Comparative study of the dentin/adhesive systems interface after treatment with Er:YAG laser and acid etching using scanning electron microscope.
OBJECTIVE
To assess dentin/adhesive systems interface after dentin conditioning with Er:YAG laser.


METHODS
Twenty-four dentin half-disks were assigned to 3 groups: All Bond 2 (AB); Optibond Solo Plus (OP); and Clearfil Liner Bond 2V (CL), which were divided into three sub-groups, according to dentin surface treatment: Er:YAG laser; Er:YAG laser plus acid; acid solely. After the adhesive protocol, specimens were embedded in resin, sectioned, and prepared for SEM analysis. Each area was examined under 1,500x magnification to assess the hybrid layer.


RESULTS
Acid conditioning provided to AB and OP thick and homogeneous hybrid layer, as well as conical and uniform tags. The same pattern was observed for CL. In general, dentin treatment with laser, even when associated to acid, promoted irregular and thin hybrid layer, as well as scarce and thin tags.


CONCLUSIONS
Er:YAG laser influenced the adhesive systems interface, hampering hybrid layer formation.
Sassi
Juliano F
JF
Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo (USP), Av. do Café, s/n, Monte Alegre, 14040-904, Ribeirão Preto, São Paulo, Brazil.
Chimello
Daniela T
DT
Borsatto
Maria C
MC
Corona
Silmara A M
SA
Pecora
Jesus D
JD
Palma-Dibb
Regina Guenka
RG
D000134:Acid Etching, Dental; D003188:Composite Resins; D003804:Dentin / Q000000981:diagnostic imaging*; D017220:Dentin-Bonding Agents; D006801:Humans; D066298:In Vitro Techniques; D007834:Lasers; D008855:Microscopy, Electron, Scanning; D014016:Tissue Conditioning, Dental; D014463:Ultrasonography
D003188:Composite Resins; D017220:Dentin-Bonding Agents; C111840:flowable hybrid composite