title: Multiple coatings can improve the bond durability of one-step self-etching adhesive to primary dentin.
abstract: OBJECTIVE
  To investigate whether multiple coatings can improve the bond durability of one-step self-etching adhesive to primary dentin.
  
  
  METHODS
  Twelve caries-free human primary molars were randomly divided into 2 groups. In group 1, each tooth was hemisected into 2 halves. One half was assigned to the control subgroup 1, which was bonded with a commercially available one-step self-etching adhesive according to the manufacturer's instructions; the other half was assigned to experimental subgroup 1, in which the adhesive was applied three times before light curing. In group 2, one split half tooth was bonded with a commercially available one-step self-etching adhesive according to the manufacturer's instructions; for the other half, three layers of adhesive were applied with each successive layer of light curing. Specimens were stored in 0.9% NaCl containing 0.02% sodium azide at 37℃ for 18 months and then were subjected to microtensile bond strength test and the fracture mode analysis.
  
  
  RESULTS
  When the adhesive was applied three times before light curing, the bond strength of the experimental subgroup 1 was significantly higher than that of the control subgroup 1 (47.46∓13.91 vs. 38.12∓11.21 MPa, P<0.05). When using the technique of applying multiple layers of adhesive with each successive layer of light curing, no difference was observed in bond strength between the control subgroup and the experimental subgroup (39.40±8.87 vs. 40.87±9.33 MPa, P>0.05).
  
  
  CONCLUSIONS
  Multiple coatings can improve the bond durability of one-step self-etching adhesive to primary dentin when using the technique of light-curing after applying 3 layers of adhesive.
authors: Department of Stomatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
authors: Lin
authors: L
authors: Ma
authors: Jian-feng
authors: JF
authors: Zhou
authors: Quan
authors: Q
authors: Jing
authors: Ji-zhi
authors: JZ
authors: Zhao
authors: Kuo
authors: K
authors: Wan
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000268:Adhesiveness; D002648:Child; D020099:Coated Materials, Biocompatible / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D003738:Dental Cements / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D017266:Dental Prosthesis; D019232:Dental Restoration Failure; D003804:Dentin / Q000737:chemistry / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000494:pharmacology*; D004595:Electroplating / Q000379:methods*; D019544:Equipment Failure Analysis; D006801:Humans; D008422:Materials Testing; D013718:Tensile Strength / Q000187:drug effects
chemical_list: D020099:Coated Materials, Biocompatible; D003738:Dental Cements; D017220:Dentin-Bonding Agents