title: Effect of conditioners on bond durability of resin composite to Nd:YAP laser-irradiated dentin.
abstract: The aim of this study was to evaluate the effect of conditioners (sodium hypochlorite (NaOCl), Roth's ethylenediaminetetraacetic acid (EDTA), and phosphoric acid) on shear bond strength and morphology of Nd:YAP laser-irradiated dentin. In particular, the key focus was on the bond durability between resin composite and treated dentin after being subjected to thermocycling in artificial saliva between 5 degrees C and 55 degrees C. Results indicated that the application of phosphoric acid to laser-irradiated dentin produced a bond strength comparable to those using NaOCl and EDTA. Further, dentinal tubules which were closed after laser irradiation opened following the treatment with conditioners. When subjected to 3,000 thermocycles, the mean shear strength of the samples treated by the three conditioners following laser irradiation ranged from 9.7 to 12.6 MPa with a reduction of 25-33%--a reduction rate lower than that obtained using acid etching alone (50%). Among the three conditioners tested, only phosphoric acid treatment demonstrated an enhanced effect on bond durability of laser-irradiated dentin.
authors.affiliation: Department of Dentistry, Chung-Shan Medical University, Taichung, Taiwan, RO China.
authors.forename: Chun-Cheng
authors.initials: CC
authors.lastname: Chen
authors.forename: Tsui-Hsien
authors.initials: TH
authors.lastname: Huang
authors.forename: Chia-Tze
authors.initials: CT
authors.lastname: Kao
authors.forename: Shinn-Jyh
authors.initials: SJ
authors.lastname: Ding
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods; D003804:Dentin / Q000187:drug effects* / Q000528:radiation effects / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004492:Edetic Acid / Q000627:therapeutic use*; D006358:Hot Temperature / Q000009:adverse effects; D006801:Humans; D053685:Laser Therapy; D010756:Phosphoric Acids / Q000627:therapeutic use*; D011140:Polyurethanes / Q000737:chemistry; D033081:Shear Strength; D012973:Sodium Hypochlorite / Q000627:therapeutic use*
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D010756:Phosphoric Acids; D011140:Polyurethanes; D004492:Edetic Acid; D012973:Sodium Hypochlorite; C030242:phosphoric acid