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Mechanical and hydrolytic degradation of an Ormocer®-based Bis-GMA-free resin composite

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Abstract

Objectives

The aim of the study was to evaluate the mechanical stability of bisphenol A-glycidyl methacrylate (Bis-GMA) and Ormocer-based resin composites before and after water absorption and to examine water saturation.

Material and methods

Disc-shaped specimens of the Bis-GMA (Grandio SO, Voco) and the Ormocer-based (Admira Fusion, Voco) dental resin composites were produced, stored in water, and weighed after pre-determined times to measure the absorbed water. Bend bars were produced and stored for 24 h in dry conditions as well as in distilled water for 14 days or 60 days at 37 °C. The initial flexural strength (FS) under quasi-static loading and flexural fatigue strength (FFS) under cyclic loading were determined under 4-point bending. Fracture toughness (KIc) of both composites was measured using the single-edge-V-notch-beam (SEVNB) technique after the same storage conditions under 3-point bending.

Results

Within the first 14 days, storage conditions did not affect the initial FS of Grandio SO, while a significant drop in initial FS was observed for Admira Fusion after 2 weeks in water and most of the water was absorbed within this time. FFS for the Bis-GMA composite was not reduced before 2 months in water, whereas for the Ormocer®-based composite, there has been a significant decrease in strength after cyclic fatigue already at 2 weeks of water storage. KIc of Admira Fusion decreased significantly after both storage periods, while KIc of Grandio SO decreased only significantly after 2 weeks of water storage.

Conclusion

All mechanical properties of the Bis-GMA composite were superior to those of the Ormocer®-based material, except water sorption.

Clinical significance

Water storage seems to have a much more pronounced effect on the mechanical properties of Ormocer®-based dental composites in comparison to Bis-GMA-based composites.

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Acknowledgments

The present work was performed in partial fulfillment of the requirements for obtaining the degree “Dr. med. dent” for the author E.K.

Funding

The work was supported by the Department of Operative Dentistry and Periodontology, Dental Clinic 1, University Hospital, University of Erlangen-Nuremberg, Erlangen, Germany.

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Authors and Affiliations

  1. Zahnklinik 1 - Tahnerhaltung und Parodontologie, Forchungslabor für dentale Biomaterialien, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Glueckstrasse 11, 91054, Erlangen, Germany

    Elena Klauer, Renan Belli, Anselm Petschelt & Ulrich Lohbauer

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  1. Elena Klauer
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  2. Renan Belli
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Correspondence to Renan Belli.

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Klauer, E., Belli, R., Petschelt, A. et al. Mechanical and hydrolytic degradation of an Ormocer®-based Bis-GMA-free resin composite. Clin Oral Invest 23, 2113–2121 (2019). https://doi.org/10.1007/s00784-018-2651-3

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