Abstract: Periodontitis is one of the common oral diseases. Severe periodontitis may lead to tooth loosening，displacement，or even loss，seriously affecting patients′    oral health and quality of life. If severe periodontitis combines with malocclusion，the treatment period will be longer and the process will be more complicated. Multidisciplinary treatment is required for these cases. The treatment goals for these patients are not only to regain periodontal health，but also to restore complete dentition，reconstruct occlusal function，and improve esthetics. This article demonstrates the multidisciplinary treatment for a patient with generalized stage Ⅳ Class C periodontitis combined with anterior crossbite，including initial periodontal therapy，orthodontic treatment，micro crestal flap-alveolar ridge preservation，and dental implant therapy，which has achieved satisfactory results for both the patient and doctors and improved the patient′s oral function and esthetics. This case provides experience for the multidisciplinary treatment of complex clinical situations.

Key words: systemic periodontal therapy, orthodontic treatment, micro crestal flap-alveolar ridge preservation, dental implant therapy

摘要： 牙周炎是常见口腔疾病之一，重度牙周炎可导致牙齿松动、移位甚至丧失，严重影响患者口腔健康与生活质量。若重度牙周炎合并错牙合畸形，则治疗周期更长、治疗过程更复杂，需要口腔多学科联合治疗。对于此类病例的治疗目标不仅局限于恢复牙周健康，还应在此基础上恢复完整牙列、重建咬合功能、改善美观效果。文章展示1例广泛型Ⅳ期C级牙周炎伴前牙反牙合患者的多学科联合诊疗过程，包括牙周基础治疗、正畸治疗、微翻瓣牙槽嵴保存术、种植修复治疗，获得医患双方满意的治疗效果，患者口腔功能和美观均有改善，为此类临床复杂病例的多学科诊疗积累了经验。

关键词: 牙周系统治疗, 正畸治疗, 微翻瓣牙槽嵴保存术, 种植治疗