在牙体上制备出一定的面、洞、沟等几何形态，这种用以保证修复体获得固位力的几何形状称固位形。
目的观察纵槽横沟固位形修复楔状缺损的效果。
ObjectiveTo investigate the effects of securing longitudinal-socket-transverse fissure(LSTF) fixtures on wedge-shaped defect(WSD) rehabilitation.
结论：提高烤瓷粘结桥的修复质量，需严格把握适应症和牙体预备时增加辅助固位形，同时优质粘结剂和酸蚀技术的合理应用也起重要作用。
Conclusions:Satisfac- tory results were attributed to the indication of prosthesis, supplementary retention form in tooth preparing, high-quality bonding agents and performing etching on surface oft.
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