[Ultrastructural study of sclerotic dentin in non-carious cervical lesions disposed by a total-etching dentin adhesive].
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.
Zhou
Li-jing
LJ
Department of Prosthodontics, Peking University Stomatological Hospital, Beijing 100081, China.
Tan
Jian-guo
JG
Hu
Bai-he
BH
Feng
Hai-lan
HL
D000134:Acid Etching, Dental; D001840:Dental Bonding; D003809:Dentin, Secondary / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008855:Microscopy, Electron, Scanning
D017220:Dentin-Bonding Agents