Comparative study of the tensile strength of composite resin bonded to unlased and lased dentin

Authors

  • D Bouvier
  • J.P Duprez
  • D Nguyen
  • M Lissac

Keywords:

CO2 laser, adhesion, tensile bond strength test, scanning electronic microscopy

Abstract

CO2 laser irradiation brings about structural modifications at the dentin surface. The aim of this study was to compare the tensile strength of composite resin bonded to unlased dentin and lased dentin. Dentin specimens were prepared by vestibular surface sectionning, exposing a plane dentinal surface. 40 specimens received 20 individual laser impacts with a power of 4 W and a duration of 0.1 s. 20 specimens received no laser irradiation. Half of the 60 specimens was treated with Scotchbond 2™ and the other one with Schotchbond Multipurpose™. Composite cylinders were polymerised for 40 seconds to these specimens. Tensile bond strengths were determined at a crosshead speed of 5 mm/min and fractured surfaces were examined at SEM after the test. Unlased dentin had significantly higher bond strength that the lased dentin.

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Published

2020-04-17

Issue

Vol. 37 No. 1-2 (1994)

Section

Original Research Articles

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I hereby certify that the authors of the above manuscript have all:

1. Conceived, planned, and performed the work leading to the report, or interpreted the evidence presented, or both;

2. Written the report or reviewed successive versions and shared in their revisions; and

3. Approved the final version.

Further, I certify that:

1. This work has not been published elsewhere and is not under revision in another journal;

2. Humane procedures have been followed in the treatment of experimental animals (if applicable);

3. Investigations in humans was done in accordance with the ethical standards of the responsible committee on human experimentation or with the Helsinki Declaration (if applicable).

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5. The copyright of the article is transferred from the authors to the Bulletin du Groupement International pour la Recherche Scientifique en Stomatologie et Odontologie upon acceptance of the manuscript.