Dentin Shear Bond Strength using 5th and 6th Generation Adhesives

Objectives: To compare the dentin bond strengths of several 5^th and 6^th generation dental adhesives.

Methods: Extracted human teeth were ground to expose superficial dentin and polished to 320 grit. Five adhesives were compared, (n=10): Moxie 5^th generation and Moxie SE 6^th generation (Discus Dental); Optibond Solo Plus 5^th generation and Optibond XTR 6^th generation (Kerr); and Clearfil SE Protect  6^th generation (Kuraray) to determine their shear bond strengths. Adhesives were cured for 20 seconds and each specimen was bonded to composite (SDI Glacier) following manufacturer’s instructions in a cylinder mold, d=2.3. After being placed in an incubator at 37°C for at least 24 hours, bond testing was performed using an Instron, and shear bond strengths were calculated in megapascals (MPa). Analysis was performed using ANOVA and post hoc Tukey test at 0.05 level of significance.

Results: The mean bond strengths, MPa, and standard deviations of the five adhesives were as followed: Moxie-5^th generation 9.1 (2.6), Moxie-6^th generation 9.4 (2.7), OptiBond-5^th generation 15.8 (3.6), OptiBond-6^th generation 15.3 (2.9), and Clearfil SE Protect 10.8 (2.9). The Optibond 5^th and 6^th generations were not significantly different from one another (p=0.73), however, they were significantly stronger than Moxie 5^th (p<0.001), Moxie 6^th (p<0.001), and Clearfil SE Protect (p=0.001), respectively. Moxie 5^th and 6^th generations were not significantly different from one another (p=.824). Clearfil SE Protect was not significantly different from Moxie 5^th generation (p=.206) or Moxie 6^th generation (p=.295).

Conclusions:

5^th generation Optibond Solo Plus adhesive showed similar dentin shear bond strengths to 6^th generation Optibond XTR.  Both generations of Optibond adhesives showed higher bond strengths than Clearfil SE Protect Bond, Moxie 5^th, and 6^th generation adhesives. Acknowledgements:  Materials were provided by the manufacturers.  Funds stipend was provided by The University of Texas Health Science Center at Houston School of Dentistry Research Office.