4.Results
Six months after exposure, the bracket of 34 was aligned into the dental arch (Figure 10), and 34 had normal pulp vitality, without abnormal looseness. His parents were satisfied with the treatment outcome at this stage. Due to the academic reasons of their child, they did not consider stage II orthodontic comprehensive treatment for the time being, and requested the removal of the fixed appliance from the lower half of the mouth, thereby ending treatment at this stage and transitioning to the passive maintenance stage. A panoramic radiograph was taken before removing the fixed appliance, and it showed that the 34 had curved roots, without obvious abnormality in the bone mineral density at the apical area (Figure 11).