Zhang Wei, Zhang Xian-fang, Han Dong-wei
Department of Prosthodontics, College of Stomatology, Tongji University, Shanghai 200072, China.
Shanghai Kou Qiang Yi Xue. 2006 Apr;15(2):198-201.
To study the influence on the abutment movement with three kinds of precision attachments designed for distal-extension removable partial dentures (RPDs).
Snap attachment, Ceka attachment, Mini-SG attachment were used to retain RPDs. Then food chip was masticated between the upper and lower dentitions on the attachments side. Placement of abutment was measured by LB-72 high-sensitive-laser-traneferring-detector and the data were statistically analyzed for random block analysis of variance.
The displacement, inclination, and torsion of the abutment movements in the mesial-distal, bucco-lingual and occluso-gingival directions all had statistical significance (P<0.05). The largest mesial-distal inclination occurred with the Mini-SG attachment. The Ceka attachment produced more abutment displacement in mesial distal and apical directions. Occlusal displacement and anti-clockwise rotation were the least with the Snap attachment.
The most equitable distribution of stresses on the supporting structures was achieved by Snap attachment with its resilent assemble, Ceka attachment transfers most of the loading forces to the abutments, Mini-SG attachment can not reduce the excessive torque applied to the abutments effectively.
研究三种为远中游离端可摘局部义齿（RPD）设计的精密附着体对基牙移动的影响。
采用按扣式附着体、Ceka附着体、Mini-SG附着体来固位RPD。然后在附着体侧的上下牙列间咀嚼食物碎屑。用LB-72高灵敏度激光转移探测器测量基牙的位移，并对数据进行随机区组方差分析的统计学分析。
基牙在近远中、颊舌向和咬合龈向移动的位移、倾斜和扭转均具有统计学意义（P<0.05）。Mini-SG附着体产生的近远中倾斜最大。Ceka附着体在近远中和根尖方向产生的基牙位移更多。按扣式附着体的咬合位移和逆时针旋转最小。
按扣式附着体通过其弹性组件实现了支持结构上应力的最均匀分布，Ceka附着体将大部分加载力传递给基牙，Mini-SG附着体不能有效减少施加于基牙的过大扭矩。
