Novel Resins Could Reduce Shrinkage, Toughen Composites

may 29 2012

Esstech, a biomedical materials company, has explored that its novel line of Exothane elastomers fared better than traditional polymeric matrix resins used in dental composites. Esstech's results suggest that these materials could significantly improve dental composites, according to Jim Duff, a research chemist at Esstech. Duff presented his research, conducted with assistance from the University of Colorado, during a poster session at the recent American Academy for Dental Research (AADR) annual meeting in Tampa, FL.

It is expected to solve some different problems. The first and foremost is the issue of shrinkage, one of the biggest issues in restoratives. These materials will help out in the industry by having the low volumetric shrinkage and the high conversion. Additionally, they will help toughen up the composite so that they tend to flex rather than break or crack.

Their research found that Exothanes could enhance the strength and limit shrinkage in traditional dental restoratives utilizing methacrylate chemistry, which the industry is already familiar with. The material outperformed the controls displaying higher conversion, lower volumetric shrinkage, and 80% lower shrinkage stress in addition to "superior results in toughness and percent elongation," they reported.

Duff and his team suggest two means of harnessing the potential of the resins: They could be used neat, as a liner material, where their high elongation and toughness will help prevent cracking and caries formation; and they could be used as functional additives to improve the physical properties of existing formulations.

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