[Use of the CO2 laser in enamel-dentin bonding procedures: experimental findings].
The objective of this study is to verify if laser (CO2) preparation of dental tissues has an effect on the quality of the seal of composite fillings. Forty-eight cavities were filled with the Scotchprep/Scotchbond 2 system, using P 50 (3M) as filling material, following the clinical protocol of the system; 40 cavities had previously been treated with a CO2 laser Sharplan 1020 (SBM). The teeth were thermocycled (240 cycles 4 degrees C/55 degrees C), then placed in a 0.5% basic fuschine solution for 48 hours after isolation of the root dentin. After inclusion and section, the penetration of the coloring agent was examined at the interface tooth-filling. This was followed by examination of the interface composite-tooth with the Scan Electronic Microscope. In order to visualize a possible alteration of the dentinal seal, 4 cavities treated with laser were placed in a 0.5% basic fuschine solution for 48 hours after isolation of the root dentin. Four reference cavities were cut with a diamond bur on a high speed handpiece. The following results were obtained: 1) the dentinal permeability of the laser-treated samples increases markedly in comparison with the reference group. 2) the filling-tooth junction of the laser-treated samples were never dye-tight (contrary to the reference samples). 3) fissures were created in the enamel and the dentin. The Scan Electron Microscopy confirms these results.
Scherman
L
L
Faculté de Chirurgie Dentaire de Paris V.
Zeboulon
S
S
Goldberg
M
M
D002245:Carbon Dioxide; D003188:Composite Resins; D001840:Dental Bonding / Q000295:instrumentation*; D003738:Dental Cements; D003743:Dental Enamel / Q000528:radiation effects; D003763:Dental Leakage / Q000517:prevention & control*; D003804:Dentin / Q000528:radiation effects; D003806:Dentin Permeability; D006801:Humans; D007834:Lasers; D019279:Resin Cements
D003188:Composite Resins; D003738:Dental Cements; D019279:Resin Cements; D002245:Carbon Dioxide; C041330:Scotchbond
Utilisation du laser CO2 lors des procédures de collage amélo-dentinaire: arguments expérimentaux.