Abdelrahim Ramy Abdallah, Ezzeldine Ahmed Ali, Abdellah Mahmoud, Elghazawi SaadEldein Sadeq
Faculty of Dentistry, Al-Azhar University, Cairo 11651, Egypt.
Dental College of Dentistry, The Islamic University, Najaf 54001, Iraq.
Dent J (Basel). 2025 Aug 15;13(8):370. doi: 10.3390/dj13080370.
The dental industry is continuously developing high-performance polymer (HPP) materials with different qualities for denture frameworks. The aim of this in vitro study was to assess how thermal ageing (TA) affects the flexural strength (FS) and microhardness of two different HPP materials: Nanoksa G-plus and Bio-HPP/PEEK. The TA process was carried out for 5000 cycles at 5 °C and 55 °C in distilled water. To assess FS, a total of 40 bar-shaped specimens measuring 65.0 mm × 10.0 mm × 2.5 mm (20 per group) were obtained; TA and No-TA (NTA) subgroups were prepared for each material group (10 per subgroup); and a three-point bending test was conducted using an Instron universal testing machine. Each specimen that fractured during the FS test was subjected to microhardness measurement using a Vickers hardness tester. The mean FS and microhardness of the TA and NTA specimens were statistically examined using the -test. Both the TA and NTA Bio-HPP/PEEK specimens exhibited significantly greater ( < 0.0001) microhardness and FS qualities than the Nanoksa G-Plus specimens. The FS and microhardness of the Bio-HPP/PEEK and Nanoksa G-Plus materials significantly decreased ( < 0.05) after TA. The Bio-HPP/PEEK material showed better FS and microhardness properties than the Nanoksa G-Plus material. TA considerably decreased the FS and microhardness of the Bio-HPP/PEEK and Nanoksa G-Plus materials.
牙科行业一直在不断研发具有不同特性的高性能聚合物（HPP）材料用于义齿基托。本体外研究的目的是评估热老化（TA）如何影响两种不同的HPP材料：Nanoksa G-plus和Bio-HPP/PEEK的弯曲强度（FS）和显微硬度。热老化过程在蒸馏水中于5℃和55℃下进行5000个循环。为评估弯曲强度，共制备了40个尺寸为65.0 mm×10.0 mm×2.5 mm的条形试样（每组20个）；为每个材料组制备热老化（TA）和未热老化（NTA）亚组（每个亚组10个）；并使用英斯特朗万能试验机进行三点弯曲试验。在弯曲强度测试中断裂的每个试样都使用维氏硬度计进行显微硬度测量。使用t检验对热老化和未热老化试样的平均弯曲强度和显微硬度进行统计学检验。热老化和未热老化的Bio-HPP/PEEK试样的显微硬度和弯曲强度均显著高于Nanoksa G-Plus试样（P<0.0001）。热老化后，Bio-HPP/PEEK和Nanoksa G-Plus材料的弯曲强度和显微硬度显著降低（P<0.05）。Bio-HPP/PEEK材料的弯曲强度和显微硬度性能优于Nanoksa G-Plus材料。热老化显著降低了Bio-HPP/PEEK和Nanoksa G-Plus材料的弯曲强度和显微硬度。
