title: Bonding to sound vs caries-affected dentin using photo- and dual-cure adhesives.
abstract: This study aimed to evaluate the microtensile bond strength (microTBS) of photo- and dual-cure adhesives to sound and caries-affected dentin using total- and self-etch techniques. Human third molars with occlusal caries were prepared as previously described by Nakajima and others (1995). Dentin surfaces were bonded with Optibond Solo Plus (Kerr; photo-cure adhesive) or Optibond Solo Plus + Dual-cure activator (Kerr; dual-cure adhesive) with total- and self-etch technique. Clearfil AP-X (Kuraray) was used for composite buildups. Following storage in distilled water at 37 degrees C for 24 hours, the teeth were sectioned into 0.7-mm thick slices to obtain sound and caries-affected dentin slabs, then trimmed to form hour glass shapes with a 1 mm2 cross-sectional area. The specimens were subjected to microtensile testing using EZ-test (Shimadzu) at 1 mm/minute. Data were analyzed using three-way ANOVA and Student's t-Test (p<0.05). Bond strengths to sound dentin with photo- and dual-cure adhesives using total- and self-etch techniques were significantly higher than those to caries-affected dentin. Dual-cure adhesive significantly decreased bond strengths both to sound and caries-affected dentin. The total-etch technique showed no beneficial effect on caries-affected dentin compared with the self-etch technique. Scanning electron microscopic observation of the resin-dentin interfaces revealed that hybrid layers in caries-affected dentin were thicker than those observed in sound dentin with photo- and dual-cure adhesives. Resin infiltration into dentinal tubules of caries-affected dentin was hampered by the presence of mineral deposits.
authors.affiliation: Department of Operative Dentistry, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey. esracan@hotmail.com
authors.forename: Esra Can
authors.initials: EC
authors.lastname: Say
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Nakajima
authors.forename: Pisol
authors.initials: P
authors.lastname: Senawongse
authors.forename: Mübin
authors.initials: M
authors.lastname: Soyman
authors.forename: Füsun
authors.initials: F
authors.lastname: Ozer
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding; D003731:Dental Caries / Q000473:pathology*; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects* / Q000473:pathology; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents / Q000494:pharmacology; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D008963:Molar; D044367:Phase Transition; D019279:Resin Cements / Q000737:chemistry / Q000494:pharmacology; D013718:Tensile Strength
chemical_list: C112828:Clearfil AP-X; D003188:Composite Resins; C095997:DCR cement; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C451600:OptiBond Solo Plus; D019279:Resin Cements