Micro-tensile and micro-shear bond strengths of current self-etch adhesives to enamel and dentin.
OBJECTIVE
To evaluate the micro-tensile and micro-shear bond strengths of self-etch adhesives to enamel and dentin.


METHODS
Extracted human molars were ground to expose flat enamel or dentin surfaces using wet #600 grit SiC paper. The enamel and dentin surfaces were assigned to four groups of four adhesives: three one-step self-etch adhesives (Clearfil S3 Bond; AQ Bond Plus, G-Bond) and a two-step self-etch adhesive (Clearfil SE Bond). Each of the adhesives were applied to the enamel or dentin surfaces in accordance with the manufacturers' instructions and restored with resin composite (Clearfil AP-X). The bonded teeth were then prepared for either micro-tensile or micro-shear bond strength tests. After storage in saline at 37 degrees C for 24 hours, specimens were stressed at a crosshead speed of 1 mm/minute. Mean bond strengths and modes of failure were analyzed using one-way ANOVA followed by Scheffe's F test and the Chi-square test, respectively, at a 95% level of confidence.


RESULTS
SE Bond produced significantly higher values than the one-step adhesives in the micro-shear bond test to enamel (P< 0.05), while no significant differences were found among the adhesives in the micro-tensile bond test (P> 0.05). For dentin, SE Bond showed the highest bond strengths in both micro-tensile and micro-shear bond tests; values were significantly higher than both AQ Bond Plus and G-Bond (P< 0.05).
Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. ishikawa.opc@tmd.ac.jp
Ayano
A
Ishikawa
Yasushi
Y
Shimada
Richard M
RM
Foxton
Junji
J
Tagami
D000269:Adhesives / Q000737:chemistry*; D000704:Analysis of Variance; D016009:Chi-Square Distribution; D016001:Confidence Intervals; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel; D003804:Dentin; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D033081:Shear Strength; D013718:Tensile Strength
D000269:Adhesives; D017220:Dentin-Bonding Agents