牙周炎是一类以牙槽骨吸收为主要特征的感染性疾病，但其病因理论中的许多具体机制尚未明了。
Periodontitis is an infectious diseases and the key feature is bone resorption, but the exact mechanism of etiology is unclear.
牙周炎是危害人类健康的重要疾病之一，是造成失牙的最主要原因之一，牙槽骨吸收是其主要病理改变。
Periodontal disease, seriously damaging human health, is the main reason for lost teeth. Alveolar bone resorption is the major pathological change.
牙周炎是危害人类健康的重要疾病之一，是造成失牙的最主要原因之一，牙槽骨吸收是其主要病理改变。
Periodontal disease, seriously damaging human health, is the main reason for lost teeth. Alveolar bone resorption is the major pathological change.
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