首页|不同设计的聚醚醚酮卡环固位及疲劳性能研究

不同设计的聚醚醚酮卡环固位及疲劳性能研究

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目的 增加聚醚醚酮(PEEK)卡环臂进入倒凹的比例,并探究这一改变对PEEK卡环固位力和疲劳性能的影响,提出并验证一种可以提高PEEK卡环性能的设计方式.方法 设计并加工 3 组PEEK三臂卡环(n=10/组),分别令其固位臂的末端 1/3、末端 2/3 以及全部固位臂进入 0.75 mm深度的倒凹;一组钴铬合金卡环(n=10),令其固位臂末端 1/3 进入 0.25 mm深度的倒凹作为对照组.在对卡环进行初始固位力测量后,在体外进行 15 000 次摘戴的疲劳循环,每经过 1 500 次循环再测量一次卡环的固位力.使用光学扫描与软件偏差分析,通过均方根(RMS)比较疲劳前后卡环的形变量.使用扫描电子显微镜观察疲劳前后卡环臂内表面的变化.结果 固位臂全进入倒凹区的PEEK卡环平均固位力(9.24±1.78)N,在 3 组PEEK卡环中最高;但仍略低于钴铬合金卡环(11.88±2.05)N.经过疲劳循环,各组卡环的固位力均发生了下降,其中钴铬合金卡环固位力的下降率最高(38.38%).三组PEEK卡环的RMS没有统计学差异(P=0.111),且都低于钴铬合金卡环的RMS(105.47±10.82)μm.在扫描电子显微镜成像下,所有组卡环臂内表面都观察到了磨损的痕迹,并且主要发生在卡环臂进入倒凹的部分.结论 增加PEEK卡环固位臂进入倒凹的比例能够有效提高卡环的固位力,并且在经过体外疲劳循环后,具有优于钴铬合金卡环的固位力稳定性,可以满足临床要求.初步验证了通过增加PEEK卡环臂进入倒凹的比例来提高卡环性能的可行性.
Investigation on the retentive force and fatigue property of different designed polyetheretherketone clasps
Objective By investigating the retention and fatigue performance of polyetheretherketone(PEEK)clasps with increased proportions of clasp arm engaging the undercut,an innovative method to improve PEEK clasps'performance was proposed and verified.Methods Three groups of PEEK clasps(n=10/group)with the terminal 1/3,2/3 and whole of their retentive arms engaging the 0.75 mm undercut were designed and fabricated respectively along with a group of cobalt-chrome clasps(n=10)with their terminal 1/3 of retentive arms engaging the 0.25 mm undercut.Retentive forces were recorded initially and every 1 500 cycles for a total of 15 000 in-sertion and removal fatigue cycles.Optical scanning and software analysis were applied to evaluate the deformation of the clasps by root mean square(RMS)after fatigue test.The inner surface morphology of clasps'arms was observed by scanning electron microscopy.Re-sults PEEK clasps with the whole of their retentive arms engaging the undercut exhibited highest mean retentive force(9.24±1.78)Namong other PEKK clasps,which was slightly lower than that of cobalt-chrome clasps(11.88±2.05)N.The retentive force of each group turned out to be reduced after fatigue cycles and cobalt-chrome clasps showed the greatest reduction(38.38%).The RMS of the PEEK clasps groups were of no statistical difference(P=0.111)and were lower than that of cobalt-chrome clasps(105.47±10.82)μm.Evidence of surface abrasion was observed on all groups of clasps especially on the section that engaged the undercut.Conclusion Increasing the proportion of PEEK clasp arm engaging the undercut effectively improved the retentive force and satisfied clinical re-quirements after fatigue cycles.PEEK clasps exhibited greater retention stability than cobalt-chrome clasps.It is feasible to improve the performance of PEEK clasps by increasing the proportion of clasp arm engaging the undercut.

polyetheretherketoneclaspretentive forcefatigueundercut

罗颐辰、邱琳、耿铭珠、张玮

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南京医科大学附属口腔医院口腔特诊科,江苏南京(210029)

南京医科大学口腔疾病研究江苏省重点实验室,江苏南京(210029)

江苏省口腔转化医学工程研究中心,江苏南京(210029)

聚醚醚酮 卡环 固位力 疲劳性能 倒凹

南京市卫生科技发展专项

YKK23294

2024

口腔医学
南京医科大学口腔医学院

口腔医学

CSTPCD
影响因子:0.641
ISSN:1003-9872
年,卷(期):2024.44(5)
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