Effect of light-curing units on gap formation and microleakage of class II composite restorations

  • Giovana Mongruel Gomes State University of Ponta Grossa
  • Bruna Fortes Bittencourt State University of Ponta Grossa
  • Gibson L. Pilatti State University of Ponta Grossa
  • João Carlos Gomes State University of Ponta Grossa
  • Osnara Maria Mongruel Gomes State University of Ponta Grossa
  • Abraham Lincoln Calixto State University of Ponta Grossa

Abstract

Aim: This in vitro study evaluated gap width formation and marginal microleakage in Class II composite restorations light-cured with three different light-curing units. Methods: Standardized cavities in the proximal surfaces of 36 human third molars were made with margins located below the cementoenamel junction. Cavities were restored with Filtek P60 (3M ESPE), inserted with a photocondenser tip and light-cured with three different methods: GI - Optilux401 (halogen); GII – ColtoluxLED (LED) and GIII –UltraLumeLED5 (LED). After finishing the restorations, teeth were subjected to a thermal cycling regimen of 500 cycles (5o C ± 2o C and 55o C ± 2o C), totalizing 500 cycles. Thereafter, the teeth were sectioned in a buccolingual direction and in the center of the restorations. Half of the specimens (18) were used to evaluate marginal microleakage, by measuring of dye penetration in cross-sectioned specimens, and the other half was used to analyzed the gap formation width by SEM observations (1000X). Data were submitted to Kruskal-Wallis (α=0.05). Results: The mean values of gap width (µm) were: GI 3.28±3.34; GII 1.48±1.89 and GIII 3.11±3.45, and microleakage was not affected by the light-curing units. Conclusions: There were no differences between the light-curing methods in gap formation and marginal microleakage.

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Author Biographies

Giovana Mongruel Gomes, State University of Ponta Grossa
DDS, MS, PhD student, Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa
Bruna Fortes Bittencourt, State University of Ponta Grossa
DDS, MS, PhD student, Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa
Gibson L. Pilatti, State University of Ponta Grossa
DDS, MS, PhD, Professor, Department of Periodontology, School of Dentistry, State University of Ponta Grossa
João Carlos Gomes, State University of Ponta Grossa
DDS, MS, PhD, Professor, Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa
Osnara Maria Mongruel Gomes, State University of Ponta Grossa
DDS, MS, PhD, Professor, Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa
Abraham Lincoln Calixto, State University of Ponta Grossa
DDS, MS, PhD, Professor, Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa
Published
2015-11-05
How to Cite
Gomes, G. M., Bittencourt, B. F., Pilatti, G. L., Gomes, J. C., Gomes, O. M. M., & Calixto, A. L. (2015). Effect of light-curing units on gap formation and microleakage of class II composite restorations. Brazilian Journal of Oral Sciences, 10(4), 262-267. https://doi.org/10.20396/bjos.v10i4.8641612
Section
Article

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