The Difference and Correlation of Modulus of Elasticity and Surface Hardness of PMMA and Thermoplastic Nylon Denture Base Materials

摘要

Mechanical properties of materials are necessary to be considered in manufacturing denture base. Some parameters of mechanical properties are modulus of elasticity and surface hardness, which can be the factors that affect the resistance of a denture. PMMA (Huge) and thermoplastic nylon (Bio-Tone, Vertex thermosens and TCS) denture base materials with the size 64x10x3.3 mm3 for the modulus of elasticity (n=6) and 10x10x3 mm3 for surface hardness (n=6) were evaluated. The modulus of elasticity was measured by using Universal Testing Machine and surface hardness was measured by using Vickers Hardness Testing Machine. Data were statistically analyzed with one-way ANOVA test and followed by Tukey’s post hoc test (P .01). Based on the one-way ANOVA test there was significant difference of modulus of elasticity between PMMA and thermoplastic nylon, and there was significant difference of surface hardness between PMMA and thermoplastic nylon as well. The Pearson correlation test showed a positive correlation between modulus of elasticity and surface hardness. PMMA showed higher modulus of elasticity and higher surface hardness than thermoplastic nylon. A positive correlation was found between modulus of elasticity and surface hardness.