1. Methods Forty-eight maxillary central incisors without defects were divided into four groups randomly after endodonfic therapy and amputation at the midline of labial and medial proximal cement enamel joint perpendicularly to the long axis of the teeth.
选择牙体完整的离体上颌中切牙48颗，截冠后随机分成4组，分别进行铸造不锈钢桩核、铸造不锈钢桩树脂核、铸造纯钛桩核、铸造纯钛桩树脂核恢复桩核部分，最后均行铸造不锈钢全冠修复。
2. Results: 12 cases of maxillary fracture were well demonstrated the location and types of fracture, the relationship of the fracture with the maxillary sinus, alveolar bone, and the dislocation of the temporomandibular joint.
结果：12例颌骨骨折都完整地显示出骨折的部位、类型及与上颌窦、牙槽骨的关系以及颞颌关节脱位情况。