Abstract:

Objective To investigate the changes in bone mass in the edentulous and newly formed edentulous areas before and after switching orthodontic implantation sites in patients with congenital mandibular anterior teeth loss. Methods Fifteen patients with congenital loss of mandibular anterior teeth were selected for full mouth orthodontic treatment using MBT straight wire appliance. The mandibular lateral incisors were moved to the position of the missing central incisors, and CBCT was taken before and after treatment. The bone mass of the alveolar bone in the missing tooth area and the newly formed missing tooth area was measured. Results Compared with before treatment, the available alveolar bone width in the edentulous area increased at the level of the alveolar ridge crest and 2 mm, 4 mm, and 6 mm below the alveolar ridge. There was no significant change in the height and width of the alveolar bone in the newly formed edentulous area, and the length of the tooth root was slightly absorbed. Conclusion Based on CBCT evidence, this study preliminarily explored the changes in bone mass in the edentulous area after switching orthodontic implant sites in the mandibular anterior region. Orthodontic treatment can effectively increase the bone mass in the edentulous area, confirming the clinical feasibility of switching orthodontic implant sites in the mandibular anterior region.

Key words: congenital absence of mandibular incisors, orthodontic implant site switching, bone mass in edentulous areas, cone beam CT