Journal of Dental Research, Vol 73, 1641-1645, Copyright © 1994 by International & American Associations for Dental Research Online Journals
Influence of incorporation of antibacterial monomer on curing behavior of a dental composite
S. Imazato and J. F. McCabe
Department of Oral Biology, Dental School, University of Newcastle upon Tyne, United Kingdom.
A newly developed monomer, methacryloyloxdodecylpyridinium bromide (MDPB),
has an antibacterial activity against oral streptococci, and this monomer
can be active even after being immobilized as one component of a cured
composite. The purpose of this study was to investigate the influence of
incorporation of MDPB on the curing behavior of Bis-GMA-based composites.
Depth of cure, degree of cure, light-attenuating effect, and surface
hardness of composites incorporating 0.4 or 0.5% MDPB were measured and
compared with those of a control material without MDPB. Depth of cure of
composites with MDPB, measured by means of a penetrometer, was greater than
for the control (p < 0.05). Differential thermal analysis showed that
composites with MDPB had a significantly greater degree of cure than the
control (p < 0.05). The light-attenuating effect of MDPB composites was
less than for the control (p < 0.05). No significant difference between
experimental and control was obtained with respect to Vickers hardness
after both one day's and seven days' storage in water. These results
indicate that the incorporation of small quantities of MDPB into
Bis-GMA-based composites did not adversely affect the cure performance. On
the contrary, a significant, though small, improvement was observed.
