Young permanentincisor 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.