title: Bonding to NaOCl-treated dentin: effect of pretreatment with sodium toluene sulfinic acid.
abstract: OBJECTIVE
  The use of sodium hypochlorite (NaOCl) can decrease the bond strength of 4-META/MMA-TBB resin cement to root dentin. The aim of this in vitro study was to evaluate the effect of sodium toluene sulfinic acid (SA) as a pretreatment to increase bond strength to NaOCl-treated dentin.
  
  
  METHODS
  The root canal dentin of bovine teeth was treated with 6 methods: group 10-3 (10% citric acid/3% ferric chloride; control); group SA; group NC (sodium hypochlorite/10-3 solution); group NS-10-3 (NaOCl + sulfinic acid + 10-3 solution); group HSA-10-3 (NaOCl +H2O2 +NaOCl + sulfinic acid + 10-3 solution); group HO-10-3 (NaOCl + H2O2 + NaOCl +10-3 solution). The roots were then filled with Super-Bond C&B (SB) or Super-Bond sealer (SBS). Samples were stored in distilled water for 24 h at 37°C and then cross sectioned into five slabs (0.8 mm thick) that were subjected to "trimming" microtensile bond strength testing. All treated dentin surfaces and resin/dentin bond interfaces were analyzed under SEM.
  
  
  RESULTS
  Compared with the control, NaOCl treatment significantly decreased the resin/dentin bond strengths. However, SA treatment following NaOCl irrigation resulted in no significant differences of bond strength values.
  
  
  CONCLUSIONS
  Sulfinic acid was effective in restoring 4-META/MMA-TBB resin cement bond strength after NaOCl irrigation.
authors.affiliation: Dalian Stomatological Hospital, Dalian University, Dalian, China.
authors.forename: Xianghong
authors.initials: X
authors.lastname: Li
authors.forename: Weidong
authors.initials: W
authors.lastname: Ma
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Chen
authors.forename: Jiaming
authors.initials: J
authors.lastname: Zhao
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakata
authors.forename: Kumiko
authors.initials: K
authors.lastname: Tanaka
authors.forename: Kei
authors.initials: K
authors.lastname: Takahashi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nishitani
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yoshiyama
mesh_terms: D000818:Animals; D001896:Boron Compounds; D002417:Cattle; D001840:Dental Bonding / Q000379:methods*; D003786:Dental Pulp Cavity; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects* / Q000648:ultrastructure; D003806:Dentin Permeability / Q000187:drug effects; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements; D012388:Root Canal Irrigants / Q000494:pharmacology; D012973:Sodium Hypochlorite / Q000494:pharmacology; D013718:Tensile Strength; D014050:Toluene / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D001896:Boron Compounds; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; D019279:Resin Cements; D012388:Root Canal Irrigants; D014050:Toluene; C049495:Super-bond; D012973:Sodium Hypochlorite; C065428:4-toluenesulfinic acid