Prevalence of diabetes mellitus in odontogenic infections and oral candidiasis: an analysis of neutrophil suppression.

The prevalence of diabetes mellitus (DM) in odontogenic infections and oral candidiasis was examined, and influences of DM on the clinical manifestations of the infections and neutrophil functions were investigated. Among 21 severe and 221 mild odontogenic infections, DM was detected in 5 cases in each group. Of 64 cases of symptomatic oral candidiasis, 8 cases were complicated with DM which was detected by blood examination during treatment. During the period of infection, the mean fasting blood sugar level was 16.0 +/- 4.4 and 9.8 +/- 1.2 mmol/l in the DM-complicated odontogenic infections and candidiasis, respectively. All white blood counts, C-reactive protein levels and erythrocyte sedimentation rates were more elevated in DM(+) odontogenic infection cases than in DM(-) ones. In DM(+) candidiasis, hyposalivation (0.79 +/- 0.54 ml/10 min) was observed. The polymorphonuclear leukocytes from diabetic patients, especially those with candidiasis, produced less free oxygen radicals and exhibited reduced phagocytosis and intracellular killing of Candida cells associated with this reduced O2- generation during the infection. These suppressed neutrophil functions increased after treatment but did not reach control levels. These results indicate that DM is a predisposing condition for odontogenic infections and oral candidiasis, that DM-complicated infections become severe because of neutrophil suppression, and that examination of blood sugar level should be essential for patients with oral infections.