目的：了解磁性附着体基牙龈下微生物组成与正常龈下微生物组成比的差异及卫生指导前后基牙龈下微生物数量及组成的改变。
Objective: to study the changes of microflora in subgingival groove of abutment in patients with magnetic attachments after oral hygienic instruction and with normal persons.
结论水激光在美容区牙冠延长术中能较快获得龈缘的稳定性以及正常的牙周附着。
Conclusions Waterlase can achieve stability of gingival margin and gain normal periodontal attachment faster in crown lengthening surgery in aesthetic area.
结果：16例上颌埋伏阻生前牙均顺利萌出至正常位置，牙髓活力测试正常。未见龈退缩、邻牙牙根吸收和支抗丧失等常见并发症。
Results: All impacted anterior maxillary teeth of the 16 cases were successfully moved into alignment with pulpal vitality , and no postoperative complications were found.
结果：16例上颌埋伏阻生前牙均顺利萌出至正常位置，牙髓活力测试正常。未见龈退缩、邻牙牙根吸收和支抗丧失等常见并发症。
Results: All impacted anterior maxillary teeth of the 16 cases were successfully moved into alignment with pulpal vitality , and no postoperative complications were found.
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