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覆盖基牙(牙合)面而暴露唇颊面的整铸固定桥,符合美观要求,但为了增强固位须加固位钉,固位钉必须互相平行义齿才能顺利戴入。然而基牙预备时使固位钉孔道互相平行并不容易,所以须先作“钻孔导体”。并且先在模型上作好固定桥,然后在基牙上形成固位钉孔道。 方法步骤 基牙(牙合)面预备后,用不收缩的印模材料取印模,用超硬石膏制模型,根据基牙X线照片牙髓腔的状况,确定避开牙髓的钻孔位置;在模型的基牙上钻孔时,为使各个孔道互相平行,把平行测量尺固定在
The cast-in fixing bridge that covers the abutment face and exposes the labial and buccal face meets aesthetic requirements. However, in order to enhance the retention, the cast-in fixation pin must be parallel to the denture for smooth insertion. However, it is not easy for the abutments to make the pin holes parallel to each other when they are prepared, so a “conductor for drilling” must be made first. And first make a fixed bridge in the model, and then form a fixed nail hole in the abutment. Method Steps After preparation of the abutment surface, the impressions were made with non-contracted impression material and the model of the anhydrite was used to determine the hole to avoid the pulp based on the dental pulp cavity of the abutment Position; drilling holes in the model abutment, in order to make each hole parallel to each other, the parallel measuring scale fixed at