Malgaj Tine, Papšík Roman, Abram Anže, Kocjan Andraž, Jevnikar Peter
Department of Prosthodontics, Faculty of Medicine, University of Ljubljana, Hrvatski trg 6, 1000 Ljubljana, Slovenia.
Department of Material Science, Montanuniversität Leoben, A-8700 Leoben, Austria.
Materials (Basel). 2023 Mar 27;16(7):2646. doi: 10.3390/ma16072646.
Debonding of zirconia cantilevered resin-bonded fixed dental prostheses (RBFDPs) remains the main treatment complication, therefore, the present in vitro study aimed to evaluate the effect of different surface pretreatments on the bonding of zirconia RBFDPs. Eighty milled zirconia maxillary central incisors, with complementary zirconia cantilevered RBFDPs, were randomly subjected to four different surface pretreatments ( = 20): as-machined (AM); airborne-particle abraded (APA); coated with nanostructured alumina coating (NAC); incisor air-abraded and RBFDP coated (NAC_APA). After bonding, half of each group ( = 10) was stored in deionized water (150 days/37 °C), thermocycled (37,500 cycles, 5-55 °C), and cyclically loaded (50 N/1.2 × 10). Load-bearing capacity (LBC) was determined using a quasi-static test. Additionally, finite element analysis (FEA) and fractography were performed. -test and one-way ANOVA were used for statistical-analysis. Before aging, the NAC group provided superior LBC to other groups ( < 0.05). After aging, the AM specimens debonded spontaneously, while other groups exhibited comparable LBC ( ˃ 0.05). The FEA results correlated with the in vitro experiment and fractography, showing highly stressed areas in the bonding interface, cement layer, and in RBFDP's retainer wing and connector. The NAC RBFDPs exhibited comparable long-term bonding performance to APA and should be regarded as a zirconia pretreatment alternative to APA.
氧化锆悬臂式树脂粘结固定义齿（RBFDPs）的脱粘仍然是主要的治疗并发症，因此，本体外研究旨在评估不同表面预处理对氧化锆RBFDPs粘结的影响。八十颗经铣削的氧化锆上颌中切牙及配套的氧化锆悬臂式RBFDPs被随机分为四种不同的表面预处理组（每组 = 20）：机械加工后（AM）；空气颗粒研磨（APA）；涂覆纳米结构氧化铝涂层（NAC）；切牙空气研磨并对RBFDPs涂覆（NAC_APA）。粘结后，每组的一半（ = 10）储存在去离子水中（150天/37°C），进行热循环（37,500次循环，5 - 55°C），并进行循环加载（50 N/1.2×10）。使用准静态试验测定承载能力（LBC）。此外，还进行了有限元分析（FEA）和断口分析。采用t检验和单因素方差分析进行统计分析。老化前，NAC组的LBC优于其他组（ < 0.05）。老化后，AM试件自发脱粘，而其他组的LBC相当（ ˃ 0.05）。FEA结果与体外实验和断口分析相关，显示粘结界面、粘结剂层以及RBFDPs的固位翼和连接体中有高应力区域。NAC RBFDPs表现出与APA相当的长期粘结性能，应被视为APA的一种氧化锆预处理替代方法。
