In vitro microleakage of composite restorations prepared by Er:YAG/Er,Cr:YSGG lasers and conventional drills associated with two adhesive systems.
J Adhes Dent
; 11(3): 221-9, 2009 Jun.
Article
em En
| MEDLINE
| ID: mdl-19603586
ABSTRACT
PURPOSE:
The objective of this in vitro study was to compare the degree of microleakage of composite restorations performed by lasers and conventional drills associated with two adhesive systems. MATERIALS ANDMETHODS:
Sixty bovine teeth were divided into 6 groups (n = 10). The preparations were performed in groups 1 and 2 with a high-speed drill (HD), in groups 3 and 5 with ErYAG laser, and in groups 4 and 6 with Er,CrYSGG laser. The specimens were restored with resin composite associated with an etch-and-rinse two-step adhesive system (Single Bond 2 [SB]) (groups 1, 3, 4) and a self-etching adhesive (One-Up Bond F [OB]) (groups 2, 5, 6). After storage, the specimens were polished, thermocycled, immersed in 50% silver nitrate tracer solution, and then sectioned longitudinally. The specimens were placed under a stereomicroscope (25X) and digital images were obtained. These were evaluated by three blinded evaluators who assigned a microleakage score (0 to 3). The original data were submitted to Kruskal-Wallis and Mann-Whitney statistical tests.RESULTS:
The occlusal/enamel margins demonstrated no differences in microleakage for all treatments (p > 0.05). The gingival/dentin margins presented similar microleakage in cavities prepared with ErYAG, Er,CrYSGG, and HD using the etch-and-rinse two-step adhesive system (SB) (p > 0.05); otherwise, both ErYAG and Er,CrYSGG lasers demonstrated lower microleakage scores with OB than SB adhesive (p < 0.05).CONCLUSION:
The microleakage score at gingival margins is dependent on the interaction of the hard tissue removal tool and the adhesive system used. The self-etching adhesive system had a lower microleakage score at dentin margins for cavities prepared with ErYAG and Er,CrYSGG than the etch-and-rinse two-step adhesive system.
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Base de dados:
MEDLINE
Assunto principal:
Colagem Dentária
/
Resinas Compostas
/
Cimentos de Resina
/
Preparo da Cavidade Dentária
/
Infiltração Dentária
/
Restauração Dentária Permanente
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
J Adhes Dent
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Brasil