Vaddamanu Sunil Kumar, Alhamoudi Fahad Hussain, Chaturvedi Saurabh, Alqahtani Nasser M, Addas Mohamed Khaled, Alfarsi Mohammad Al, Vyas Rajesh, Kanji Masroor Ahmed, Zarbah Mohammad A, Alqahtani Waleed M S, Alqahtani Saeed M, Abdelmonem Adel M, Elmahdi Asim Elsir
Department of Dental Technology, College of Applied Medical Sciences, King Khalid University, Abha 61421, Saudi Arabia.
Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha 61421, Saudi Arabia.
Polymers (Basel). 2023 Feb 15;15(4):956. doi: 10.3390/polym15040956.
Polyetheretherketone (PEEK) has provided the option to fabricate RPDs with aesthetics unlike metal RPDs, but little attention has been paid to its suitability, especially towards the retentive forces and deformation of the clasp. This study aimed to examine the retentive forces and the fitting surface (inner surface) deformation of clasps made from PEEK and compare it with cobalt-chromium (Co-Cr) clasp.
Forty-two circumferential clasps (14 Co-Cr and 28 PEEK) were fabricated and divided into two groups with clasp undercuts (0.25 mm and 0.5 mm) with thicknesses of 1 mm and 1.5 mm. Each was examined for retentive forces after cycle test on its abutment for 360 cycles. Initial and final retentive forces were recorded. The fitting surface deformation was determined using 3-Matic research analysis software.
The results revealed that highest mean initial retentive force was of Co-Cr clasps with 0.50 mm undercut 22.26 N (±10.15 N), and the lowest was the 1 mm PEEK clasps with 0.25 mm undercut 3.35 N (±0.72 N) and highest mean final retentive force was the Co-Cr clasps with 0.50 mm undercut 21.40 N (±9.66 N), and the lowest was the 1 mm PEEK clasps with 0.25 mm undercut 2.71 N (±0.47 N). PEEK clasps had a lower retentive force than Co-Cr clasps with 0.50 undercut. PEEK clasps (1.5 mm) at 0.25 mm undercut had the least deformation (35.3 µm). PEEK showed significantly less deformation ( ≤ 0.014) than Co-Cr.
The deformation of PEEK clasps fitting surface was lower than Co-Cr clasps and retentive forces were close to the Co-Cr clasps, suggesting the use of PEEK as an aesthetic clasp option for RPD framework.
聚醚醚酮（PEEK）为制作具有美观性的可摘局部义齿（RPD）提供了不同于金属RPD的选择，但人们对其适用性关注较少，尤其是对卡环的固位力和变形情况。本研究旨在检测由PEEK制成的卡环的固位力和贴合面（内表面）变形情况，并与钴铬（Co-Cr）卡环进行比较。
制作42个环形卡环（14个Co-Cr卡环和28个PEEK卡环），并将其分为两组，卡环倒凹分别为0.25mm和0.5mm，厚度分别为1mm和1.5mm。每个卡环在其基牙上进行360次循环测试后检测固位力。记录初始和最终固位力。使用3-Matic研究分析软件确定贴合面变形情况。
结果显示，平均初始固位力最高的是倒凹为0.50mm的Co-Cr卡环，为22.26N（±10.15N），最低的是厚度为1mm、倒凹为0.25mm的PEEK卡环,为3.35N（±0.72N）；平均最终固位力最高的是倒凹为0.50mm的Co-Cr卡环，为21.40N（±9.66N），最低的是厚度为1mm、倒凹为0.25mm的PEEK卡环，为2.71N（±0.47N）。倒凹为0.50时，PEEK卡环的固位力低于Co-Cr卡环。倒凹为0.25mm时，厚度为1.5mm的PEEK卡环变形最小（35.3µm）。PEEK的变形明显小于Co-Cr（≤0.014）。
PEEK卡环贴合面的变形低于Co-Cr卡环，且固位力接近Co-Cr卡环，这表明PEEK可作为RPD支架的一种美观卡环选择。
