Journal of Dental Research, Vol 73, 511-515, Copyright © 1994 by International & American Associations for Dental Research Online Journals
Quantity of remaining double bonds of diacetyl-containing resins
A. Peutzfeldt
Department of Dental Materials, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Denmark.
The present study determined the effect of diacetyl addition on the
quantity of remaining double bonds of dental resins. Diacetyl was added to
monomer mixtures, which were then made light-curing. The monomer mixtures
were varied with respect to monomer composition and content of diacetyl.
The quantity of remaining double bonds was determined by means of
transmission infrared spectra of the resins recorded before and after wet
or dry storage for one wk. Addition of diacetyl resulted in a decrease in
the quantity of remaining double bonds by as much as 78% as compared with
the mixtures without diacetyl. Negative correlations of statistical
significance were found between content of diacetyl and quantity of
remaining double bonds in BISGMA: TEGDMA-based as well as in UEDMA:
HEMA-based resins for both modes of storage. Significant negative
correlations were found between quantity of remaining double bonds and the
previously determined mechanical properties.
