Young permanent incisor injury is common in children. Determination of pulp condition has a great influence on the management and prognosis of injured teeth.

年轻恒前牙外伤是儿童口腔科常见病之一，正确判断牙齿的牙髓状态，对于患牙的处理和预后有很大的影响。

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A case is reported in which two ectopic maxillary permanent canine teeth bypassed the lateral incisors and caused extensive resorption to both maxillary central incisor teeth.

案件报告中，两名常任异位上颌犬齿绕过侧门，并造成了广泛的骨吸收两个上颌中切牙牙齿。

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