In vitro comparison between some mechanical properties of CAD/CAM polyetheretherketone and conventional cobalt chromium frameworks in removable partial denture

Sayed Muhammad, M. Masoud, O. Baraka
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Abstract

Objective: To evaluate the fitting, flexure strength and clasp retentive force and deformation of RPD frameworks made from cobalt chromium and polyetheretherketone. Materials and Methods: Mandibular cast with a unilateral bounded saddle was fabricated, scaned and transferred to Exocad software. Twenty frameworks were fabricated and divided into two groups, group I for PEEK fabricated by CAD/CAM milling technique and group II for Co-Cr fabricated by conventional lost wax technique from 3-D printed resin pattern. Framework fitness was evaluated by replica technique and weighing by a digital analytical balance. Retention was measured by applying withdrawal force to frameworks by a universal testing machine. Deformation of clasps was evaluated by measuring the distance between 2 reference points on the tips of the retentive and reciprocal arms before and after repeated insertion/removal cycles by a chewing simulator. Biaxial flexure strength was determined using a piston-on-3points technique. Results: PEEK material group showed more adaptation than metal. For retention and deformation, metal group recorded higher retention mean value than PEEK but due to the higher deformation in metal there was no significant difference in retention after one year of use simulation. Metal group recorded higher flexure strength than PEEK. Conclusions: Within the limitations of this study, it could be concluded that milled PEEK frameworks have better tissue surface adaptation, totally acceptable retention forces reaches between 9 and 12N, and flexure strength between 137 and 144MPa. which is valid for clinical use.
CAD/CAM聚醚醚酮与常规钴铬支架在可摘局部义齿中力学性能的体外比较
目的:评价钴铬与聚醚醚酮复合材料RPD框架的配合、屈曲强度、卡环固位力及变形情况。材料和方法:制作单侧有界鞍的下颌铸型,扫描并转移到Exocad软件中。制作了20个框架,并分为两组,第一组是通过CAD/CAM铣削技术制造的PEEK,第二组是通过3d打印树脂图案用传统的失蜡技术制造的Co-Cr。通过复制技术评估框架的适应性,并通过数字分析天平进行称重。通过通用测试机对框架施加退出力来测量保留。通过咀嚼模拟器在重复插入/取出循环前后测量固位臂和互惠臂尖端2个参考点之间的距离来评估卡环的变形。双轴抗弯强度采用活塞-3点技术测定。结果:PEEK材料组表现出比金属组更强的适应性。在固位和变形方面,金属组的固位平均值高于PEEK,但由于金属组的变形较高,使用模拟一年后的固位没有显著差异。金属组的弯曲强度高于PEEK。结论:在本研究范围内,铣削后的PEEK框架具有较好的组织表面适应性,完全可接受的固位力在9 ~ 12N之间,抗弯强度在137 ~ 144MPa之间。这是有效的临床使用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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