为挽救患牙采取根尖切除术和逆行的汞合金充填是一种保留患牙的好办法。其最常见的适应症:一、先前已做过的根管治疗但未成功者。二、也常常适应于当根管治疗既不可能也不方便的情况时作为主要治疗方法:如器械折断在根管中,钙化根管,弯曲的、畸形的或无法进入的根管,根管穿孔和桩型牙冠修复物等。关于磨牙的根尖周手术有许多文献中提到过,当涉及根尖切除术,一般说适于上、下前牙或双尖牙,而磨牙常列为禁忌症,因 Apical resection and retrograde amalgam filling to save teeth is a good way to preserve the affected teeth. The most common indications: First, the root canal treatment has been previously done but not successful. Second, it is also often used as a primary treatment when root canal therapy is both impossible and inconvenient: instruments broken in the root canal, calcified root canal, tortuous, malformed or inaccessible root canal, root canal Perforated and pile crown restoration and so on. There are many references to the periapical periodontal surgery of molars. When it involves apical resection, it is generally suitable for upper and lower anterior teeth or bicuspid teeth, and molars are often contraindicated because