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periodontics

periodontics, n. pl. (const. as sing.). Dentistry.
  (pɛrɪəˈdɒntɪks)
  [f. as prec.: see -ic 2.]
  The branch of dentistry concerned with periodontal tissue, disorders, etc.

1948 L. I. Grossman Handbk. Dental Pract. v. 83/1 Periodontics is that branch of dentistry which deals with the science and treatment of periodontal disease. 1960 S. Sorrin Pract. of Periodontia i. 1 The practice of periodontics is based on an understanding and recognition of the healthy periodontium. 1969 Bohannan & Saxe in Morris & Bohannan Dental Specialities vii. 260/1 Time devoted to periodontics in the traditional dental educational program has been woefully inadequate. 1975 J. E. Chasteen Essent. Clin. Dental Assisting xi. 200/1 Periodontics is the branch of dentistry that deals with the diagnosis and treatment of diseases which destroy the supporting tissues of the teeth.

Oxford English Dictionary

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