A man complains of gingival bleeding that has been persisting for the last 2 years. Objectively he presents with chronic diffuse catarrhal gingivitis, teeth mobility is of the I degree, periodontal pockets are 2-3 mm deep with small amount of serous exudate, occlusion is markedly traumatic. X-ray shows damaged cortical plate, enlarged periodontal ?ssure in the apical areas of the interalveolar septa, osteoporosis, and interalveolar septa resorption by 1/3 of their height. Make the diagnosis: