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根管治疗是治疗不可逆性牙髓炎、牙髓坏死和各种根尖周炎的保存牙齿的方法。根管预备是根管治疗术中重要步骤之一。清理根管是该术成败的关键性环节。清理扩大根管有机械和化学两种方法,而每种方法又有其各自不同的分类。本文就机械制备法中的逐步后退法谈一点体会。逐步后退法又称根管内台阶预备法。是由Schilder(1974)倡导发明的。即使用的根管器械逐号进行,而每用大一号器械时,预备的长度比前一号器械预备的短
Root canal therapy is a method of preserving teeth for irreversible pulpitis, pulp necrosis and various apical periodontitis. Root canal preparation is one of the most important steps in root canal therapy. Cleaning the root canal is the key to success or failure of the procedure. There are two mechanical and chemical methods of cleaning and expanding the root canal, and each method has its own different classification. This article on the mechanical preparation method gradually retreat talk about experience. Gradual retreat method, also known as root canal preparation method. Was invented by Schilder (1974). That is, the endodontic instruments that are used are numbered one by one, and each one with a larger one is shorter than the one prepared by the previous one