Medical term for inflammation of the periodontal ligament, the tissue connecting tooth root to bone.
Periodontitis is inflammation of the tissues that support the teeth.
歯周病 is a broader term for periodontal disease, while 歯根膜炎 specifically refers to inflammation of the periodontal ligament.
Compound of 歯根 (tooth root) + 膜 (membrane) + 炎 (inflammation).