The collation of the data supplied by the arteriography, the pulp biopsy and the "irrigraphy" (method of functional exploration founded on the rheoplethysmography) allows to distinguish three great types of arteriopathy of the diabetic patient:-high form appearing as common arteriosclerosis: occasional arteritis of the diabetics; -distal forms with special irrigraphic profile and great frequency of the microangiopathy; these forms appear very typical of the diabetes and the characteristics identified allow to give them a certain autonomy in the general setting of the arteriosclerosis. It's for these forms that the term of "diabetic arteriopathy" seems really justified; - hyperirrigation syndromes with absence of very important arterial lesion and state of distal hyperirrigation. They seem also very characteristic of diabetes but probably can be considered as beginning forms liable to develop towards a distal form. Next to this hyperirrigation syndrome, a place may be done to a relative hyperirrigation syndrome.