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上颌中切牙之間爲什麽會出現間隙？怎樣矯正？

Posted By vickong pun     July 14, 2021    

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上颌中切牙之間爲什麽會出現間隙？怎 樣矯正？

　　上颌中切牙之間爲什麽會出現間隙？怎 樣矯正？替牙期在恒尖牙沒有萌岀前.不少兒童的上中切牙間會出現 2毫米（mm）以下的間隙，這是因爲恒尖牙牙冠位于側切牙牙根的 遠中，使側切牙和中切牙的牙根向近中傾斜，而牙冠向遠中傾斜， 這種情況造成的中切牙牙間間隙會因爲恒尖牙萌出而自行關閉， 無需治療。但是要拍攝全口曲面斷層片，檢査在中切牙間是否有 多生牙，如果X線片檢査有多生牙，則應盡早拔除。中切牙之間 的唇系帶粗大或附著過低也會造成中切牙間間隙?這時需要正 時，先關閉間隙，再進行脣系帶的修整術。這樣可以防止唇系帶修 整術後造成的瘢痕組織影響間隙的關閉。如果中切牙間間隙大于2毫米，一般不會自行關閉，而口過大 的間隙會占用上颌前部有效的間隙，影響恒尖牙的萌出，因此需要 正畸來關閉間隙。

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