IADR Abstract Archives

Bond Strength and Fluoride Release Capabilities of Three Cements

Purpose: To evaluate dentin-cement bond strength to and fluoride release of Clearfil SA Cement [(CS)/Kuraray America], FujiCEM [(GC)/GC America], and Maxcem Elite [(ME)/Kerr Corp.]

Methods: Human third molars were sectioned sagitally in a bucco-lingual direction in the proximal location and polished with 320-grit SiC discs. Composite stubs (5mm height/19.6 mm2 area) (Clearfil AP-X/Kuraray America) were air abraded with Al2O3 particles, ultrasonically cleaned, and bonded to the dentin specimens with the cements according to the manufacturers' instructions. Specimens were stored in water at 37°C for 24 hours and were debonded under shear load with a universal testing machine (Instron/1122) at a cross-head speed of 5 mm/min. Failure modes were determined using 100X magnification. Fluoride release specimens were disc-shaped, 13.5 mm in diameter and 1 mm thick and were polished to 0.25 µm. Specimens were conditioned in air for 24 hours at 37°C, and then stored in 10 ml of a phosphate buffered solution at pH 6.8 in individual containers at 37°C. Fluoride release was measured using direct potentiometry after 1 and 4 days of storage. Data were analyzed using ANOVA with Fisher's PLSD intervals (p<0.05)

Results: Means and (s.d) of shear bond strengths (MPa/n=8) are listed. Fisher's PLSD interval (p<0.001) among cements was 0.7 MPa. Failures sites were mixed. Values of fluoride release (ppm/n=8) after 1 and 4 days are listed. Fisher's PLSD intervals (p<0.001) between times and among cements were 0.3 and 0.4 ppm.

Property

ME

GC

CS

Bond strength to dentin (MPa)

9.7(0.4)

5.7(0.6)

8.1(1.0)

Fluoride release 1 day (ppm)

0.9(0.2)

9.8(0.5)

3.1(0.6)

Fluoride release from day 2 to day 4 (ppm)

1.3(0.1)

8.3(1.0)

1.7(0.2)

Conclusions: There were significant differences in bond strengths and fluoride release among the three cements. GC showed the lowest bond strength and the highest F- release after 1 and 4 days. Acknowledgement: Kuraray America.


AADR/CADR Annual Meeting
2010 AADR/CADR Annual Meeting (Washington, D.C.)
Washington, D.C.
2010
14
Dental Materials 1: Adhesion - Bond Strength Testing and Mechanisms
  • Pinzon, Lilliam M.  ( University of California - San Francisco, San Francisco, CA, USA )
  • Khossoosi, Leila  ( University of California - San Francisco, San Francisco, CA, USA )
  • Powers, John M.  ( Dental Consultants, Inc, Ann Arbor, MI, USA )
  • Uskokovic, Vuk  ( University of California - San Francisco, San Francisco, CA, USA )
  • Habelitz, Stefan  ( University of California - San Francisco, San Francisco, CA, USA )
  • Watanabe, Larry G.  ( University of California - San Francisco, San Francisco, CA, USA )
  • Nonomura, Grace  ( University of California - San Francisco, San Francisco, CA, USA )
  • Marshall, Grayson W.  ( University of California - San Francisco, San Francisco, CA, USA )
  • Marshall, Sally J.  ( University of California - San Francisco, San Francisco, CA, USA )
    • Oral Session
    Adhesive-Enamel/Dentin Bond Strength
    03/03/2010