After periodontal invasion and destruction, the dental arch may present attachment loss?furcation involvement?poor crown/ratio and pathological migration. These complicated the clinical situation and treatment. This report shared a perio-prosthetic cases. Data collection include chief complain?history?clinical examination?study cast analysis and radiographic examination. By surveying above data, correction diagnosis was made and proper treatment plan was decided. The treatment plans were executed after agreement of the patients. The periodontal therapy involve nonsurgical periodontal treatment, re-evaluation, periodontal surgery and maintenance. The periodontal surgery include guided tissue regeneration surgery?implant surgery. Gradually, the transitional prosthesis and final prosthesis were made. By interdislplinary treatment, the situation of the complicated remaining periodontal arch will be solved to achieve the result meeting patient requirement and satisfaction.