Abstract: Objective: To evaluate the clinical effectiveness of using invisible aligners to remove occlusal trauma caused by pathological displacement in severe chronic periodontitis. Diagnosis and Treatment: A 53-year-old male patient presented with severe chronic periodontitis, scattered spaces among the upper and lower anterior teeth, deep overbite and overjet, molar neutral occlusion, and canine mesial occlusion. The anterior teeth exhibited a 2mm reverse overjet, significant spacing between the upper and lower central incisors, and the midline could not be recorded. The lower anterior teeth showed gradeⅢmobility. Periodontal treatment was performed to control inflammation, and orthodontic treatment with invisible aligners was used to eliminate occlusal trauma. Results: After combined orthodontic-periodontal treatment, occlusal trauma was eliminated, stable occlusion was established, the patient’s profile was improved, and the patient was satisfied with the treatment outcome. Conclusions: Invisible aligners, with their advantages of grouped anchorage and staged movement, facilitate the elimination of occlusal trauma.

Key words: orthodontic treatment, invisible aligners, periodontitis, occlusion trauma, pathologic tooth migration