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Quintessence Publishing: Journals: JAD


The Journal of Adhesive Dentistry

Edited by Prof. Dr. Roland Frankenberger, Prof. Bart Van Meerbeek

ISSN (print) 1461-5185 • ISSN (online) 1757-9988


May/June 2013
Volume 15 , Issue 3

Pages: 245-250
PMID: 23534010
DOI: 10.3290/j.jad.a28603
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Shrinkage Kinetics of a Methacrylate- and a Silorane-based Resin Composite: Effect on Marginal Integrity

Gregor, Ladislav / Bortolotto, Tissiana / Feilzer, Albert J. / Krejci, Ivo

Purpose: To evaluate the relation between the linear displacement (LD), shrinkage force (SF) and marginal adaptation of a methacrylate- and a silorane-based composite. Materials and Methods: The LD and SF of 8 samples made of Filtek Supreme XT (methacrylate-based composite) and Filtek Silorane (silorane-based composite) were measured for 180 s from the start of polymerization. Large bulk-filled Class I cavities were restored with both resin composites, and two C-factors were simulated by applying the same adhesive system in different ways: the Silorane System Adhesive (SSA) was applied on enamel and dentin (C-factor 3.5) or only on enamel margins (C-factor of 0.4). Percentages of continuous margins (%CM) were quantitatively assessed with SEM before and after simultaneously loading with 1.2 million mechanical occlusal cycles (49 N; 1.7 Hz) and 3000 thermal cycles (5C to 50C) under dentinal fluid simulation. Results: Significantly lower scores of LD and SF were observed for Filtek Silorane (LD: 12.0 m 1.3, SF: 13.7 N 1.0) than for Filtek Supreme XT (LD: 25.0 m 0.6, SF: 36.3 N 2.9). Both variables, ie, composite type and C-factor, had a significant effect on marginal adaptation (p < 0.05). In the groups with high C-factor (SSA was applied on the entire cavity surface) percent of continuous margin (%CM) (mean SD) before and after loading, respectively, was 24.4 16.6 and 2.1 2.4 for Filtek Supreme XT, and 58.8 9.9 and 35.4 4.1 for Filtek Silorane. When adhesion was confined to enamel margins (lower C-factor), %CM before and after loading, respectively, increased to 76.1 9.6 and 64.2 11.5 for Filtek Supreme XT, and 96.6 1.7 and 94.2 2.1 for Filtek Silorane. Conclusions: The silorane-based composite exhibited significantly lower shrinkage forces and better marginal adaptation than did the methacrylate-based composite.

Keywords: marginal adaptation, silorane, polymerization shrinkage, C-factor

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