Methods : the root canal with root canal orifice burs and helical drilling bits were prepared in advance 方法:采用根管口臺階狀車針與螺旋型根管鉆組合起來擴大根管。
A thickness of over 4mm is the goal ; this can only be achieved by direct application onto the root canal orifices 大于4毫米的暫封材厚度應(yīng)該是個基準;但是這個目標僅僅在暫封材直接封閉到根管口時才能實現(xiàn)。
Objective : to introduce a new prefabricated post - and - core system , a helical drilling bit and a prefabricated post - and - core consisting of a root canal orifice bur which was designed by the author 摘要目的:介紹一種由螺旋型根管鉆、自行設(shè)計的根管口臺階狀車針、預(yù)成樁核組成的預(yù)成樁核系統(tǒng)。