Rodrigues Junior SA, Pin LFDS, Machado G, Della Bona A, Demarco FF. Influence of different restorative techniques on marginal seal of class II composite restorations.
J Appl Oral Sci 2010;
18:37-43. [PMID:
20379680 PMCID:
PMC5349039 DOI:
10.1590/s1678-77572010000100008]
[Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2008] [Accepted: 08/11/2009] [Indexed: 11/29/2022] Open
Abstract
Objective
To evaluate the gingival marginal seal in class II composite restorations using
different restorative techniques.
Material and Methods
Class II box cavities were prepared in both proximal faces of 32 sound human third
molars with gingival margins located in either enamel or dentin/cementum.
Restorations were performed as follows: G1 (control): composite, conventional
light curing technique; G2: composite, soft-start technique; G3: amalgam/composite
association (amalcomp); and G4: resin-modified glass ionomer cement/ composite,
open sandwich technique. The restored specimens were thermocycled. Epoxy resin
replicas were made and coated for scanning electron microscopy examination. For
microleakage evaluation, teeth were coated with nail polish and immersed in dye
solution. Teeth were cut in 3 slices and dye penetration was recorded (mm),
digitized and analyzed with Image Tool software. Microleakage data were analyzed
statistically by non-parametric Kruskal-Wallis and Mann-Whitney tests.
Results
Leakage in enamel was lower than in dentin (p<0.001). G2 exhibited the lowest
leakage values (p<0.05) in enamel margins, with no differences between the
other groups. In dentin margins, groups G1 and G2 had similar behavior and both
showed less leakage (p<0.05) than groups G3 and G4. SEM micrographs revealed
different marginal adaptation patterns for the different techniques and for the
different substrates.
Conclusion
The soft-start technique showed no leakage in enamel margins and produced similar
values to those of the conventional (control) technique for dentin margins.
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