title: Effect of chlorhexidine application on microtensile bond strength to dentin.
abstract: This study evaluated the effect on microtensile bond strength (microTBS) of chlorhexidine application to dentin at different times during an indirect restoration luting procedure. Sixty bovine incisors had their superficial dentin subjected to 0.12% and 2% chlorhexidine solutions for 15 seconds before, during and after 37% phosphoric acid etching, resulting in six groups (n=10): 1) 0.12% chlorhexidine + etching; 2) 2% chlorhexidine + etching; 3) etching + 0.12% chlorhexidine; 4) etching + 2% chlorhexidine; 5) etching with 2% chlorhexidine; 6) etching without chlorhexidine (control). An adhesive system (Adper Single Bond 2) was applied and an indirect resin composite restoration (Filtek Z250) was luted using dual cured resin cement (Rely X ARC). After 24 hours of water storage, the specimens were tested by microtensile bond test (microTBS) at 0.5 mm/minute in a universal testing machine. The data were analyzed by one-way ANOVA (alpha=0.05), demonstrating no significant differences among the groups. The microTBS values in MPa were: 6: 22.83+/-3.53; 5: 22.4+/-3.52; 2: 21.62+/-2.5; 1: 21.28+/-3.17; 3: 19.62+/-2.05; 4: 19.55+/-2.34. The use of chlorhexidine at concentrations of 0.12% and 2% before, after or associated with acid etching did not significantly affect the microTBS values to dentin.
authors.affiliation: Operative Dentistry and Dental Materials Department Dental School, Federal University of Uberlândia, Minas Gerais, Brazil. carlosjsoares@umuarama.ufu.br
authors.forename: Carlos José
authors.initials: CJ
authors.lastname: Soares
authors.forename: Cristina Alves
authors.initials: CA
authors.lastname: Pereira
authors.forename: Janaína Carla
authors.initials: JC
authors.lastname: Pereira
authors.forename: Fernanda Ribeiro
authors.initials: FR
authors.lastname: Santana
authors.forename: Célio Jesus
authors.initials: CJ
authors.lastname: do Prado
mesh_terms: D000134:Acid Etching, Dental; D000818:Animals; D000891:Anti-Infective Agents, Local / Q000737:chemistry*; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002417:Cattle; D002710:Chlorhexidine / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003793:Dental Restoration, Permanent / Q000379:methods; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D008422:Materials Testing; D010756:Phosphoric Acids / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D000891:Anti-Infective Agents, Local; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; D010756:Phosphoric Acids; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; C115612:single bond; D014867:Water; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C030242:phosphoric acid; D002710:Chlorhexidine