Silica-Based Infiltrations for Enhanced Zirconia-Resin Interface Toughness

Author(s)

Ramos, N. C. ^{[1, 2]} ; Kaizer, M. R. ^[1] ; Campos, T. M. B. ^[3] ; Kim, J. ^[4] ; Zhang, Y. ^[1] ; Melo, R. M. ^[2]

Affiliation

^[1] NYU, Coll Dent, Dept Biomat & Biomimet, 433 First Ave, Room 810, New York, NY 10010 - USA

^[2] Sao Paulo State Univ UNESP, Dept Dent Mat & Prosthodont, Inst Sci & Technol Sao Jose dos Campos, 777 Eng Francisco Jose Longo Ave, BR-12245000 Sao Jose Dos Campos, SP - Brazil

^[3] Aeronaut Technol Inst ITA, Dept Phys, Sao Jose Dos Campos, SP - Brazil

^[4] Univ Connecticut, Dept Civil & Environm Engn, Storrs, CT - USA

• Document type: Journal article
• Source: JOURNAL OF DENTAL RESEARCH; v. 98, n. 4, p. 423-429, APR 2019.
• Web of Science Citations: 2

Abstract

Novel silica-based infiltrations on the surface of zirconia have the potential to improve their bondability, allowing for the etching/silane adhesive bonding technique. Nonetheless, adhesively bonded joints are subject to mixed tensile and shear stresses when the restoration is in occlusal service. Thus, we aimed to investigate the effect of 2 novel silica-based infiltrations on the interfacial toughness of adhesively bonded zirconia using the Brazil nut method, which allows for controlled types of stresses to be applied at the interfaces. In total, 150 3Y-TZP (In-Ceram YZ; Vita) Brazil nuts were machined and randomly assigned to 3 groups: C, control (air abraded); SG, sol-gel silica infiltration; and GI, glass infiltration. SG specimens were immersed twice in silicic acid for 20 min and dried (100 degrees C, 1 h). GI specimens were presintered (1,400 degrees C, 1 h) before a glass powder slurry was applied to the intaglio surface. All specimens were then sintered (1,530 degrees C, 2 h). Following adhesive bonding (Panavia F 2.0, Kuraray) and water storage (37 degrees C) for 10 d, the Brazil nuts were subdivided into groups baseline and aged (40,000 thermal cycles between 5 degrees C and 55 degrees C, with a dwell time of 30 s). The Brazil nuts were subjected to axial-loading tests using various inclinations (precrack angle with load direction): Theta = 0 degrees, 5 degrees, 10 degrees, 15 degrees, or 25 degrees, which define the stress type at the interface, from pure tension (0 degrees) to increasing levels of shear. Under pure tension (0 degrees), GI yielded superior interfacial fracture energy, SG and C were similar, and aging had no effect. Under predominantly shear stresses (25 degrees), aging significantly decreased interfacial fracture energy of C and SG, while GI remained stable and was superior. The glass infiltration of the zirconia intaglio surface increases its adhesive bonding interfacial toughness. The sol-gel silica infiltration method requires improvement to obtain a homogeneous surface infiltration and an enhanced bond strength. (AU)

• FAPESP's process: 16/07920-6 - Silica infiltrated zirconia obtained through the sol-gel method for dental applications
• Grantee: Renata Marques de Melo Marinho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/20001-0 - Effect of Silica Infiltrations of Dental Zirconia in Interfacial Energy to Fracture
• Grantee: Nathália de Carvalho Ramos Ribeiro
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 15/16387-7 - Effect of silica infiltrations by the sol-gel method on a dental zirconia: microstructure, mechanical properties and interfacial fracture energy
• Grantee: Nathália de Carvalho Ramos Ribeiro
• Support Opportunities: Scholarships in Brazil - Doctorate