Epstein D D, Epstein P L, Cohen B I, Pagnillo M K
Columbia University School of Dental and Oral Surgery, New York, NY, USA.
J Prosthet Dent. 1999 Nov;82(5):579-84. doi: 10.1016/s0022-3913(99)70057-0.
There are few research studies concerning prefabricated posts overdenture attachment systems using multiple pull cycles.
This study tested 6 prefabricated post overdenture attachment systems (AccessPost Overdenture, ERA white and ERA grey, Flexi-Overdenture, O-SO and ZAAG) measured to simulate wear over a 2000 pull cycle and compared the in vitro retention, measured (pounds).
Records of the pounds of force necessary to separate each system were made at the beginning of testing, at pull 10 and then at every 50th pull until the 2000th pull was attained. All pulls were performed manually with a Shimpo force gauge. Absolute force (AF) and relative force (RF) were compared, AF being the force required at any pull to separate the overdenture device, whereas RF is the force required at the first pull.
There was considerable difference of the force required at pull 1 for the ERA white, O-SO and ZAAG anchor systems, then the AccessPost overdenture, and finally the Flexi-Overdenture and ERA grey attachment systems.
At pull 2000, there was no statistical difference between any of the attachments studied. The amount of force necessary to offer functional retention to a specific patient wearing an overdenture may vary considerably, depending on the many factors in fabricating the overdenture, and the age, strength, musculature, and the expectations of the patient.
关于使用多次拉伸循环的预制桩覆盖义齿附着系统的研究很少。
本研究测试了6种预制桩覆盖义齿附着系统（AccessPost覆盖义齿、ERA白色和ERA灰色、Flexi-覆盖义齿、O-SO和ZAAG），测量其在2000次拉伸循环中的模拟磨损情况，并比较体外固位力（以磅为单位）。
在测试开始时、第10次拉伸时以及之后每50次拉伸直至达到第2000次拉伸时，记录分离每个系统所需的力的磅数。所有拉伸均使用Shimpo测力计手动进行。比较了绝对力（AF）和相对力（RF），AF是在任何一次拉伸时分离覆盖义齿装置所需的力，而RF是第一次拉伸时所需的力。
ERA白色、O-SO和ZAAG锚固系统在第一次拉伸时所需的力有显著差异，其次是AccessPost覆盖义齿，最后是Flexi-覆盖义齿和ERA灰色附着系统。
在第2000次拉伸时，所研究的任何附着系统之间均无统计学差异。为佩戴覆盖义齿的特定患者提供功能性固位所需的力的大小可能有很大差异，这取决于制作覆盖义齿的许多因素以及患者的年龄、力量、肌肉组织和期望。
