结果重庆市正常青少年的临床牙冠中心高度与国内外的相关资料测量结果不同。
Results The center height of clinical crowns were different according to different area and race.
其最大特点是既反映大多数牙的临床牙冠中点，又对某些牙位托槽位置进行了调整，实现了无弓丝弯曲的直丝弓矫治目的。
The placement of the incisor teeth bracket was in the middle of the clinical crown, and retention arch wire was straight wire without step bends.
目的：对30例下颌第三磨牙冠周炎盲袋内的内容物行细菌学研究，希望能筛选出临床治疗冠周炎的敏感药物。
Aim: To find out the sensitive drugs after studying the contents of the pockets of 30 lower third molar pericoronitis.
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