The mainly used polymeric material for the denture is PMMA because of its cost and easiness to handle. So it was widely used material among dentists for past decades. But the acrylic-based denture materials have several common weak points such as shrinkage after curing and lack of strength. In order...
The mainly used polymeric material for the denture is PMMA because of its cost and easiness to handle. So it was widely used material among dentists for past decades. But the acrylic-based denture materials have several common weak points such as shrinkage after curing and lack of strength. In order to solve these problems, we adapted one of hybrid system using acrylic polymer and vinyloligosilsesquioxane(POSS). POSS, which is a well known expandable monomer during polymerization process, may eventually suppress volumetric shrinkage. And the hybrid system makes it possible for the polymer to be stable in various severe conditions. Eight different kinds of samples were designed and synthesized. Each samples were characterized with dynamic mechanical analyser(DMA) to confirm their thermodynamic properties, fractured to analyze the cross-sectional morphology of the samples. And elongation, flexural and impact tests were also executed to evaluate the mechanical properties of the samples. From the results, hybrid composites had well defined crosslinked network structure compared to the widely used denture materials, and the mechanical strength improved without changing any surface condition as increment with POSS ratio in hybrid system. Fractured morphology showed homogeneous surfaces in spite of mutli component system, therefore we can conclude that the adoption of the POSS brought the reinforcement of the denture resin.
The mainly used polymeric material for the denture is PMMA because of its cost and easiness to handle. So it was widely used material among dentists for past decades. But the acrylic-based denture materials have several common weak points such as shrinkage after curing and lack of strength. In order to solve these problems, we adapted one of hybrid system using acrylic polymer and vinyloligosilsesquioxane(POSS). POSS, which is a well known expandable monomer during polymerization process, may eventually suppress volumetric shrinkage. And the hybrid system makes it possible for the polymer to be stable in various severe conditions. Eight different kinds of samples were designed and synthesized. Each samples were characterized with dynamic mechanical analyser(DMA) to confirm their thermodynamic properties, fractured to analyze the cross-sectional morphology of the samples. And elongation, flexural and impact tests were also executed to evaluate the mechanical properties of the samples. From the results, hybrid composites had well defined crosslinked network structure compared to the widely used denture materials, and the mechanical strength improved without changing any surface condition as increment with POSS ratio in hybrid system. Fractured morphology showed homogeneous surfaces in spite of mutli component system, therefore we can conclude that the adoption of the POSS brought the reinforcement of the denture resin.
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가설 설정
1. The cured samples all showed very smooth and clean surfaces.
제안 방법
In this article, we tried to develope the PMMA-POSS hybrid composite system and characterize that how POSS functions in acrylic polymer matrix in order to build up complete denture material compared with commercial acrylic based denture resin.
5 cm) with diamond cutter for the surface and inner morphology investigation. The samples surfaces were carefully observed with optical microscopy and the cross sectional area with SEM to investigate the inner pores and roughness. The Dynamic Mechanical Analysis(DMA : TA instrument, USA) measuremants were performed to characterize the thermodynamic properties of the samples.
대상 데이터
The Paladent®20 (Heraeus Kulzer, Germany) was purchased and used as base denture resin. The 1, 3, 5, 7, 9, 11, 13, 15-octavinylpentacyclooctasilox-ane(POSS; Aldrich Chemical.
성능/효과
2. The addition of POSS do not change the outlook morphology, but fractured surface was completely different. POSS reacted with MMA and formed dense network structure.
3. Flexural and impact test result showed that as POSS is added, mechanical strength increases, but not as so when more POSS is added via THF.
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