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- W2388492074 abstract "Objective To compare the flexural strength of the four kinds of room curing denture materials of polymethyl methacrylate(PMMA),and observe the physical conformation section through confocal laser scanning microscope(CLSM) in order to find the relationship between the macro-bending force and the microstructure.Methods Four room curing PMMA materials were produced by Tokuyama(hard-liner type),Nisshin(fiber type),Heraeus(fiber type),and Shanghai dental(simple type).Each of the room curing PMMA was prepared by a group of 10 specimens.According to ISO1567,room temperature 20℃ and vendors powder liquid ratio with the stainless steel molds were performed to prepare samples,flexural strength was measured on the test machine.The cross-section was analyzed with CLSM.Results The flexural strengths of four kinds of room curing PMMA were(41.00±12.22),(87.80±14.82),(76.30±7.51),and(81.20±8.93) MPa,respectively;there wre significant differences in the flexural strengths between Tokuyama and Nisshin,Heraeus(P0.05),there was significant difference between Shanghai dental and Tokuyama(P0.05),but there was no significant difference between Shanghai dental and Nisshin,Heraeus(P0.05).In the cross-section image of Nisshin group the complete degree and the number of micro-cracks were significantly higher than others,there was no significant difference between Heraeus and Shanghai dental,Tokuyama was the lowest.Conclusion Tokuyama has the lowest flexural strength,Nisshin maximum,Heraeus similarity with Shanghai dental.When the flexural strength of the material is stronger,there are more micro-cracks from the cross-section." @default.
- W2388492074 created "2016-06-24" @default.
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- W2388492074 date "2011-01-01" @default.
- W2388492074 modified "2023-09-26" @default.
- W2388492074 title "Relationship between flexural strength of room curing PMMA and cross-section observation under confocal laser scanning microscope" @default.
- W2388492074 hasPublicationYear "2011" @default.
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