Turkiye Klinikleri Journal of Dental Sciences

.: ORIGINAL RESEARCH
Evaluation of Some Mechanical Properties of CAD/CAM Polymers (PEEK/PMMA) and Conventional PMMA Materials: An In Vitro Study
CAD/CAM Polimerlerinin (PEEK/PMMA) ve Geleneksel PMMA Materyallerinin Bazı Mekanik Özelliklerinin Değerlendirilmesi: İn Vitro Çalışma
Zeynep ŞAHİNa, Gülfem ERGÜNb, Ayşe Seda ATAOLc, Salih ERGÖÇENd
aDepartment of Prosthodontics, Lokman Hekim University Faculty of Dentistry, Ankara, TURKIYE
bDepartment of Prosthodontics, Gazi University Faculty of Dentistry, Ankara, TURKIYE
cDepartment of Prosthodontics, Ankara Medipol University Faculty of Dentistry, Ankara, TURKIYE
dBiostatistics Specialist, Ankara, TURKIYE
Turkiye Klinikleri J Dental Sci. 2022;28(1):139-48
doi: 10.5336/dentalsci.2021-83103
Article Language: EN
Full Text
ABSTRACT
 Objective: The present study aims to investigate the mechanical properties of base materials [polymethyl methacrylate (PMMA)/polyether ether ketone (PEEK)] fabricated with computeraided design/computer-aided manufacturing (CAD/CAM) and heatpolymerized conventional base materials. Material and Methods: Two different base polymers milled with CAD/CAM (Yamahachi PMMA Disk and Juvora Dental Disk PEEK) and heat-polymerized acrylic resin (Meliodent PMMA) were used in this study. A total of 120 specimens were prepared with 10 specimens in each subgroup of the test materials. Half of the test specimens were stored in distilled water, while the other half were subjected to a thermal cycle. After the thermal cycle, the flexural strength, elasticity module, and, surface hardness of all test specimens was evaluated. The Mann-Whitney U and Kruskal-Wallis tests were used in the analysis of the data. Results: According to the findings of flexural strength and elasticity module of the test specimens, the highest to lowest value ranking was as follows: CAD/CAM PEEK>CAD/CAM PMMA>heat-polymerized PMMA. In the PMMA group produced with CAD/CAM, surface hardness values were significantly higher in the thermocycle applied test specimens compared to those stored in distilled water (p<0.001). Conclusion: CAD/CAM PMMA and PEEK materials were compared with the heat-polymerized test specimens found to show better mechanical properties.

Keywords: Denture bases; computer aided design/computer aided manufacturing; polyether ether ketone; flexural strength; hardness
ÖZET
 Amaç: Bu çalışmanın amacı, bilgisayar destekli tasarım/bilgisayar destekli üretim [computer-aided design/computer-aided manufacturing (CAD/CAM)] ile şekillendirilen kaide materyalleri [polimetil metakrilat (PMMA)/polieter eter keton (PEEK)] ve ısı ile polimerize olan geleneksel kaide materyalinin mekanik özelliklerinin incelenmesidir. Gereç ve Yöntemler: Bu çalışmada, CAD/CAM ile frezelenmiş 2 farklı kaide polimeri (Yamahachi PMMA Disk ve Juvora Dental Disk PEEK) ve ısı ile polimerize olan akrilik rezin (Meliodent PMMA) kullanıldı. Test materyallerinin her bir alt grubunda 10 örnek olmak üzere toplam 120 örnek hazırlandı. Test örneklerinin yarısı distile suda bekletildi. Diğer yarısına ise termal döngü uygulandı. Termal döngüden sonra tüm test örneklerinin bükülme dayanımı, elastikiyet modülü ve yüzey sertliği değerlendirildi. Verilerin analizinde, Mann-Whitney U ve Kruskal-Wallis testleri kullanılmıştır. Bulgular: Test örneklerinin bükülme dayanımı ve elastikiyet modülü bulgularına göre, en yüksek değerden en düşüğe doğru sıralaması CAD/CAM PEEK>CAD/CAM PMMA>ısı ile polimerize PMMA şeklindedir. CAD/CAM ile üretilen PMMA grubu içerisinde, distile suda bekletilen örneklere göre termal döngü uygulanan örneklerde, yüzey sertlik düzeyi istatistiksel anlamlı olarak daha yüksek değerler vermiştir (p<0,001). Sonuç: CAD/CAM ile üretilen PMMA ve PEEK materyalleri, ısı ile polimerize olan test örnekleri ile kıyaslandığında daha iyi mekanik özellikler göstermektedir.

Anahtar Kelimeler: Protez kaideleri; bilgisayar destekli tasarım/bilgisayar destekli imalat; polieter eter keton; bükülme dayanımı; sertlik
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