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【多选题】
关于翻瓣术中龈瓣复位水平，叙述正确的有（）A.
前牙区中等深度牙袋且不需要作骨修整时，为了避免术后牙根暴露，可采用改良Widman翻瓣术，将龈瓣复位于牙颈部
B.
后牙消除中等深度及深牙袋以及需修整骨缺损者，可采用嵴顶原位复位瓣术，龈瓣复位后位槽嵴顶处的根面上
C.
牙袋底超过膜龈联合界者，以及因根分叉病变需暴露根分叉而角化龈过窄者，可采用根向复位瓣术，既消除牙袋也保留角化龈
D.
为了使附着龈增宽，可进行半厚瓣的根向复位，将骨膜和部分结缔组织留在骨面，将半厚瓣复位在牙槽嵴的根方
E.
上颌腭侧也可以进行根向复位瓣术
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