Abstract: Objective: We presented a case of customized fixed lingual orthodontic treatment combined with corticotomy for a 41-year-old female patient with skeletal Class I bimaxillary protrusion, aiming to achieve safe and effective dentoalveolar remodeling and facial profile improvement. Diagnosis and Treatment: After thorough analysis, diagnosis, and informed consent, a treatment plan involving orthodontic extraction of teeth $\begin{array}{l|l}4 & 4 \\\hline 4 & 4\end{array}$ was performed. A customized fixed lingual orthodontic system was used, incorporating a transverse palatal arch and temporary anchorage device. Following alignment and leveling of the dental arches, corticotomy of the upper and lower alveolar bones was performed to retract the anterior teeth, followed by fine adjustments. Results: After 29 months of treatment, the patient’s profile was significantly improved, molar relationships were neutral, and the anterior teeth exhibited normal overbite and overjet. Conclusions: Digital customized fixed lingual orthodontic treatment is suitable for cases of skeletal Class I bimaxillary protrusion malocclusion. By leveraging the advantages of anchorage control and incorporating corticotomy, the treatment achieved an optimal balance of aesthetics and health in orthodontic outcomes..

Key words: customized fixed lingual orthodontic appliance, corticotomy, skeletal class I malocclusion, bimaxillary protrusion, orthodontic treatment with extraction