As for crown preparation with pin hole retention form, stress distribution on all the three models is almost consistent. Unlike the crown preparation, there is a stress concentration region at the bottom of pin hole crown preparation. 不同深度钉洞固位形全冠预备体模型的应力分布情况基本一致,与全冠预备体模型不同,钉洞底部有应力集中区域。