title: [Ultrastructural study of sclerotic dentin in non-carious cervical lesions disposed by a total-etching dentin adhesive].
abstract: OBJECTIVE
  To examine the ultrastructure of resin-infiltrated sclerotic dentine following the application of a three-step total-etching dentin adhesive.
  
  
  METHODS
  Naturally-occurring, non-carious cervical lesions on extracted premolars were bonded using a total-etching dentin adhesive-Scotchbond Multi-purpose. Artificially prepared wedge-shaped lesions were also made in sound premolars and restored using the same adhesive as control. The morphological change of the dentin surface conditioned with the etchant, and the hybrid zone and resin tags in the dentin-resin interface were studied by SEM.
  
  
  RESULTS
  Most dentinal tubules were obliterated by rod-like sclerotic casts in the non-carious cervical lesion, and could not be dissolved by Scotchbond Multi-purpose etchant. Both the hybrid zone and resin tags were observed in sclerotic dentin after restoration, although the resin tags were fewer and in lack of communications, the length of resin tags and the thickness of the hybrid zone were almost similar to those of the sound dentin.
  
  
  CONCLUSIONS
  Bonding to sclerotic dentin is different from sound dentin, and may be compromised by the fewer resin tags and communications.
authors.affiliation: Department of Prosthodontics, Peking University Stomatological Hospital, Beijing 100081, China.
authors.forename: Li-jing
authors.initials: LJ
authors.lastname: Zhou
authors.forename: Jian-guo
authors.initials: JG
authors.lastname: Tan
authors.forename: Bai-he
authors.initials: BH
authors.lastname: Hu
authors.forename: Hai-lan
authors.initials: HL
authors.lastname: Feng
mesh_terms: D000134:Acid Etching, Dental; D001840:Dental Bonding; D003809:Dentin, Secondary / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008855:Microscopy, Electron, Scanning
chemical_list: D017220:Dentin-Bonding Agents