Oral cavity examination reveals gingival retraction with exposed roots and cervices of the lower incisors. X ray shows foci of osteoporosis in the alveolar bone; smooth resorption of bone tissue is prevalent. Microscopy of gingival tissues shows sclerosis and hyalinosis of the microvasculature with luminal obliteration. The capillary network is reduced. Connective tissue has dystrophic changes. What pathological process was detected in the patient?