title: Effect of Steam Autoclaving on the Tensile Strength of Resin Cements Used for Bonding Two-Piece Zirconia Abutments.
abstract: The purpose of this study was to evaluate the effects of steam autoclave sterilization on the tensile strength of two types of resin cements used to bond customized CAD/CAM zirconia abutments onto titanium bases. Forty sets of zirconia abutments cemented to screwed titanium bases of implants analogs were divided into 4 groups (n = 10). Two groups were treated with a conventional chemically activated resin cement (ML, Multilink Ivoclar Vivadent) and the other two groups with a self-adhesive dual resin cement (RelyX U200, 3M ESPE). One group from each cement was submitted to steam autoclaving. The autoclave sterilization cycle was performed after 72 hours of cementation for 15 minutes at 121°C and 2.1 Kgf/cm2. The samples were subjected to tensile strength testing in a universal testing machine (200 Kgf, 0.5 mm/min), from which the means and standard deviations were obtained in Newtons. Results showed (via ANOVA and Tukey's test; α = 0.05) that in the absence of steam autoclaving, no difference was observed in tensile strength between the cements tested: ML: 344.87 (93.79) and U200: 280 (92.42) (P = .314). Steam autoclaving, however, significantly increased tensile strength for the ML: 465.42 (87.87) compared to U200: 289.10 (49.02) (P < .001). Despite the significant increase in the ML samples (P = .013), autoclaving did not affect the tensile strength of the U200 samples (P > 0.05). The authors concluded that steam autoclaving increases the mean tensile strength of the chemically activated cement compared to the dual-cure self-adhesive cement. The performance of both cements evaluated was similar if the sterilization step was disconsidered.
authors.affiliation: São Leopoldo Mandic Institute and Dental Research Center, Campinas/SP, Brazil.
authors.forename: Marcos Alexandre
authors.initials: MA
authors.lastname: Fadanelli
authors.affiliation: São Leopoldo Mandic Institute and Dental Research Center, Campinas/SP, Brazil.
authors.forename: Flávia Lucisano Botelho do
authors.initials: FL
authors.lastname: Amaral
authors.affiliation: São Leopoldo Mandic Institute and Dental Research Center, Campinas/SP, Brazil.
authors.forename: Roberta Tarkany
authors.initials: RT
authors.lastname: Basting
authors.affiliation: São Leopoldo Mandic Institute and Dental Research Center, Campinas/SP, Brazil.
authors.forename: Cecilia Pedroso
authors.initials: CP
authors.lastname: Turssi
authors.affiliation: São Leopoldo Mandic Institute and Dental Research Center, Campinas/SP, Brazil.
authors.forename: Bruno Salles
authors.initials: BS
authors.lastname: Sotto-Maior
authors.affiliation: São Leopoldo Mandic Institute and Dental Research Center, Campinas/SP, Brazil.
authors.forename: Fabiana Mantovani Gomes
authors.initials: FM
authors.lastname: França
mesh_terms: D001840:Dental Bonding; D003799:Dental Stress Analysis; D008422:Materials Testing; D019279:Resin Cements; D013227:Steam; D013718:Tensile Strength; D015040:Zirconium
chemical_list: D019279:Resin Cements; D013227:Steam; D015040:Zirconium; C028541:zirconium oxide
keywords: dental implant-abutment design; resin cements; sterilization; tensile strength