153 - Glass ceramics behavior like etched enamel on self-etching/curing resin cement interface

• Published in: Dental materials Vol. 39; pp. e82 - e83
• Main Authors: Borges, AFS, Monteiro, RS, Ferrairo, BM, Silva, LJA, Rubo, JH, Furuse, AY, Cesar, PF, Silikas, N
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 2023
• ISSN: 0109-5641; 1879-0097
• DOI: 10.1016/j.dental.2023.08.168

This work aimed to analyze the micro shear bond strength of ceramic and dental substrates to Multilink® Speed self-adhesive/curing resin cement (Ivoclar Vivadent, Schaan, Liechtenstein). The groups were composed of (1) ceramic/cement interfaces: LD - Lithium Disilicate (IPS e.max CAD®); ZLS - Zirconia-reinforced lithium silicate (Celtra Duo®); Y-TZP MO – Medium Opacity Yttria-stabilized tetragonal zirconia polycrystal (IPS ZirCAD MO®); Y-TZP T - Translucency yttria-stabilized tetragonal polycrystal (IPS ZirCAD MT®), and by (2) cement/dental interfaces (enamel or dentin): E + E – selective phosphoric acid etching enamel; E - unetched enamel; Dentin - middle dentin. Ceramic blocks were sectioned into 2mm thick slices in a cutting machine with a diamond disc under cooling, followed by standardized polishing, crystallization or sintering, PVC inclusion, final polishing, and surface treatments according to each ceramic composition (n=20). Teeth slices (2mm thick) were obtained from human third molars, PVC included, followed by polishing. The cement cylinders (Ø = 1.4; height = 1.0) were bonded to substrates, following the manufacturer's instructions. The specimens were stored in deionized water at 37°C for 24h and subjected to the micro shear bond strength test. Data were submitted to statistical analysis using the Kruskal-Wallis and Dunn tests. Failure types were classified as adhesive, cohesive, and mixed, with a representative specimen of each failure submitted to a scanning electron microscope (SEM). Weibull statistical analysis was performed to obtain the following metrics: the probability of failure, Weibull modulus (m) (reliability), and characteristic strength (σ0). The E + E group showed the highest median value, lower probability of failure, higher reliability, and higher characteristic strength among all the evaluated groups, with significant similarity to the ZLS and LD groups and a statistically significant difference to the other dental substrates. E and Dentin showed the lowest medians among all substrate types. The Glass-ceramics the ZLS showed high characteristic strength and the LD showed greater reliability. The adhesive failure mode was predominant among the failure types. Glass-ceramics showed higher characteristic strength, lower probability of failure, and greater reliability, being similar to selectively etched enamel.