Professor, School of Dentistry, Meridional Faculty, ATITUS, Passo Fundo, Rio Grande do Sul, Brazil; Post-Graduate student Program in Dentistry, School of Dentistry, University of Ribeirão Preto, UNAERP, Ribeirão Preto, São Paulo, Brazil.
Professor, MSciD Post-Graduate Program in Dentistry, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul, Brazil.
J Prosthet Dent. 2024 Sep;132(3):627-635. doi: 10.1016/j.prosdent.2022.08.014. Epub 2022 Oct 4.
Preheated composite resin and adhesive coating have been recommended as luting agents for ceramic veneers; however, information about the mechanical behavior of feldspathic porcelain veneers after using these methods is still limited.
The purpose of this in vitro study was to evaluate the influence of the use of preheated composite resin or an adhesive resin layer on the strengthening of a feldspathic porcelain.
Feldspathic porcelain disks were fabricated (N=210), etched (10% hydrofluoric acid for 90 seconds), and bonded according to resin-based luting agents (30 per group) for the biaxial flexural strength tests: photopolymerized resin cement, flowable composite resin, preheated composite resin, with or without previous adhesive coating. Characteristic strength and Weibull modulus were calculated. The viscosity of the luting agents was measured by using isothermal analyses. Finite element analysis simulated the flexural test. Fractographic and bonded interfaces were observed.
The use of preheated composite resin led to the lowest stress levels in the feldspathic porcelain veneers. However, it did not increase the ceramic strengthening compared with other luting agents, as higher values were observed with flowable composite resin (P<.05). The use of an adhesive resin layer had no significant effect on ceramic strengthening when associated with preheated composite resin or resin cement (P>.05). Preheated composite resin presented the highest viscosity and led to incomplete filling of the porcelain surface irregularities. Failures originated on the ceramic surface subjected to tensile stress and were typically associated with pores at the ceramic-luting agent interface.
The use of preheated composite resin or an adhesive resin layer did not have a positive effect on strengthening feldspathic porcelain.
预热复合树脂和粘接剂涂层已被推荐作为陶瓷贴面的粘固剂；然而，关于使用这些方法后长石质瓷贴面的机械性能的信息仍然有限。
本体外研究的目的是评估使用预热复合树脂或粘接树脂层对长石质瓷增强的影响。
制作长石质瓷圆盘（N=210），蚀刻（10%氢氟酸 90 秒），并根据树脂基粘固剂（每组 30 个）进行双轴弯曲强度测试进行粘接：光固化树脂水泥、流动复合树脂、预热复合树脂，有无先前的粘接涂层。计算特征强度和威布尔模数。通过等温分析测量粘固剂的粘度。有限元分析模拟弯曲试验。观察断裂形貌和粘结界面。
使用预热复合树脂导致长石质瓷贴面的最低应力水平。然而，与其他粘固剂相比，它并没有增加陶瓷的增强效果，因为流动复合树脂的强度更高（P<.05）。当与预热复合树脂或树脂水泥联合使用时，使用粘接树脂层对陶瓷增强没有显著影响（P>.05）。预热复合树脂表现出最高的粘度，并导致瓷表面不规则处不完全填充。失效起源于受拉伸应力的陶瓷表面，通常与陶瓷-粘固剂界面处的孔隙有关。
使用预热复合树脂或粘接树脂层对增强长石质瓷没有积极作用。
