The results were analyzed using anova tests (P 0♰5). Dynamic modulus was determined by an impulse excitation technique, static elastic moduli and flexural strength by a three-point bending method. Inorganic fillers were quantified by thermogravimetric analysis and morphologically characterized by scanning electron microscopy. Two Ormocers (Admira and an experimental Ormocer V35694), one ring-opening composite (Filtek Silorane) and five methacrylate-based composites were tested. The aim of this study was to characterize the inorganic fraction of materials belonging to each type and to compare their mechanical properties. Summary Three types of low-shrinkage composites are today commercially available: Ormocers, cationic ring-opening curing systems and highly filled methacrylate-based materials, which cure via free-radical polymerization mechanisms.
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