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S. Schörpf, C. Gorsche, Y. Catel, N. Moszner, R. Liska:
"Urethane-based vinylcyclopropanes (VCPs) for low shrinkage dental composites";
Poster: Danube Vltava Sava Polymer Meeting 2017 DVSPM, Wien; 05.09.2017 - 08.09.2017; in: "DVSPM 2017", (2017), ISBN: 978-3-9504017-6-9; S. PO66.

Composite materials, which are used for dental restorations for more than 50 years are
gradually replacing amalgams. Such dental composites have led to a breakthrough in
modern dentistry since they are easy to manipulate, inexpensive and have excellent
esthetic properties. Their organic matrix is mainly based on monomers such as
dimethacrylates and additives (e.g. initiators, stabilizers, pigments). Before curing the
monomer molecules are located at van der Waals distance to each other, which changes
during curing with the formation of covalent bonds. This causes a volumetric shrinkage
of about 2.0 - 4.0 % during photocuring and has been a major challenge for research
and industry.trl The resulting shrinkage stress is supposed to generate microleakage,
marginal staining, secondary caries and post-operative sensitivity.
Cyclic monomers like vinylcyclopropanes (VCPs) exhibit dramatically reduced
shrinkage upon curing but so far, they have not found their place in restorative dentistry
due to their low reactivity. Recently, it was found that Ivocerin@, was able to
significantly increase the polymeri zalion rale of these monomers.[2] Composites based
on these new VCPs were shown to exhibit remarkably lower volumetric shrinkage and
shrinkage stress than methacrylate-based materials and in addition the presence of the
urethane group improved the mechanical properties.

Urethane-based vinylcyclopropanes (VCPs), low shrinkage dental composites