Longitudinal bond strength evaluation using the deproteinized dentin technique.
This study evaluated bond strength to dentin as a result of storage time for conventional adhesive systems (with or without collagen) that had been deproteinized with 10% sodium hypochlorite (NaOCl). For this study, 72 human molars were sectioned in a mesiodistal axial plane and embedded in acrylic resin; at that point, the vestibular and lingual surfaces were worn down with abrasive paper. Acid etching was performed for 15 seconds (using 37% phosphoric acid) and the specimens were divided into 12 groups (n = 6), depending on the adhesive system used, the dentin treatment performed, and the length of evaluation (24 hours or six months). A resin composite was inserted over the prepared area with the aid of a metal matrix. Following a mechanical shear test, fractured surfaces were analyzed by stereomicroscope and the data were submitted to ANOVA and Tukey's test. It was concluded that the dentin deproteinization treatment with 10% NaOCl improved the bond strength in five of the six groups. The bond strength after 24 hours was significantly higher than the bond strength measured after six months. Of the three adhesive systems tested in this study, DenTASTIC UNO demonstrated the lowest bond strength.
Silva
Gleyce Oliveira
GO
Clinical Research Academic Group (GAPEC), Sao Jose dos Campos School of Dentistry, Sao Paulo State University, SP, Brazil.
Barcellos
Daphne Camara
DC
Pucci
Cesar Rogerio
CR
Borges
Alessandra Buhler
AB
Torres
Carlos Rocha Gomes
CR
D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D045662:Dental Etching / Q000379:methods; D003799:Dental Stress Analysis; D003804:Dentin / Q000737:chemistry / Q000187:drug effects*; D017220:Dentin-Bonding Agents; D006801:Humans; D008689:Methacrylates; D008963:Molar; D010756:Phosphoric Acids / Q000494:pharmacology; D011109:Polymethacrylic Acids; D019279:Resin Cements; D033081:Shear Strength; D012973:Sodium Hypochlorite / Q000494:pharmacology; D018709:Statistics, Nonparametric; D013997:Time Factors
D003188:Composite Resins; C103501:Dentastic; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D010756:Phosphoric Acids; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; D019279:Resin Cements; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate; D012973:Sodium Hypochlorite; C030242:phosphoric acid