Strengthening ceramic surfaces with the use of resin cements based on thiourethane oligomers

Author(s)

Correr-Sobrinho, Lourenco ^[1] ; Costa, Ana R. ^[1] ; Fugolin, Ana P. ^[2] ; Borges, Lincoln P. S. ^[1] ; Ferracane, Jack L. ^[2] ; Pfeifer, Carmem S. ^{[2, 1]}

Affiliation

^[1] Univ Estadual Campinas, Piracicaba Sch Dent, Dept Dent Mat, Piracicaba, SP - Brazil

^[2] Oregon Hlth & Sci Univ, Sch Dent Biomat & Biomech, Portland, OR 97201 - USA

• Document type: Journal article
• Source: Journal of Applied Polymer Science; v. 137, n. 35 JAN 2020.
• Web of Science Citations: 0

Abstract

This study evaluated the effects of thiourethane (TU) additives on the flexural strength (sigma(f)) and elastic modulus (E-f) of a resin cement, and on a possible strengthening of ceramic restorations. Methods Two TUs (ARomatic and ALiphatic) were added at 0 (control-EC) or 20 wt% to photopolymerizable resin cements. RelyX Ultimate (RU) was the commercial control. Flexural strength (sigma(f)) and elastic modulus (E-f) of the cements were measured in three-point bending (n = 8). Biaxial flexural strength (sigma(bf)) of ceramic discs with and without cement layering were determined using a ball-on-ring setup. The sigma(bf) of cement-coated specimens was calculated at positions z = 0 (ceramic surface, bonded interface) and z = -t(2) (cement surface above ring). Data were analyzed with one-way ANOVA/Tukey test (alpha = .05). Results sigma f of AR was significantly higher than for AL and RU, and E-f was lower. The E-f of RU was significantly higher than all other groups. At z = 0, all resin-coated groups had higher sigma(bf). The sigma(bf) of RU, AR, and AL were significantly higher than EC and unfilled resin group. At z = -t(2), RU had significantly higher sigma(bf). Significance All resin cements were able to strengthen the ceramic, with the TU-modified material presenting similar results to the commercial material. (AU)

• FAPESP's process: 16/03576-9 - EFFECT OF EXPERIMENTAL RESIN CEMENTS FROM THIO-URETHANE OLIGOMERS ON THE FLEXURAL STRENGTH, THERMAL CYCLING AND FATIGUE OF DENTAL CERAMIC SUBMITTED TO ETCHING
• Grantee: Lourenço Correr Sobrinho
• Support Opportunities: Scholarships abroad - Research