Shear bond strength of self-etching adhesive systems to Er:YAG laser-prepared dentine with and without pulpal pressure simulation.
OBJECTIVE
This study was conducted to study the role of pulpal pressure on the shear bond strength of composite resin bonded to Er:YAG laser-prepared or bur-prepared dentine surfaces using a self-etching adhesive system.


METHODS
The occlusal surfaces of 80 human third molars were ground flat to expose the dentine. The dentine was prepared using either a carbide bur or an Er:YAG laser at 350 mJ/pulse and 10 Hz (fluence 44.5 J/cm(2)). Clearfil SE Bond was then applied with or without pressure. Rods of composite resin were bonded to dentine surfaces and shear bond tests were carried out.


RESULTS
When the Clearfil SE Bond was used without pressure, the difference between the shear bond strength values of bur-prepared and laser-prepared dentine surfaces was significant. When the Clearfil SE Bond was used with pressure, the difference of shear bond strength values was not significant between the two types of surface preparation.


CONCLUSIONS
The absence of smear layer formation during the preparation of the dentine by the Er:YAG laser did not improve the adhesion values of self-etching adhesive systems.
Brulat
Nathalie
N
Laboratory of Laser Technology and Oral Environment, University of Nice-Sophia Antipolis, Nice, France. nathalie.brulat@unice.fr
Leforestier
Eric
E
Rocca
Jean-Paul
JP
Darquet-Cerretti
Evelyne
E
Bertrand
Marie-France
MF
D003188:Composite Resins; D001840:Dental Bonding; D045662:Dental Etching; D003782:Dental Pulp; D003804:Dentin / Q000528:radiation effects*; D006801:Humans; D066298:In Vitro Techniques; D053844:Lasers, Solid-State; D008964:Molar, Third; D019279:Resin Cements; D033081:Shear Strength
C438313:Clearfil SE Bond; D003188:Composite Resins; D019279:Resin Cements