| 英文摘要 |
Transposition is rare and occurred commonly on maxillary canine and premolar. To extract or not to extract, to correct or not to correct the dental transposition teeth, it's a tough decision. A 12-year-old boy was referred for orthodontic correction because of bad alignment at upper dentition. His dental age was in late mixed dentition. Both upper deciduous canines were still retained. Left canine was buccally blocked-out, and first premolar was in palatal crossbite with the lower premolars. Panoramic film showed impacted upper right canine and transposed left canine and first premolar. The treatment duration took 3.5 years. The upper left canine and the first premolar were aligned in correction of tooth position. In addition, the impacted upper right canine was successfully exposed and aligned. The consideration of treatment plan should include factors like positions of the crowns and roots, gingival line, smile esthetics, occlusal interferences and treatment duration. It is important to avoid root interference and root resorption during tooth movement. Bucco-lingual root inclination and soft tissue management should be addressed during correction of the dental transposition. |
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