Abstract: Objective: This paper reports the multidisciplinary treatment process of periodontal-orthodontic-restoration in a patient with Class I malocclusion with gingival recession of lower anterior teeth and explores its clinical effect. Diagnosis and treatment: The patient was affected by the gingival recession of the lower anterior teeth, the scattered space, and the malocclusion, which affected the aesthetic treatment. After the diagnosis and the patient's informed consent, the basic periodontal treatment was used to control the periodontal inflammation. Free gingival graft (FGG) was used to treat gingival recession, and periodontal accelerated orthodontic osteogenesis (PAOO) was used to improve the bone mass of hard tissue. Finally, orthodontic treatment was used to close the gap and adjust the occlusion and was combined with restorative treatment to restore the missing teeth. Results: After treatment, the gingival recession was significantly improved, the width of keratinized gingiva was increased, the orthodontic tooth movement was completed safely, the malocclusion was corrected, and the missing tooth function and aesthetic reconstruction were completed. The periodontal condition was good throughout the treatment, and the gingival margin of the lower anterior teeth was stable. After 2 years of follow-up, the occlusal relationship and soft tissue morphology were maintained well, and the patient satisfaction was high. Conclusions: The support of periodontal soft and hard tissue reconstruction through regenerative techniques such as FGG and PAOO, and the progressive movement strategy can control the risk of increased gingival recession.

Key words: periodontal-orthodontic-prosthodontics combined treatment, malocclusion, gingival recession, periodontitis, multidisciplinary combined treatment