Effect of Overall Powder-to-Liquid Ratios on Surface Hardness and Initial Viscoelasticity of A Short-Term Soft Liner Incorporated with Litsea Cubeba Oil
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Abstract
The aim of this study was to evaluate surface hardness and initial viscoelasticity of short-term denture soft liner incorporated with Litsea cubeba essential oil. The nine groups with different compositions in overall powder-to-liquid ratios (P/L = 0.9, 1.2, and 1.5) and L. cubeba oil concentrations (0, 10, and 20 %w/w) were investigated. The material hardness was determined at 2 hours and 7 days by Shore A0 durometer. The initial viscoelastic properties, including gelation time, storage (or elastic) modulus and loss (or viscous) modulus were investigated by an oscillating plate rheometer until 30 minutes after mixing the materials. Five independent experiments were done thorough the study. The surface hardness of the soft liner with and without L. cubeba oil was mainly influenced by overall P/L ratio. The soft liners with higher P/L ratio significantly showed greater surface hardness at both 2 hours and 7 days (p<0.05). The addition of L. cubeba oil at 10 %w/w did not affect the material hardness. Whereas, high concentration (20 %w/w) of L. cubeba oil significantly decreased Shore A0 hardness at 2 hours (p<0.05). The gelation time, initial elastic and viscous moduli of the soft liners were also contributed by the overall P/L ratios. The soft liner compositions with higher overall P/L ratio showed the shorter gelation times and higher initial moduli (p<0.05). No statistical effect of the L. cubeba oil concentration on the initial viscoelastic properties was observed. In conclusion, the surface hardness and initial viscoelasticity of the short-term soft liner were dominantly influenced by the overall P/L ratios. The incorporation of L. cubeba oil concentration did not dramatically affect the material hardness and initial viscoelastic properties.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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