Comparison of Tooth Bonding Strengths of Self-etching Bonding Adhesives

Objectives: To test tooth bonding strength of an experimental all-in-one solvent free self-etching adhesive (SEA) in comparison with some of the commercial 6^th and 7^th generation self-etching dental bonding systems. Materials and Methods: Extracted human molars were mounted in self-curing acrylics in a Teflon mold of 1 X 1 inch cylinder. The occlusal portion of the tooth was sectioned with a diamond saw with copious amount of water to obtain flat enamel or dentin.  Then wet polished up to 320 grit SiC sandpaper (n=6 per group). The adhesives were applied following manufacture's instructions. Simile™ (Pentron) composite was used for the button build-up followed by 40” light curing using the Ultradent bonding jig. The dentin and enamel bonding strengths were tested after 24 hours submersed in water @37^oC.  The means and standard deviations were calculated after the test.  ANOVA and Student T test were applied. The bonding steps for each system were also compared. Results: Table below lists the adhesives tested, bond strength results, and the steps required. The same letter indicates the value of insignificance within that subgroup (p>0.05).

Bonding systems	Dentin MPa (S.D)	Enamel MPa (S.D.)	Bonding Steps
Experimental SEA (Pentron)	24.7 (5.7)a	22.6 (4.1)c	3
Opti-Bond All-in-one (Sybron/Kerr)	20.6 (6.8)a	22.5 (4.1)c	6
Clearfil S3 Bond (Kurraray Medical)	19.4 (5.0)a	13.0 (6.5)d	4
Adper Prompt L-pop (3M/ESPE)	18.2 (3.6)a	14.2 (4.0)d	6
OneCoat Self-Etching Bond (Coltene/Waldent)	17.2 (3.3)a	15.2 (5.3)d	7
AdheSE One Viva-Pen (Ivaclar Vivadent)	9.5 (2.4) b	9.5 (2.3)d	4
G-Bond (GC Corp.)	9.2 (3.4)b	12.0 (3.9)d	4

Conclusion: The experimental SEA has better or comparable dentin and enamel bonding strengths comparing to the commercial self-etching bonding systems tested.  The application of the SEA does not require air drying and takes less steps.