J Dent Res Dent Clin Dent Prospects. 2017;11(1):36-42.
doi: 10.15171/joddd.2017.007
PMID: 28413594
PMCID: PMC5390124
  Abstract View: 526
  PDF Download: 590

Clinical Dentistry

The effect of repeated preheating of dimethacrylate and silorane-based composite resins on marginal gap of class V restorations

Parnian Alizadeh Oskoee 1,2, Fatemeh Pournaghi Azar 3, Elmira Jafari Navimipour 4, Mohammad Esmaeel Ebrahimi chaharom 4, Fereshteh Naser Alavi 5 * , Ashkan Salari 6

1 Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
2 Professor, Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
3 Assistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
4 Associate Professor, Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
5 Postgraduate Student, Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
6 Postgraduate Student, Department of Periodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
*Corresponding Author; Email: minanasseralavi@yahoo.com

Abstract

Background. One of the problems with composite resin restorations is gap formation at resin‒tooth interface. The present study evaluated the effect of preheating cycles of silorane- and dimethacrylate-based composite resins on gap formation at the gingival margins of Class V restorations.

Methods. In this in vitro study, standard Class V cavities were prepared on the buccal surfaces of 48 bovine incisors. For restorative procedure, the samples were randomly divided into 2 groups based on the type of composite resin (group 1: di-methacrylate composite [Filtek Z250]; group 2: silorane composite [Filtek P90]) and each group was randomly divided into 2 subgroups based on the composite temperature (A: room temperature; B: after 40 preheating cycles up to 55°C). Marginal gaps were measured using a stereomicroscope at ×40 and analyzed with two-way ANOVA. Inter- and intra-group compari-sons were analyzed with post-hoc Tukey tests. Significance level was defined at P < 0.05.

Results. The maximum and minimum gaps were detected in groups 1-A and 2-B, respectively. The effects of composite resin type, preheating and interactive effect of these variables on gap formation were significant (P<0.001). Post-hoc Tukey tests showed greater gap in dimethacrylate compared to silorane composite resins (P< 0.001). In each group, gap values were greater in composite resins at room temperature compared to composite resins after 40 preheating cycles (P<0.001).

Conclusion. Gap formation at the gingival margins of Class V cavities decreased due to preheating of both composite re-sins. Preheating of silorane-based composites can result in the best marginal adaptation.

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Submitted: 04 May 2016
Accepted: 10 Jul 2017
First published online: 15 Mar 2017
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