| Summary: | 碩士 === 高雄醫學大學 === 牙醫學研究所 === 88 === Permanent soft relining materials are of great importance for some denture-wearing patients. With the character of viscoelastic properties, permanent soft relining materials may act as shock absorbers and reduce the occlusal stresses. However, the major disadvantages of soft relining materials are the lack of durable resilience and easy to be debonded from denture base materials, which leads to the proliferation of plaque bacteria and fungi. Thus, it is great concern for the development of permanent silicone soft relining materials in recent years. In this study, three commercially available permanent silicone soft relining materials and one temporary soft relining material were chosen for a series of tests to investigate whether the permanent silicone soft relining materials are appropriate for clinical usage.
First, the physical properties of the four soft relining materials were tested according to ISO 4823:1992, to see if they reached the requirement of ISO. The tested listings including experiment method and process were followed by the regulation of ISO 4823:1992. Second, change of color in the resin denture base after the application of soft relining materials was test. The color measurements were recorded before and after immerging in distilled water, coffee, soy sauce and nicotine solution for three weeks using a computer controlled spectrophotometer. Color changes (ΔE) were calculated with the use of CIE-LAB uniform color scale. Third, the bond strength between soft relining materials and PMMA denture base materials were investigated. The bond strength was determined with different surface treatment methods. At last, surface roughness was measured before and after immerging in denture cleansers using surface roughness tester.
The study results showed the physical properties of all three of permanent soft relining materials reached the requirement of ISO 4823:1992. As for color stability and bond strength, Ufi Gel C and Mollosil plus showed better characteristic. Immerging in detergent caused the increase in surface roughness of all soft relining materials. Polident denture cleanser caused the most apparent influence.
Permanent soft relining materials show better physical, mechanical properties and color stability, compared to conventional temporary soft relining materials. Therefore, these materials are appropriate for clinical application.
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