しゅうりょうがく 歯周治療学
1. periodontics
Wikipedia definition
2. PeriodontologyPeriodontology or Periodontics (from Greek περί peri "around"; and ὀδούς odous "tooth", genitive ὀδόντος odontos) is the specialty of dentistry that studies supporting structures of teeth, diseases, and conditions that affect them. The supporting tissues are known as the periodontium, which includes the gingiva (gums), alveolar bone, cementum, and the periodontal ligament. A professional who practices this speciality field of dentistry is known as a periodontist.
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