Waghmare Anagha, Nair Chandana, Shukla Anuj K, Chaturvedi Mudita, Bhagat Tushar Vitthalrao, Alsubaiy Ebrahim Fihaid, Suleman Ghazala, Khader Mohasin Abdul, Chaturvedi Saurabh
Department of Prosthodontics and Crown & Bridge, VYWS Dental College and Hospital, Amravati, Maharashtra, India.
Department of Prosthodontics and Crown and Bridge, Institute of Dental Sciences, Bareilly, India.
Heliyon. 2024 Nov 15;10(22):e40442. doi: 10.1016/j.heliyon.2024.e40442. eCollection 2024 Nov 30.
Higher bending forces during chewing and occlusal loading can lead to the deformation of denture bases. Roughness and microbial adhesion can be the result of improper care of the denture. Many attempts have been made to improve the properties of denture bases through the addition of different materials. The present study aimed to evaluate the surface hardness and flexural strength (FS) of newly formulated nanocomposite denture base resin made by adding zinc oxide (ZnO) and titanium dioxide (TiO) nanoparticles in heat polymerized polymethyl methacrylate resin in concentrations of 1 % and 2 %.
Rectangular metal master dies of dimension 65mm × 10mm × 3.3 mm for flexural strength and 30mm × 10mm × 3 mm for surface hardness were made. These dies were duplicated in 120 acrylic resin samples. These samples were divided into five groups in which group I is control group samples in conventional resin and group II,III, IV &V contained 1 % and 2 % concentrations of ZnO & TiO nanoparticles in heat cure acrylic resin. The processing and finishing of the models were done. Flexural strength was measured using a universal testing machine and surface hardness using a Rockwell hardness testing machine.
The minimum SH reported was 101.7 HRM while FS was 81.1 MPa and maximum was 118.7 HRM and 131.8 MPa respectively. The results showed that group IV containing 1 % TiO nanoparticles showed the highest surface hardness values whereas the flexural strength was highest in group II containing 1 % ZnO nanoparticles. The analysis of variance showed a value of <0.001 which was statistically highly significant.
Nanocomposite denture base resins modified with ZnO & TiO nanoparticles have more flexural strength and surface hardness than conventional denture base resin.
The hardness of a denture base material can be increased by adding these nanoparticles for long term use in oral cavity and in cases prone to denture fracture.
咀嚼和咬合加载过程中较高的弯曲力会导致义齿基托变形。义齿护理不当会导致表面粗糙和微生物附着。人们已经进行了许多尝试，通过添加不同材料来改善义齿基托的性能。本研究旨在评估通过在热聚合聚甲基丙烯酸甲酯树脂中添加浓度为1%和2%的氧化锌（ZnO）和二氧化钛（TiO）纳米颗粒制成的新型纳米复合义齿基托树脂的表面硬度和弯曲强度（FS）。
制作尺寸为65mm×10mm×3.3mm用于弯曲强度测试和30mm×10mm×3mm用于表面硬度测试的矩形金属母模。将这些模具复制到120个丙烯酸树脂样品中。这些样品分为五组，其中I组是传统树脂的对照组样品，II、III、IV和V组在热固化丙烯酸树脂中含有1%和2%浓度的ZnO和TiO纳米颗粒。对模型进行加工和修整。使用万能试验机测量弯曲强度，使用洛氏硬度试验机测量表面硬度。
报告的最低表面硬度为101.7 HRM，弯曲强度为81.1MPa，最高分别为118.7 HRM和131.8MPa。结果表明，含有1% TiO纳米颗粒的IV组表面硬度值最高，而含有1% ZnO纳米颗粒的II组弯曲强度最高。方差分析显示p值<0.001，具有高度统计学意义。
用ZnO和TiO纳米颗粒改性的纳米复合义齿基托树脂比传统义齿基托树脂具有更高的弯曲强度和表面硬度。
通过添加这些纳米颗粒可以提高义齿基托材料的硬度，以便在口腔中长期使用以及在容易发生义齿折断的情况下使用。
