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1869年Black开始将桩冠应用于临床。当时是用金箔(gold foll)充填根管,插入一根金螺栓作为义齿的固位。1966年开始使用预成桩和复合树脂核。预成桩的使用为桩冠的制作提供了简单而实用的方法。然而桩冠的成败取决于桩的抗力与固位力。临床上桩冠的失败,常见的是桩缺乏足够的固位力。Kurer认为桩冠是一种固位较差的固定修复体,其固位差的根本原因是桩和根管壁的接触面积小。假若理想的桩长
In 1869, Black started to apply the crown to the clinic. At that time, the root canal was filled with gold foll, and a gold bolt was inserted as a retention of the denture. Pre-formed piles and composite resin cores were used in 1966. The use of precast piles provides a simple and practical way of making the crown. However, the success or failure of the crown depends on the resistance and retention of the pile. Clinically, the failure of pile crown, the common pile is lack of sufficient retention force. Kurer that the crown is a poor retention of the fixed prosthesis, the root cause of poor retention is the contact area of the pile and the root canal wall is small. If the ideal pile length