Abstract: Objective: To evaluate the clinical effect of erbium laser in the treatment of periodontal vertical absorption zone. Methods: One week after basic periodontal therapy, Er-YAG was used to assist the treatment. Results: After the treatment, the periodontal condition was significantly improved, and the periodontal bone defect in the vertical direction was regenerated obviously. Conclusion: Er-YAG laser treatment can effectively control periodontal inflammation and promote the regeneration of periodontal bone defect.

Key words: Er-YAG laser, Periodontal disease, Vertical bone defect, Periodontal bone regeneration