磁性附着体和球帽式附着体固位力的体外疲劳耐久性研究  

Fatigue test of retention force of magnetic attachment and stud-type attachment

作　　者：刘凌宜[1] 姜婷[1] 冯海兰[1] 

机构地区：[1]北京大学口腔医学院修复科,100081

出　　处：《实用口腔医学杂志》2008年第5期635-638,共4页Journal of Practical Stomatology

摘　　要：目的:研究根上附着体在长期使用后固位力的变化。方法:将磁性附着体(Magfit EX-600),半精密球帽式附着体(Bedent)和精密球帽式附着体(Dalbo-classics)各5枚固定在冷热循环疲劳实验机上进行疲劳试验,每摘戴1 000次测量1次固位力,共测量10次。结果:经摘戴10 000次后,磁性附着体由平均初始固位力(3.85±0.107)N,衰减3.38%;半精密球帽式附着体由平均初始固位力(14.10±0.144)N,衰减90.06%;精密球帽式附着体由初始固位力(11.95±0.082)N,衰减74.56%。结论:磁性附着体初始固位力小于另2种附着体,但10年内比较稳定。球帽式附着体初始固位力较大,但衰减也较快。Objective： To study retention force durability of root-type attachments. Methods： Five magnetic attachments （Magfit EX-600）, semi-precise stud-type attachments （Bedent） and precise stud-type attachments （Dalhoclassic） were fixed on a thermal-cycling and mechanical-loading machine respectively. The retention force of each attachment was measured at the baseline and after every 1, 000 cycles of seating-removing. Results ：The average retention force of magnetic attachments was （3.85 ±0. 107） N at the baseline which attenuated for 3.38% after 10, 000 cycles;The retention force of semi-precise group was （ 14.10 ±0. 144） N originally and decreased 90.06% of the original force after 10, 000 cycles. The primary force of the precise group was 33.14 N and was adjusted to （ 11.95 ± 0. 082） N as baseline attenuating for 74.56%. Conclusion ： The retention force of magnetic attachments is lower than the stud attachments hut is stable for 10 years. The retention force of stud-type attachments is larger at the baseline but reduced rapidly.

关 键 词：覆盖义齿 磁性附着体 球帽式附着体 疲劳实验 固位力 

分 类 号：R783.6[医药卫生—口腔医学]