Date

2002

Author

Keskin, Selda

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Acrylic resins are now the most important material used as denture base resins. In application process, the color stability of these materials is an important concerned. This study evaluated the color stability of denture base resins; heat polymerized and auto-polymerized denture base polymers at 25°C, 35°C, and 55°C. The color characteristics were determined using tristimulus colorimeter. The samples were subjected to coffee and tea for a week to test color stability. Coffee exhibited higher staining capacity than tea. mIn dental applications, dentists advise their patients to use household bleach in order to disinfect denture materials. The hypochlorite treatment may cause chlorine addition reaction that will lead to the formation of cancerogenic compounds. This study aimed to investigate this effect and it was found that the chlorine addition is possible. The spectroscopic analysis showed that the compounds present in tea and coffee stained the dental material. These compounds are mostly caffeine and its derivatives. DMA and DSC were used to determine the thermal behaviour of samples. It was concluded that the materials are crosslinked. Mechanical tests were performed and it was found that the hypochlorite treatment weakens the mechanical properties. The surface properties of the materials were also investigated with the aid of optical microscope

Subject Keywords

Polymers, Dental materials, Color stability, Hypochlorite treatment, Mechanical properties

URI

https://hdl.handle.net/11511/12371

Collections

Graduate School of Natural and Applied Sciences, Thesis