Han Dongwei, Liu Li, Li Qiaoming, Li Binghong
Department of Prosthodontics, Oral College of Tongji University, Shanghai 200072, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2002 Sep;37(5):349-52.
To study the influence of three kinds of retainers on the abutment movement of removable partial dentures (RPDs) for restoring the dentition with unilateral distal-extended tooth missing.
The combined clasp, the extension clasp and the telescopic crown were designed to retain RPDs. When food chip was masticated between dentitions, the displacement of abutments was measured by a high-sensitive-laser-transferring-detector, and then the data was statistically analyzed.
All of abutments showed the inclination, torsion and vertical translocation. Of them, abutments with telescopic crowns had the lowest horizontal torsion (P < 0.01) and the highest vertical translocation (P < 0.01).
Compared with the combined clasp and the extension clasp, the telescopic crowns enable abutments to bear the load more axial and the stress to be distributed more even, so the design of the telescopic crown may be considered more favourable for the health of abutments.
研究三种固位体对单侧远中游离缺失牙列可摘局部义齿（RPD）基牙移动的影响。
设计联合卡环、延伸卡环和套筒冠来固位RPD。当牙列间咀嚼食物碎片时，用高灵敏度激光位移传感器测量基牙的位移，然后对数据进行统计学分析。
所有基牙均出现倾斜、扭转和垂直移位。其中，采用套筒冠的基牙水平扭转最小（P < 0.01），垂直移位最大（P < 0.01）。
与联合卡环和延伸卡环相比，套筒冠能使基牙更轴向地承担负荷，应力分布更均匀，因此套筒冠的设计可能更有利于基牙健康。
