Pressure transmission area and maximum pressure transmission varied among the thermoplastic resin denture base materials. Differences in the modulus of elasticity and nanohardness of each type of denture base were demonstrated.
The elastic modulus and nanohardness of denture bases may be different based on the type of material. The purpose of this study was to compare the elastic modulus and nanohardness of polyamide and polymethyl methacrylate (PMMA) denture base materials. Three polyamide denture base materials (Valplast, Lucitone FRS, and Thermoplastic Comfort System (TCS)) and one Polymethyl methacrylate (PMMA,Triplex Hot) denture base material (n=10) were evaluated to compare their elastic modulus and nanohardness values using an ultramicroindentation system (UMIS 2000; CSIRO, Lindfield, Australia). The data were statistically analyzed using one-way ANOVA, followed by Tukey HSD and Tamhane’s post hoc tests (α=.05). The elastic modulus and nanohardness of PMMA were significantly higher compared to the polyamide groups (P<.05). All the materials showed significant differences in each of their elastic modulus and nanohardness (P<.05). The values of nanohardness and elastic modulus of each group were as follows: Triplex Hot > Lucitone FRS > Valplast > TCS. The elastic modulus and nanohardness values varied among the polyamide denture base materials. PMMA showed higher elastic modulus and nanohardness than the polyamide. A strong positive correlation existed between elastic modulus and nanohardness of the denture bases tested (R2 = 0.979, P<.05).
Introduction: The purpose of this study was to evaluate the relationship of modulus of elasticity and micro-hardness of denture bases to pressure transmission under the thermoplastic nylon denture base.Material and Methods: Mandibular first molar acrylic denture teeth (Bioeco) embedded on 15x15x3 mm3 thermoplastic nylon (TCS and BioTone) and poly methyl methacrylate denture bases were evaluated (n=9). A 100N force applied on the specimen using universal testing machine and the pressure transmitted under the specimen observed using pressure transducer. The modulus of the elasticity (n=16) measured on 64x10x3,3 mm3 specimens and micro-hardness (n=16) measured on 10x10x3 mm3 specimens. Data were statistically analyzed using One-way Anova followed by Tukey HSD post hoc test. Pearson correlation test used to evaluate the relationship of modulus of elasticity and micro-hardness on denture bases to pressure transmission (α ≥ 0,05).Results: The results showed that poly methyl methacrylate has the highest pressure transmission compared to others. There was a significant relationship between modulus of elasticity and micro-hardness to pressure transmission under the denture base.Discussion: This study can help dentists to determine the design of dentures, especially in the selection of denture base materials.
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