在牙列缺损的固定义齿修复中,有许多辅助固位方法,其中固位钉就是一种非常有效的辅助固位形式。用于牙列缺损修复的固位钉主要是铸造钉,它常与嵌体或高嵌体一起作为固定义齿的固位体,这类修复体可称为固位钉固位金属(牙合)面整铸固定桥。这类修复体的优点是:牙体组织磨除的量少;能保持基牙的生理解剖外形以及天然的邻接点;能满足美观要求;能防止或治疗基牙与邻牙食物嵌塞;对牙周组织无损伤。钱法汤认为利用带固位钉的固位体可修复基牙的大面积缺损或预防基牙折裂。 在利用这种修复体时,为获得足够的固位力,通常要在两端基牙上制备多个针道,而这些针道之间均应相互保持平行以获得共同就位道,这是十分重要的。许多学者认为在进行多针道的牙体制备时必 In dentition defect prosthesis repair, there are many auxiliary retention methods, of which retention pin is a very effective auxiliary retention form. Retention for dentition defect repair nail is mainly cast nail, it often with the inlay or onlays together as a fixed denture retainer, such prosthesis can be called retention pin retention metal (occlusal) Fixed surface casting fixed bridge. The advantages of this type of prosthesis are: small amount of tooth tissue removal; can maintain the anatomy of the abutments anatomical and natural shape of the adjacent points; to meet the aesthetic requirements; to prevent or treat abutment and adjacent teeth food impaction; Periodontal tissue without damage. Money law soup that retainers with retention pins can repair large defects in the abutment or prevent the abutment fracture. In the use of such prostheses, in order to obtain sufficient retention force, it is usually necessary to prepare a plurality of needle tracks on both abutments, all of which should be parallel to each other to obtain a common seating path, which is Very important. Many scholars believe that in the preparation of multi-needle pathways must be