title: Evaluation of bond strength between leucite-based and lithium disilicate-based ceramics to dentin after cementation with conventional and self-adhesive resin agents.
abstract: The aim of this study was to compare the microtensile bond strength of two heat-pressed ceramics (leucite-based--IPS Empress Esthetic/Ivoclar Vivadent, and lithium disilicate-based --IPS e.max Press/Ivoclar Vivadent) to dentin with the use of conventional and self-adhesive resin cements. The occlusal surface of 60 intact human molars was removed and the dentin was exposed. Ceramic blocks were cemented randomly with regard to the cementation systems (n = 10): conventional dual resin cement (Variolink II/Ivoclar Vivadent), conventional self-polymerizing resin cement (Multilink/Ivoclar Vivadent), and dual self-adhesive resin cement (RelyX U100/3M ESPE). The dual cementation systems were photoactivated with a LED light device (Radii Cal, SDI) for 40 seconds. The specimens were sectioned to obtain sticks of approximately 1 mm2 for microtensile tests on a universal testing machine (EMIC). The type of fracture was analyzed under a scanning electron microscope. The Analysis of Variance (ANOVA) and the Tukey test (alpha = 0.05) showed that there was no difference between types of ceramic. Average microtensile bond strength was higher for the conventional dual resin cement (Variolink II) and the self-adhesive dual resin cement (RelyX U100), despite greater prevalence of premature loss of the sticks with the latter. Average bond strength was lower when the conventional self-polymerizing resin cement (Multilink) was used. Leucite-based and lithium disilicate-based cements present similar bond strength to the dentin with conventional dual resin cement (Variolink II) and a dual self-adhesive cement (RelyX U100).
authors.forename: Fernando J
authors.initials: FJ
authors.lastname: Rigolin
authors.forename: Milton E
authors.initials: ME
authors.lastname: Miranda
authors.forename: Flávia M
authors.initials: FM
authors.lastname: Flório
authors.forename: Roberta T
authors.initials: RT
authors.lastname: Basting
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D002484:Cementation / Q000379:methods*; D002516:Ceramics / Q000737:chemistry*; D055117:Curing Lights, Dental; D001840:Dental Bonding; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D058105:Polymerization; D019279:Resin Cements / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D000538:Aluminum Silicates; C508050:IPS e.max Press; C075815:IPS-Empress ceramic; C528569:Rely-X; D019279:Resin Cements; C493120:lithia disilicate; C502351:multilink adhesive system; D003776:Dental Porcelain; C078519:leucite; C103502:Variolink