Microtensile bond strength of etch-and-rinse and self-etch adhesives to artificially created carious dentin.
This article evaluates a pH-cycling model for simulation of caries-affected and caries-infected dentin (CAD and CID, respectively) surfaces, by comparing the bond strength of an etch-and-rinse and a self-etch adhesive system. For both adhesives, bonding to sound dentin (SD) showed that the microtensile bond strength (μTBS) values of SD, CAD, and CID were SD > CAD > CID (P < 0.05). Knoop microhardness number mean values followed the same trend. Adhesive systems were not able to totally penetrate into CAD and CID, forming more irregular resin-dentin interdiffusion zones and atypical resin tags than SD. The tested in vitro pH-cycling caries model allowed the evaluation of specific dentin substrate alterations in response to μTBS. The type of dentin and its histological structure played an important role in etch-and-rinse and self-etch bonding, as lower μTBS values were attained in CAD and CID.
Maria Carolina Guilherme
MC
Erhardt
Maristela Maia
MM
Lobo
Marcelo
M
Goulart
Fabio Herrmann
FH
Coelho-de-Souza
Thiago Assuncao
TA
Valentino
Jatyr
J
Pisani-Proenca
Ewerton Nocchi
EN
Conceicao
Luiz Andre Freire
LA
Pimenta
D001840:Dental Bonding / Q000379:methods*; D003731:Dental Caries / Q000601:surgery*; D045662:Dental Etching / Q000379:methods*; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000627:therapeutic use*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D013718:Tensile Strength
D017220:Dentin-Bonding Agents