The aim of this study was to test a possible dose-response effect of topical application of
delmopinol HCl on the salivary microbiology, the healing of a pre-established experimental
gingivitis, plaque development, and supragingival plaque composition. Forty-eight healthy subjects were enrolled in an
oral hygiene program for 2 wk to upgrade their oral health. After professional tooth cleaning, they abstained from all
oral hygiene, but applied 2 ml of a placebo with a soft paintbrush onto their teeth twice daily for 2 wk. At the end of this period, the subjects received tooth cleaning and were then assigned to three treatment groups of 16 individuals each. They applied 2 ml of 0.1%, 0.5%, and 1%
delmopinol HCl, respectively, twice daily for the next 2 wk and refrained from all other
oral hygiene procedures. At the end of the placebo and
delmopinol HCl treatment periods, (1) saliva samples were obtained and cultivated on a series of media, (2) the degree of
gingivitis was measured with gingival crevicular fluid (GCF) and
gingivitis index (GI), (3) the stainable buccal plaque extension was analyzed planimetrically, and (4) the bacterial morphotypes of plaque adjacent to the gingival margin were analyzed. No changes in the salivary microbiologic counts were detected. The amounts of GCF and GI were reduced in all
delmopinol groups, as compared with placebo. Mean plaque extension was reduced by 16% for the 0.1%, 56% for the 0.5%, and 58% for the 1%
delmopinol group. Cocci appeared to predominate in bacterial
dental plaque when 0.5% and 1%
delmopinol were used.(ABSTRACT TRUNCATED AT 250 WORDS)