固定桥通常用全冠作固位器,基牙预备时切磨牙齿硬组织较多,特别是基牙倾斜或牙槽骨吸收牙根裸露时,不去髓往往不能达到完全合乎全冠要求的基牙制备,致使全冠龈缘和牙颈部不密合。此外,基牙倾斜时固定桥就位和固定比较困难。这类病例适用半冠作固定桥的固位器,但半冠的龈缘放置在外形高点处,也 Fixed bridge is usually used as a crown for retainers, incisors prepared when cutting the tooth hard tissue, especially when the abutment tilt or alveolar bone root resorption, not to the pulp can not be fully meet the requirements of full crown Tooth preparation, resulting in the crown of the gingival margin and dental neck is not close. In addition, when the abutment tilt fixed bridge in place and fixed more difficult. This type of case applies to a semi-permanent bridge retainer, but the gingival margin of the crown is placed at the height of the contour and also