Design of studies or clinical trials to evalute the effectiveness of agents or procedures for the prevention, or treatment, of loss of the periodontium.
D001706:Biopsy; D005069:Evaluation Studies as Topic; D006801:Humans; D009909:Oral Health; D010510:Periodontal Diseases / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology / Q000517:prevention & control*; D010519:Periodontium / Q000473:pathology; D011859:Radiography