国人牙直丝托槽定位值的测量研究

STUDY OF BRACKET PLACEMENT WITH THE PREAJUSTED APPLIANCE FOR CHINESE

为建立适合国人牙直丝托槽定位值，选择符合Ａｎｄｒｅｗ ｓ 正常牙合成年人６０ 例，男女各３０ 例，１８～２１ 岁，平均１９．２ 岁，均具有协调的面部比例，未接受正畸治疗。弓丝平面定义为大多数牙临床牙冠中点所在的平面，用游标卡尺测量每一牙齿切缘（或牙合缘），至弓丝平面的距离，为直丝托槽应就位的位置。结果显示，托槽并非全部位于每个牙的临床牙冠中点，在上颌双尖牙区，托槽位于临床牙冠中点龈方０．５ｍ ｍ 处，第二磨牙托槽位于临床牙冠中点偏牙合方０．５ｍ ｍ ～１．０ｍ ｍ 处，在下颌尖牙及第一、二磨牙处，托槽位于临床牙冠中点偏牙合方０．５ｍ ｍ 处。表明本研究建立的托槽定位值适合于国人。

In order to determine bracket placement with the preajusted appliance for Chinese. Sixty Chinese adult normal occlusion was chosed as Andrews stated. The plane of arch wire was defined as plane of clinical crown center in most teeth. The measurements from the incisal or occlusal edges to the plane of arch wire was bracket placemrnt. The result showed that the aligned brackets were not located in the centers of the clinical crowns of all teeth. In the upper arch, the bracket heights of the bicuspids were consistently 0.5 greater and those of the second molars were 0.5 1mm less. In the lower arch, the bracket heights of the cuspids and molars were consistenly 0.5mm less. The bracket placement chart improves the accuracy of bracket placement with the preajusted appliance.