正常龈缘位于釉牙骨质界冠方2～3mm。牙龈萎缩原指龈缘降低至釉牙骨质界的根方，使牙根暴露，并引起一系列病症。在严重的牙龈萎缩处当然也发生牙槽骨相应的吸收。几十年来一直将它称为牙周萎缩(periodontal atrophy)，认为是生理性的增龄变化(老年性牙周萎缩...
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