The effect of different preparation and etching procedures on the microleakage of direct composite veneer restorations.
OBJECTIVE
The aim of this in vitro study was to compare the microleakage of direct composite veneer restorations prepared by a conventional dental bur or Er,Cr:YSGG (erbium, chromium doped yttrium scandium gallium garnet) laser and etched with different procedures.


METHODS
Fifty maxillary incisor teeth prepared for direct veneers with gingival margins in dentin and incisal margins in enamel were randomly divided into five groups (n = 10): group 1 (control), prepared with diamond bur and etched with phosphoric acid; group 2, prepared with diamond bur and etched with Er,Cr:YSGG laser (Waterlase MD/Biolase); group 3, prepared with laser and not etched; group 4, prepared with laser and etched with phosphoric acid; and group 5, prepared and etched with laser. After the application of the etch and rinse adhesive system (Prime & Bond NT/Dentsply), teeth were restored with the nano ceramic restorative material (Ceram X Duo/Dentsply), subjected to thermocycling and immersed in 0.5% basic fuchsin dye for 24 h. The teeth were sectioned longitudinally and dye penetration was evaluated by a binocular stereomicroscope equipped with a measuring device. Data were analyzed by Kruskal-Wallis and Wilcoxon signed ranks tests. The level of significance was set at p = 0.05.


RESULTS
Significant differences were observed in enamel of the five groups (p < 0.05). Minimal microleakage was observed in groups 1 and 3. The highest microleakage was evaluated in group 5 (p < 0.05). No significant differences were found among the five groups in dentin (p > 0.05). No differences were recorded between the microleakage values in enamel and dentin within each group and this was valid for all groups (p > 0.05).


CONCLUSIONS
The results confirmed that enamel and dentin surfaces prepared with Er,Cr:YSGG laser for direct composite veneer restorations may provide comparable sealing.
Hacettepe University, School of Dentistry, Department of Restorative Dentistry, Ankara, Turkey. jgorucu@hacettepe.edu.tr
Jale
J
Gorucu
Sevil
S
Gurgan
Filiz Yalcin
FY
Cakir
Ceren Ozge
CO
Bicer
Hande
H
Gorucu
D000134:Acid Etching, Dental / Q000009:adverse effects / Q000379:methods*; D003737:Dental Cavity Preparation / Q000379:methods; D003743:Dental Enamel / Q000737:chemistry; D003754:Dental High-Speed Equipment; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000379:methods*; D006801:Humans; D066298:In Vitro Techniques; D007180:Incisor / Q000187:drug effects / Q000528:radiation effects; D053844:Lasers, Solid-State / Q000627:therapeutic use; D028022:Low-Level Light Therapy / Q000379:methods*; D010756:Phosphoric Acids / Q000737:chemistry* / Q000627:therapeutic use; D012680:Sensitivity and Specificity
D010756:Phosphoric Acids; C030242:phosphoric acid