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Strengthening ceramic surfaces with the use of resin cements based on thiourethane oligomers
Author(s) -
CorrerSobrinho Lourenco,
Costa Ana R.,
Fugolin Ana P.,
Borges Lincoln P. S.,
Ferracane Jack L.,
Pfeifer Carmem S.
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49040
Subject(s) - flexural strength , materials science , ceramic , composite material , cement , elastic modulus
This study evaluated the effects of thiourethane (TU) additives on the flexural strength ( σ 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 ( σ f ) and elastic modulus ( E f ) of the cements were measured in three‐point bending ( n = 8). Biaxial flexural strength ( σ bf ) of ceramic discs with and without cement layering were determined using a ball‐on‐ring setup. The σ 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 ( α = .05). Results σf 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 σ bf . The σ bf of RU, AR, and AL were significantly higher than EC and unfilled resin group. At z = − t 2 , RU had significantly higher σ bf . Significance All resin cements were able to strengthen the ceramic, with the TU‐modified material presenting similar results to the commercial material.