The suction method was used to test the capillary resistance of oral mucous membranes. The labial mucosa was found to be suited to capillary resistance studies since it lacks both pigment and cornification, and the petechial hemorrhages are easily visualized. The minute vessels of the lower labial mucosa were significantly stronger at -50, -100, -200, -300 and -400 mm Hg than were those of the skin of the antecubital fossae. It is now possible to recognize subjects of high, low, and intermediate capillary resistance.
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