title: Shear bond strength of direct composite repairs in indirect composite systems.
abstract: Indirect composite restorations may require repair during clinical service. This study evaluated the shear bond strength of direct composite repairs in indirect composites after four surface treatment procedures. Cylinders of three indirect composites (n = 10 per group) received the following surface treatment: sandpaper finishing (control group), 50 microm aluminum oxide sandblasting, 50 microm aluminum oxide sandblasting (plus 10% fluoridric acid etching), and 30 microm silaned silicon sandblasting. Repair procedure was simulated with the application of an adhesive agent and packing of a direct composite. After storage for one hour in relative humidity and 23 hours in distilled water at 37 degrees C, the specimens were tested for shear bond strength using a universal testing machine at a crosshead speed of 0.5 mm/min. Groups treated with aluminum oxide sandblasting or CoJet Sand had the highest mean values of shear bond strength with no statistically significant difference between the two techniques.
authors.affiliation: Department of Prosthodontics, Pontifical Catholic University, Porto Alegre, RS, Brazil.
authors.forename: Andre Pontes
authors.initials: AP
authors.lastname: Pontes
authors.forename: Hugo Mitsuo Silva
authors.initials: HM
authors.lastname: Oshima
authors.forename: Joao Felipe Mota
authors.initials: JF
authors.lastname: Pacheco
authors.forename: Jose Luiz
authors.initials: JL
authors.lastname: Martins
authors.forename: Rosemary Sadami Arai
authors.initials: RS
authors.lastname: Shinkai
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods; D017269:Dental Prosthesis Repair; D003799:Dental Stress Analysis; D006801:Humans; D007284:Inlays; D016014:Linear Models; D008422:Materials Testing; D008689:Methacrylates; D019279:Resin Cements; D033081:Shear Strength; D013499:Surface Properties
chemical_list: C498018:Artglass (dental composite); D003188:Composite Resins; D008689:Methacrylates; D019279:Resin Cements; C113676:Solidex; C110370:belleGlass; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate