the branch of dentistry dealing with diseases of the gums and other structures around the teeth
同义词：periodontia
periodontics详细解释
per.i.o.don.tics n.(used with a sing. verb)（名词）（与单数动词连用）The branch of dentistry that deals with the study and treatment of periodontal disease.牙周病学：牙科的分支，主要研究牙周疾病的治疗 【引伸】 per.iodon.tic 或 per.iodon.tical adj.（形容词）per.iodon.tist n.（名词）
