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Proceedings Paper

Effect of CO2 laser on dentinal bonding
Author(s): Douglas N. Dederich; Kenneth W. Hinkelman; Andrew Albert; John Tulip
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Paper Abstract

Previous studies have suggested that pulsed laser energy can enhance the bond strengths to dentin of certain dentinal bonding agents. The objective of this study was to investigate and compare the shear bond strength of Scotchbond 2 dentin adhesive (3M) to continuous-wave carbon dioxide laser-irradiated vs. unirradiated dentin. Forty extracted molars were mounted in an acrylic base with the crowns exposed. Dentin surfaces of diameters greater than 5mm were cut perpendicular to the base of the acrylic, treated for 60 seconds with dentin primer, air-dried, and randomly distributed into two groups. The experimental was exposed to CW-C02 laser irradiated at 13.5W for 0.10 sec., and a spot diameter of 5mm. The other group served as the nonirradiated control. A brass ring of 4mm internal diameter was placed on each surface and filled to a depth of 1.0mm with SB 2 and cured. P-50 (3M) composite was condensed and cured into the rings in three one-millimeter increments and then shear strength tested on an Instron machine using a crosshead speed of 0.005 in/mm. The mean shear strength and strain values for the irradiated and control group were 2. 193 MPa, 3.87 x i03, 1 .023 MPa, and 3.3 1 x iO, respectively. Pillai's Criterion and the Univariate F-test indicated that the mean shear strengths were significantly different (p=O.Ol49). These results suggest that dentin bond shear strengths may be enhanced by CWCO2 laser pretreatment.

Paper Details

Date Published: 1 June 1990
PDF: 5 pages
Proc. SPIE 1200, Laser Surgery: Advanced Characterization, Therapeutics, and Systems II, (1 June 1990); doi: 10.1117/12.17488
Show Author Affiliations
Douglas N. Dederich, Univ. of Alberta (Canada)
Kenneth W. Hinkelman, Univ. of Alberta (Canada)
Andrew Albert, Univ. of Alberta (Canada)
John Tulip, Univ. of Alberta (Canada)

Published in SPIE Proceedings Vol. 1200:
Laser Surgery: Advanced Characterization, Therapeutics, and Systems II
Stephen N. Joffe; Kazuhiko Atsumi, Editor(s)

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