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磨牙牙冠缺损,经X线检查,根尖周组织无炎症和肉芽肿,牙槽突萎缩未超过根长的1/2,在进行根管治疗以后可用能拆开的铸造桩冠修复。它包括带桩的金属核和带桩的金属冠两部分(见图)。金属核(1)靠次要根管固位,金属冠(2)靠主要根管和金属核固位。上磨牙,用腭根管周定金属冠桩钉,用近颊根管固定金属核桩钉。下磨牙,用远中根管固定金属冠桩钉,用近颊或近舌根管固定金属核桩钉。根管扩大到根长的1/2至1/2,用塑料制作金属桩核模
Molar crown defect, by X-ray examination, periapical tissue inflammation and granuloma, alveolar atrophy did not exceed the root length of 1/2, after the root canal treatment can be used to open the casting pile crown repair. It consists of a metal core with a stake and a metal crown with a stake (see picture). The metal core (1) is retained by the secondary root canal and the metal crown (2) is retained by the primary root canal and the metal core. On the molar, with palatal root canal week set metal crown nail, with the buccal canal fixed metal nuclear pile nail. The lower molars, with the distal root canal fixed metal crown nail, near the buccal or proximal canal fixed metal nuclear pile nail. Root canal expansion to the root length of 1/2 to 1/2, made of plastic metal core model