J Dent Res Dent Clin Dent Prospects. 2017;11(2):101-109.
doi: 10.15171/joddd.2017.019
PMID: 28748051
PMCID: PMC5519990
  Abstract View: 533
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Clinical Dentistry

Factors affecting marginal integrity of class II bulk-fill composite resin restorations

Siavash Savadi Oskoee 1, Mahmoud Bahari 1,2 * , Elmira Jafari Navimipour 1, Amir Ahmad Ajami 1, Negar Ghiasvand 3, Ayda Savadi Oskoee 1

1 Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
2 Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
3 Department of Operative Dentistry, Faculty of Dentistry, Urmia University of Medical Sciences, Urmia, Iran

Article

Background. Bulk-fill composite resins are a new type of resin-based composite resins, claimed to have the capacity to be placed in thick layers, up to 4 mm. This study was carried out to evaluate factors affecting gap formation in Cl II cavities restored using the bulk-fill technique. Methods. A total of 60 third molars were used in this study. Two Cl II cavities were prepared in each tooth, one on the mesial aspect 1 mm coronal to the CEJ and one on the distal aspect 1 mm apical to the CEJ. The teeth were divided into 4 groups: A: The cavities were restored using the bulk-fill technique with Filtek P90 composite resin and its adhesive system and light-cured with quartz tungsten halogen (QTH) light-curing unit. B: The cavities were restored similar to that in group A but light-cured with an LED light-curing unit. C: The cavities were restored using the bulk-fill technique with X-tra Fil composite resin and Clearfil SE Bond adhesive system and light-cured with a QTH curing unit. D: The cavities were restored similar to that in group C but light-cured with an LED light-curing unit. The gaps were examined under a stereomicroscope at ×60. Data were analyzed with General Linear Model test. In cases of statistical significance (P<0.05), post hoc Bonferroni test was used for further analyses. Results. The light-curing unit type had no effect on gap formation. However, the results were significant in relation to the composite resin type and margin location (P<0.001). The cumulative effects of light-curing unit*gingival margin and light-curing unit*composite resin type were not significant; however, the cumulative effect of composite rein type*gingival margin was significant (P=0.04) Conclusion. X-tra Fil composite exhibited smaller gaps compared with Filtek P90 composite with both light-curing units. Both composite resins exhibited smaller gaps at enamel margins.
© 2017 Savadi Oskoee et al. This is an Open Access article published and distributed by Tabriz University of Medical Sciences under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Submitted: 10 Jun 2015
Accepted: 19 Apr 2017
First published online: 21 Jun 2017
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