Adhesives bonded to erbium:yttrium-aluminum-garnet laser-irradiated dentin: transmission electron microscopy, scanning electron microscopy and tensile bond strength analyses.
The aim of this in vitro study was to investigate the effect of erbium:yttrium-aluminum-garnet (Er:YAG) laser irradiation on dentinal collagen by transmission electron microscopy and to analyze the resin-dentin interface by scanning electron microscopy. A tensile bond strength test was also applied. Specimens from 69 sound human third molars were randomly divided into three groups: control (no laser), and two irradiated groups, laser 250 (250 mJ/2 Hz) and laser 400 (400 mJ/4 Hz). Then, specimens were restored with two adhesive systems, an etch-and-rinse or a self-etch system. Although ultrastructural examination showed a modified surface in the irradiated dentin, there was no statistical difference in bond strength values between the laser groups and controls (P < 0.05). In conclusion, the use of Er:YAG laser for ablating human dentin did not alter the main adhesion parameters when compared with those obtained by conventional methods, thus reinforcing its use in restorative dentistry.
Ramos
Andreia Cristina Bastos
AC
School of Dentistry, University of Fortaleza, Fortaleza, CE, Brazil. aramos@unifor.br
Esteves-Oliveira
Marcella
M
Arana-Chavez
Victor E
VE
de Paula Eduardo
Carlos
C
D003094:Collagen / Q000528:radiation effects / Q000648:ultrastructure; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements; D045662:Dental Etching; D003793:Dental Restoration, Permanent / Q000379:methods; D003804:Dentin / Q000528:radiation effects* / Q000648:ultrastructure*; D006801:Humans; D066298:In Vitro Techniques; D053844:Lasers, Solid-State / Q000627:therapeutic use*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D013718:Tensile Strength
D003738:Dental Cements; D003094:Collagen