目的观察ＳＪ－１型插销式附着体用于牙列末端游离缺损修复时，基牙数目的增减对支持组织应力分布的影响。方法采用有限元分析法。结果基牙数由３个减为２个，支持组织应力无明显增加。而由２个减为１个，支持组织应力明显增加，是前者的９倍。结论提示临床应用该类修复方法时，一侧牙弓至少采用两单位联合基牙为适。 Objective To observe the influence of the increase and decrease of the number of abutments on the stress distribution in the supporting tissues when the SJ-1 bolt-type attachment is used to repair free dentition defect. Methods using finite element analysis. Results The number of base teeth reduced from 3 to 2, no significant increase in stress on the supportive tissues. From two to one, the support organization significantly increased stress, which is nine times that of the former. Conclusions suggest that clinical application of this type of repair method, the side of the dental arch at least two units with the abutment as appropriate.