Objective:To appraise the obturation capability of bonded vertically fractured posterior tooth using 3 different detin adhesive by microleakage tests and scan electron microscopy(SEM) observation.

通过染料验和扫描电镜观察对三种本质粘结剂粘结离体纵折后进行微漏测试，评价封闭性能。

The relapse of orthodontically rotated teeth can be a serious problem in occlusal stability after orth-odontic treatment.

扭转的复发是正畸临床治疗后稳定性的难题之一。

To measure the palatal vault in buccal area,which may be helpful to make preadjustment of palatal bar.

研究正畸病人后弓形态的规律,为临床预成杠的制作提供理论基础。