Correction of Bimaxillary Protrusion with Four First Premolar Extractions and T-Loop Mechanics: A Case Report

Abstract

Bimaxillary protrusion is a condition characterized by proclined upper and lower incisors with an increased
prominence of the lips. This is a case of a 18-year-old with bimaxillary protrusion, mild crowding on the maxilla
and mandible, and mandibular dental midline shift to the left by 1 mm. The four first premolars were extracted
using a pre-adjusted bracket. This bracket had in-built prescriptions of torque, tip, and in-out for orthodontic cases. There were three pre-adjusted orthodontic bracket systems: Andrews, Roth, and MBT. T-loop was also used to achieve controlled space closure. After 26 months of orthodontic treatment, the patient’s profile was straighter and a pleasant smile was achieved at the end of treatment.