首先通过X光片确定根尖终点的位置，主牙胶尖在根管内达到这个长度，并在根尖区应当有“紧缩感”（tugback），使主牙胶尖与根管尽可能密贴，然后切除牙胶尖端0.5-1.0毫米。对于初学者而言，通常切除的太多了。
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自我因迷失的恐惧，紧缩感而呈现；
Ego arises from the fear and obsession of the delusory mind.
有时还发生食道异物感、紧缩感或吞咽困难等自觉症状。
Sometimes happen esophageal foreign body sensation, a sense of austerity or subjective symptoms such as difficulty swallowing.
人们感到钱袋紧缩，对未来缺少安全感。
People feel pinched in their pocketbooks and insecure about their futures.
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