showed cohesive failure. The shear bond strength as a result of all treatment conditions decreased significantly after thermocycling (P<.05). Group CBT-S showed the highest shear bond strength; however, no significant differences were found between Groups CBT-S and MDP (P=.908). In particular, the area of resin remaining on the fractured surfaces of Group CBT-S was 100% (cohesive failure).
The combined surface treatment of alumina airborne-particle abrasion and tribochemical treatment, along with primer treatment using silane coupling and an MDP monomer, improved the adhesion strength and adhesion durability between base resins and Ce-TZP-AlO.
氧化铈稳定氧化锆-氧化铝纳米复合材料（Ce-TZP-AlO）具有可能适用于局部义齿支架的特性。然而，关于其与义齿基托树脂的黏附强度和耐久性的研究尚少。
本体外研究的目的是确定 Ce-TZP-AlO 的最佳表面处理方法，以确保其与丙烯酸树脂具有持久的黏附力。
Ce-TZP-AlO 试件的表面经氧化铝喷砂（Group APA）处理，然后分别用 10-甲氧基癸基二氢磷酸酯（MDP）（Group MDP）和 2 种硅烷涂层方法处理：火焰喷涂法（Group SLP）和摩擦化学处理（110 μm：Group TRB-P，30 μm：Group TRB-S）。TRB-P 和 TRB-S 进一步用 MDP 处理（Group CBT-P 和 CBT-S）。自聚合丙烯酸树脂黏附于试件上，经热循环（5°C 和 60°C，10000 次循环）后测试剪切黏附强度。还测量了断裂表面上残留树脂的面积。为了评估表面处理条件对剪切黏附强度和残留树脂的影响，进行了单因素方差分析（ANOVA），然后进行了 Tukey 多重比较后验检验。此外，通过学生 t 检验评估热循环对试件的影响。
在去离子水中放置 24 小时后，Group MDP 和 2 种组合处理（Group CBT-P 和 CBT-S）的剪切黏附强度显著高于 Group SLP、TRB-P 和 TRB-S（P<.05）。此外，除 Group APA 之外，所有处理条件的断裂面均显示出内聚性破坏。经热循环后，所有处理条件的剪切黏附强度均显著降低（P<.05）。Group CBT-S 显示出最高的剪切黏附强度；然而，Group CBT-S 和 MDP 之间无显著差异（P=.908）。特别是，Group CBT-S 断裂表面上的残留树脂面积为 100%（内聚性破坏）。
氧化铝喷砂和摩擦化学处理联合硅烷偶联和 MDP 单体预处理，改善了基托树脂与 Ce-TZP-AlO 之间的黏附强度和黏附耐久性。
