Mohamed S H, Arifin A, Mohd Ishak Z A, Nizam A, Samsudin A R
School of Materials & Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia.
Med J Malaysia. 2004 May;59 Suppl B:25-6.
The aim of this study was to evaluate the effect of powder-to-liquid ratio on the glass transition temperature (Tg) and the tensile properties of denture base material prepared from poly (methyl methacrylate) (PMMA) and hydroxyapatite (HA) previously treated with 3-trimethoxysilylpropyl methacrylate (gamma-MPS). Specimens for mechanical testing were prepared by adding composites powder (PMMA, BPO and HA) to the monomer (MMA and EGDMA) followed by hand mixing as in dental laboratory description usage. The glass transition temperature was studied by using differential scanning calorimetry (DSC). It was observed that the tensile properties and the Tg were affected by the powder-to-liquid ratio. The mechanical characterization of the materials were performed by using single edge notch-tension (SEN-T) specimens; the fracture toughness was slightly higher in formulation which contained HA filler compared to commercial denture base material.
本研究的目的是评估粉液比对由聚甲基丙烯酸甲酯（PMMA）和经甲基丙烯酸3-三甲氧基硅丙酯（γ-MPS）预处理的羟基磷灰石（HA）制备的义齿基托材料的玻璃化转变温度（Tg）和拉伸性能的影响。通过将复合粉末（PMMA、BPO和HA）添加到单体（MMA和EGDMA）中，然后按照牙科实验室说明书中的用法进行手工混合，制备用于机械测试的试样。使用差示扫描量热法（DSC）研究玻璃化转变温度。观察到拉伸性能和Tg受粉液比的影响。通过使用单边切口拉伸（SEN-T）试样对材料进行力学表征；与市售义齿基托材料相比，含有HA填料的配方的断裂韧性略高。
