title: Effects of surface conditioning on repair bond strengths of non-aged and aged microhybrid, nanohybrid, and nanofilled composite resins.
abstract: This study evaluates effects of aging on repair bond strengths of microhybrid, nanohybrid, and nanofilled composite resins and characterizes the interacting surfaces after aging. Disk-shaped composite specimens were assigned to one of three aging conditions: (1) thermocycling (5,000 ×, 5-55 °C), (2) storage in water at 37 °C for 6 months, or (3) immersion in citric acid at 37 °C, pH 3 for 1 week; a non-aged group acted as the control. Two surface conditionings were selected: intermediate adhesive resin application (IAR-application) and chairside silica coating followed by silanization and its specific IAR-application (SC-application). Composite resins, of the same kind as their substrate, were adhered onto the substrates, and repair shear bond strengths were determined, followed by failure type evaluation. Filler particle exposure was determined by X-ray photoelectron spectroscopy and surface roughness analyzed using scanning electron and atomic force microscopy. Surface roughness increased in all composite resins after aging, but filler particle exposure at the surface only increased after thermocycling and citric acid immersion. Composite resin type, surface conditioning, and aging method significantly influenced the repair bond strengths (p < 0.05, three-way analysis of variance) with the least severe effects of water storage. Repair bond strengths in aged composite resins after IAR-application were always lower in non-aged ones, while SC-application led to higher bond strengths than IAR-application after thermocycling and water storage. In addition, SC-application led to more cohesive failures than after IAR-application, regardless the aging method.
authors.affiliation: Department of BioMedical Engineering, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands. rinastiti@gmail.com
authors.forename: Margareta
authors.initials: M
authors.lastname: Rinastiti
authors.forename: Mutlu
authors.initials: M
authors.lastname: Özcan
authors.forename: Widowati
authors.initials: W
authors.lastname: Siswomihardjo
authors.forename: Henk J
authors.initials: HJ
authors.lastname: Busscher
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D019343:Citric Acid / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D058250:Dental Restoration Repair / Q000379:methods*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C474035:Filtek Supreme; C509998:Grandio; D008689:Methacrylates; D019279:Resin Cements; D012821:Silanes; C488002:Solobond Plus adhesive; C501891:Tetric EvoCeram; C502351:multilink adhesive system; C523291:quadrant anterior shine; D014867:Water; C017492:methacryloxypropyltrimethoxysilane; D019343:Citric Acid; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; C081713:Visio-Bond; C041330:Scotchbond