[The value of the CO2 laser for bonding composite resins to dentin].
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 sectioning, 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 Scotchbond 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.
Bouvier
D
D
UFR d'Odontologie, Lyon, France.
Duprez
J P
JP
Nguyen
D
D
Lissac
M
M
D003188:Composite Resins / Q000528:radiation effects*; D001840:Dental Bonding / Q000295:instrumentation* / Q000379:methods; D003804:Dentin / Q000528:radiation effects*; D017220:Dentin-Bonding Agents / Q000528:radiation effects; D006801:Humans; D066298:In Vitro Techniques; D007834:Lasers; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements; D013499:Surface Properties; D013718:Tensile Strength
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C041330:Scotchbond
Intérêt du laser CO2 pour l'adhésion des résines composites sur la dentine.