Treatment options for congenitally missing teeth are controversial, including prosthetic treatment, orthodontic treatment, and long-term observation of remaining deciduous teeth. Long-term observation of remaining deciduous teeth can lead to ankylosis, resulting in infraocclusion, tipping of adjacent teeth, and even maxillary sinus development. When the maxillary sinus develops to the alveolar crest, tooth movement through the maxillary sinus is inevitable, and this can lead to an extended treatment period, root resorption, and tipping tooth movement. The patient was a 14-year-old female with a developed maxillary sinus, hypodontia, supernumerary teeth, an impacted tooth, and transposition of the teeth. Because the patient was young, the ideal treatment goal was to avoid prosthetic treatment. However, because the mandibular left first and second premolars were consecutively absent, we used a setup model to discuss a realistic treatment goal that considers prosthetic treatment in advance. After extraction of the impacted supernumerary tooth, the maxillary first premolars were retracted using a fixed appliance. Bodily tooth movement was achieved by orthodontic tooth movement through the maxillary sinus using a fixed appliance and loop mechanics. Furthermore, all spaces in the congenitally missing teeth were closed, and excellent orthodontic treatment results were achieved without prosthetics.
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