Bond strength of two total-etching bonding systems on caries-affected and sound primary teeth dentin.
OBJECTIVE
As bond strength of currently available adhesive systems in caries-affected teeth dentin on primary tooth dentin was not well known, the bond strength of two bonding systems (PQI and OptiBond Solo Plus) was evaluated on caries-affected and sound primary molar tooth dentin and observed the micromorphology of the adhesive-dentin interfaces.


METHODS
By grinding both the sound (n = 30) and caries-affected (n = 30) approximal surfaces of teeth, flat dentin surfaces were obtained. The prepared surfaces were bonded with one of the each adhesive systems and a composite resin. After storing the bonded specimens in water at 37 degrees C for 24 h, the samples were sectioned and the bond strength of the adhesive systems was tested by the microshear test method. The data were statistically analysed.


RESULTS
Microshear bond strengths of PQI group for caries-affected and sound primary tooth dentin were 9.43 +/- 2.44 (MPa) and 9.32 +/- 2.95 (MPa) (P > 0.05), respectively, and the bond strengths of OptiBond Solo Plus group for caries-affected and sound primary tooth dentin were 15.33 +/- 3.59 (MPa) and 11.96 +/- 2.30 (MPa) (P < 0.05), respectively. Micromorphological features between sound and caries-affected dentin were similar in both PQI and OptiBond Solo Plus groups.


CONCLUSIONS
Both the adhesives showed significantly different bond strengths in caries-affected dentin but showed similar bond strengths in sound dentin.
Tosun
Gul
G
Department of Pediatric Dentistry, Faculty of Dentistry, Selçuk University, Konya, Turkey. gultosun@hotmail.com
Koyuturk
Alp Erdin
AE
Sener
Yagmur
Y
Sengun
Abdulkadir
A
D001840:Dental Bonding / Q000379:methods*; D003731:Dental Caries; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004812:Epidemiologic Methods; D006801:Humans; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D014094:Tooth, Deciduous / Q000648:ultrastructure
D017220:Dentin-Bonding Agents; C451600:OptiBond Solo Plus; D019279:Resin Cements