Abstract: Objective: This case reports the clinical application of periodontal soft and hard tissue augmentation in the treatment of alveolar bone dehiscence and root surface exposure during orthodontic treatment. Diagnosis and treatment: A 26-year-old male patient suffered gingival recession in his right upper posterior tooth during orthodontic arch expansion, therefore the tooth movement was stopped and periodontal treatment was requested. Clinical examination showed that Miller classⅢ gingival recession in teeth$\underline{7-5}\rvert$. CBCT examination showed that alveolar bone resorption was presented in the coronal third to middle of the roots in teeth$\underline{7-5}\rvert$. After the mucogingival surgery for root coverage and keratinized gingival augmentation, the corticotomy combined with bone graft surgery was completed to treat alveolar bone dehiscence of teeth $\underline{7-5}\rvert$. Results: After 1 year of follow-up, the orthodontic treatment was successfully completed, and the condition of gingiva and alveolar bone was stable. Conclusion: Subepithelial connective tissue graft-based procedures combined with corticotomy+bone graft surgery could provide satisfactory outcomes in the treatment of alveolar bone dehiscence and root surface exposure during orthodontic treatment, however the long-term stability remains to be further explored.

Key words: gingival recession, dehiscence, root coverage, guided tissue regeneration, periodontal, bone augmentation