Marginal microleakage of class II composite resin restorations due to restorative techniques
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Data
2010
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Resumo
Purpose: To evaluate the marginal microleakage of class II composite resin (CR) restorations
due to restorative techniques.
Methods: Forty human extracted premolars were assigned to 4 groups (n=10). Class II cavities
were prepared (4-mm wide, 2-mm axially, with the gingival margin located 1 mm beyond the
cementum-enamel-junction), and the restorative adhesive system Prime & Bond 2.1/TPH 3
(Dentsply) was used. CR was inserted by the oblique incremental technique (OIT) and cured
in continuous exposure. The restoratives techniques were: group 1 (control): OIT; group 2:
flowable resin (1 mm) applied in the gingival wall + OIT; group 3: OIT + three pre-cured
spheres inserted in the first increment of CR; and, group 4: OIT + strip of fiberglass inserted
in the first increment of CR. The specimens were subjected to a thermocycling regimen of 500
cycles (1 min at 5o-37o-55oC), coated with two layers of nail varnish up to 1 mm from the
restoration margins, and immersed in 0.5% basic fuchsine solution for 24 h. The extension
of dye penetration at the cervical wall (μm) was evaluated using an optic microscope at x40.
Data were analyzed using analysis of variance (ANOVA) (α=0.05).
Results: The microleakage values were: G1: 370 μm ± 241; G2: 398 μm ± 354; G3:
205 μm ± 119; and G4: 413 μm ± 340. No statistically significant differences were found
among the restorative techniques (P=0.081).
Conclusion: Marginal microleakage values were not influenced by the different restorative
techniques tested.
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Palavras-chave
Composite resin, Restorative technique, Marginal microleakage, Resina composta, Microinfiltração marginal, Técnica restauradora
Citação
CARVALHO, Andreia A. et al. Marginal microleakage of class II composite resin restorations due to restorative techniques. Revista Odonto Ciência, Porto Alegre, v. 25, n. 2, p. 165-169, 2010.