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Báo cáo vật lý: "Using of HPLC Analysis for Evaluation of Residual Monomer Content in Denture Base Material and Their Effect on Mechanical Properties"

Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Using of HPLC Analysis for Evaluation of Residual Monomer Content in Denture Base Material and Their Effect on Mechanical Properties | Journal of Physical Science Vol. 19 2 127-135 2008 127 Using of HPLC Analysis for Evaluation of Residual Monomer Content in Denture Base Material and Their Effect on Mechanical Properties S.H. Mohamed1 Alb. M. Al-Jadi 2 and T. Ajaal 2 1 Higher Institute of Medical Technology P.O. Box 1458 Misurata Libya 2Academic of Postgraduate Studies Tripoli Libya Corresponding author sd_abidi@yahoo.com Abstract The samples were prepared according to the routine work for sample preparation in dental laboratories. After reaching dough stage the mixture packed into dumbbell shaped of stainless steel mould and pressed in a hydraulic bench press for 25 min at room temperature. For heat-cure the polymerization cycle was carried out using water bath while self-cure done at room temperature. The residual monomer content was evaluated using high performance liquid chromatography HPLC . The tensile test was evaluated in dry and wet condition distilled water . The results showed that the residual monomer content for heat-cure samples was 1.44 wt. while self-cure samples was 8.71 wt. . The residual monomer content of heat-cure samples was comply with ISO-1567 standard for denture base material. The heat-cure material depicted higher tensile strength tensile strain and energy at break than that of self-cure material. This is due to higher residual monomer content in self-cure which acts as plasticizer subsequently lead to reduce the properties of self-cure material. After immersion the tensile strength tensile strain and energy at break of heat-cure samples found to decrease while the self-cure samples were found to increase. Generally the heat-cure material showed better properties compared to self-cure material. Keywords residual monomer mechanical properties denture base materials 1. INTRODUCTION Poly methyl methacrylate PMMA is currently the material of choice for denture base fabrication. The denture base resin is subjected to various stresses during function. During fabrication of a .