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龋洞较大、经过银汞充填或髓病治疗的死髓牙,特别容易劈裂而形成残冠。这种残冠不能进行充填或嵌体修复,故一般均列为拔牙适应症。为了尽可能保存功能牙齿,对这类门诊较为常见的残冠,我们采用金属全冠修复。若牙冠缺损少于1/2,可直接用全冠修复。若牙冠缺损超过1/2(或仅剩1/4～1/5),可用桩钉加金属全冠修复。我们通过46例临床实践,获得满意疗效。1.制冠前准备:患牙有根尖病变者,应先治愈;牙髓
Larger cavities, after the amalgam filling or myeloid marrow treatment of dead teeth, particularly easy to split and the formation of residual crown. This canopy crown can not be filled or inlay, it is generally classified as tooth extraction indications. In order to preserve the function of teeth as much as possible, the more common residual crown of such clinics, we use metal crown repair. If the crown defect less than 1/2, can be used directly crown repair. If the crown more than 1/2 of defects (or only 1/4 to 1/5), can be used to nail and metal crown repair. We passed 46 clinical practice, access to satisfactory results. 1. Preparation of crown system: root tip lesions in patients with teeth, should be cured first; pulp