a)/b)圖分別表示上顎左犬牙與第一小臼齒異位萌出
c)顯示4往遠心顎側走,3往近心頰側走,這就像是兩列火車交會而過一樣,困難度很高(原因是牙齒要避開根露出來,所以拉的速度要很慢,不可心急
d)最後3-4分別到位後要把轉矩再做好
上圖就是一例左上3-4異位萌出的病例
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