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牙冠严重缺损的后牙,牙髓不可避免受累,要先作根管治疗,然后根据形态和功能要求,进行修复。利用髓室固位修复严重破坏的牙冠,一百多年前就有人提出来了。1869年G.V.Black提倡用金箔充填根管和修复临床牙冠。随着牙髓治疗技术的发展,越来越多的患牙得到保存。根管治疗时作洞形制备和根管预备,要去除部分牙本质,从而减弱了牙齿的强度,加之治疗后无髓牙的牙本质湿度减小,弹性和张力强度降低,易引起牙折。这类牙冠的修复,必须提供垂直向与水平向的支持与因位,才能承受咬合和侧方压力,并防止牙折。修复时可用钉、桩、沟槽
Tooth crown serious defects in the teeth, pulp inevitably involved, we must first for root canal therapy, and then according to the morphological and functional requirements for repair. The use of medullary compartment retention to repair the severely damaged crown was proposed more than a hundred years ago. In 1869 G.V.Black advocated the use of gold foil to fill the root canal and repair the clinical crown. With the development of endodontic techniques, more and more affected teeth are preserved. Root canal treatment for hole preparation and root canal preparation, to remove part of the dentin, thereby weakening the strength of the teeth, combined with no treatment of pulp dentin moisture decreased, elasticity and tensile strength decreased, can cause tooth fractures. The restoration of such crowns, must provide vertical and horizontal support and position, in order to withstand occlusion and lateral pressure, and to prevent tooth folding. Repair available nail, pile, groove