Micro-shear bond strength of current one-step adhesives to cementum and dentin.
OBJECTIVE
To investigate the bonding performance of current one-step adhesives to human cementum and compare the results with those of two-step adhesives.


METHODS
Four commercially available adhesives were investigated: two one-step adhesives (Clearfil Tri-S Bond and G-Bond), and two two-step adhesives: a self-etch adhesive (Clearfil SE Bond) and a total-etch wet bonding adhesive (Adper Single Bond). The cementum and dentin regions were chosen from the mesial surface of extracted human molars and bonded with each adhesive. A micro-shear bond test was employed to evaluate the bond strength in this study. Morphological micrographs of cementum and dentin after etching, as well as bonded interfaces were obtained using scanning electron microscopy.


RESULTS
The shear bond test results showed significantly lower bonding of all adhesives when they were applied to cementum (P < 0.05). The mean bond strength values in MPa obtained from dentin and cementum were 33.7 and 26.7 for Clearfil Tri-S Bond, 28.9 and 22.4 for G-Bond, 42.9 and 35.2 for Clearfil SE Bond and 38.6 and 32.5 for Adper Single Bond, respectively. One-step adhesives showed significantly lower bond strengths than two-step adhesives to both cementum and dentin (P < 0.05).
Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. hokada890@gmail.com
Hiroshi
H
Okada
Alireza
A
Sadr
Yasushi
Y
Shimada
Junji
J
Tagami
D000134:Acid Etching, Dental / Q000379:methods; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D001840:Dental Bonding; D003739:Dental Cementum / Q000648:ultrastructure*; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry* / Q000145:classification; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D016369:Smear Layer; D013314:Stress, Mechanical; D013499:Surface Properties
C438313:Clearfil SE Bond; C515604:Clearfil Tri-S Bond; D017220:Dentin-Bonding Agents; C498353:G-Bond; D008689:Methacrylates; D019279:Resin Cements; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate