Journal of Dental Research, Vol 70, 1537-1541, Copyright © 1991 by International & American Associations for Dental Research Online Journals
Influence of carboxylic anhydrides on selected mechanical properties of heat-cured resin composites
A. Peutzfeldt and E. Asmussen
Department of Dental Materials and Technology, Royal Dental College, Copenhagen, Denmark.
Resin composites are still in need of improved abrasion resistance for them
to be ideal restorative materials for use in large occlusal cavities. The
present study proposes a concept for additional cross-linking of dental
monomers, by which mechanical properties and possibly the resistance to
abrasion of the resin composites are increased. Cyclic acid anhydrides were
added as cross-linking agents to different monomer mixtures, which were
then loaded with filler. The monomer mixtures were varied with respect to
type and ratio of monomer and anhydride. For measurement of diametral
tensile strength, flexural strength, modulus of elasticity, and modulus of
resilience, specimens were initially cured by light and then post-cured for
one h at 150 degrees C. Resin composites based on UEDMA and HEMA were found
to be superior to BISGMA- and TEGDMA-based composites. Increases in
mechanical properties were highest when unsaturated anhydrides were used.
An optimal effect of anhydride addition was found in resin composites also
containing methacrylamide. Such materials resulted in a 20% increase in the
mechanical properties investigated.
