Abstract: The management of severe periodontitis poses significant challenges owing to the severe damage to the periodontal supportive tissues. The formulation of a therapeutic regimen necessitates comprehensive consideration of tooth extraction strategy，ways of soft and hard tissue augmentation，and prosthetic treatment design. This paper presents a complex case of generalized stage Ⅳ grade C periodontitis accompanied by tooth loss. Through the implementation of initial  periodontal therapy，micro crestal flap-alveolar ridge preservation（MCF-ARP）following extraction，free gingival graft，dental implant restoration，and periodontal maintenance，the therapeutic objectives of regaining health and reconstructing functionality are successfully attained. This case report provides potential scientific insights and a systematic approach for the treatment of such cases of severe periodontitis.

Key words: severe periodontitis, dental implant restoration for patients with periodontitis, alveolar ridge preservation, free gingival graft

摘要： 重度牙周炎患者的治疗因其牙周支持组织破坏严重而极具挑战性，治疗方案的制定需全面考虑拔牙决策、软硬组织增量方法及修复方案等因素。文章报告1例广泛型Ⅳ期C级牙周炎伴牙列缺损的复杂病例，通过实施牙周基础治疗、拔牙同期微翻瓣牙槽嵴保存术、游离龈移植术、种植修复及定期维护，成功达到恢复健康与重建功能的诊治目标，有望为此类重度牙周炎病例的治疗提供科学的思路与系统的方案。

关键词: 重度牙周炎, 牙周炎患者种植治疗, 牙槽嵴保存术, 游离龈移植术