title: Evaluation of pH, ultimate tensile strength, and micro-shear bond strength of two self-adhesive resin cements.
abstract: The aim of this study was to evaluate the pH, ultimate tensile strength (UTS), and micro-shear bond strength (µSBS) of two self-adhesive resin cements to enamel and dentin. Sound bovine incisors (n = 10) and two self-adhesive resin cements (i.e., RelyX U-100 and seT PP) were used. The pH of the resin cements was measured using a pH-indicator paper (n = 3). Specimens for UTS were obtained from an hourglass-shaped mold. For µSBS, cylinders with internal diameter of 0.75 mm and height of 0.5 mm were bonded to the flat enamel and dentin surfaces. Bonded cylinders were tested in the shear mode using a loop wire. The fracture mode was also evaluated. The cement seT PP showed a low pH; U-100 showed significantly higher UTS (49.9 ± 2.0) than seT PP (40.0 ± 2.1) (p < 0.05) and high µSBS to enamel (10.7 ± 3.7). The lowest µSBS was found for seT PP to dentin (0.7 ± 0.6); seT PP to enamel (4.8 ± 1.7), and for U-100 to dentin (7.2 ± 1.9), showing an intermediate µSBS value (p < 0.05). Adhesive failure was the most frequently observed failure mode. The resin cement that presented the lowest pH and UTS also presented the lowest micro-shear bond strength to enamel and dentin.
authors.affiliation: Department of Dentistry I, School of Dentistry, Universidade Federal do Maranhão, São Luis, MA, Brazil.
authors.forename: Luciana Artioli
authors.initials: LA
authors.lastname: Costa
authors.affiliation: Department of Dentistry I, School of Dentistry, Universidade Federal do Maranhão, São Luis, MA, Brazil.
authors.forename: Karina Kato
authors.initials: KK
authors.lastname: Carneiro
authors.affiliation: Department of Chemistry, Center of Sciences and Technology, Universidade Federal do Maranhão, São Luis, MA, Brazil.
authors.forename: Auro
authors.initials: A
authors.lastname: Tanaka
authors.affiliation: Department of Dentistry I, School of Dentistry, Universidade Federal do Maranhão, São Luis, MA, Brazil.
authors.forename: Darlon Martins
authors.initials: DM
authors.lastname: Lima
authors.affiliation: Department of Dentistry I, School of Dentistry, Universidade Federal do Maranhão, São Luis, MA, Brazil.
authors.forename: José
authors.initials: J
authors.lastname: Bauer
mesh_terms: D000818:Animals; D002417:Cattle; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000187:drug effects*; D003804:Dentin / Q000187:drug effects*; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D018709:Statistics, Nonparametric; D013499:Surface Properties / Q000187:drug effects; D013718:Tensile Strength; D013997:Time Factors
chemical_list: C528569:Rely-X; D019279:Resin Cements