Clinical significance of the histomorphometric evaluation of diabetic microangiopathy in the oral mucosa.

Several structural parameters of the capillary vessels were measured in the oral mucosa of patients with diabetes mellitus of type 1 (D.1) and of type 2 (D.2), and of control cases (C), by means of an image analyser in histological sections of routinely processed biopsies. The studied parameters included: a) capillary wall thickness; b) capillary diameter; c) the ratio of capillary wall thickness and diameter; d) capillary wall area; e) capillary area; f) the ratio of capillary wall area and capillary area; g) density of capillary vessels in the lamina propria; h) density of endothelial cells; i) endothelial nuclear area. Clinical and laboratory parameters were also evaluated (duration of the disease, systolic and diastolic blood pressure levels, glycemia, glycosylated haemoglobin, glycosylated albumin, fructosamines, apolipoproteins A1 and B), in order to assess whether a relationship exists with the morphometric parameters studied. Statistically significant differences, at the level of p less than 0.05, were found in the following morphometric parameters between controls and each group of diabetic patients: mean and standard deviation of capillary wall thickness, mean capillary wall area, mean ratio of the capillary wall area and capillary area. A reduction in the capillary density, i.e. the number of capillary vessels per mm2 of lamina propria, was also observed in diabetic patients with respect to the control group, although it was not statistically significant (C vs. D.1: p less than 0.21; C vs. D.2: p less than 0.10).