TY JOUR TI Сalcium-phosphorus balance and bone metabolism markers estimation in the combination therapy of patients with chronic generalized severe periodontitis KW periodontitis KW osteogenon KW calcium-phosphorus balance KW ossein KW bone tissue destruction JO Actual problems in dentistry AU Gurtovaya, M.N. AU Kazakova, A.V. PY 2016 IS 12 PB TIRAZH Publishing House