Etymology
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periodontics (n.)

"the branch of dentistry concerned with the periodontal tissue and its disorders," 1948, from periodontia "periodontal membrane" (1914; see periodontal) + -ics. Periodontic (adj.) is attested by 1889.

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Definitions of periodontics

periodontics (n.)
the branch of dentistry dealing with diseases of the gums and other structures around the teeth;
Synonyms: periodontia
From wordnet.princeton.edu