Establishment of a Modulus Measurement Method in Denture-supporting Tissue using an Intraoral Simultaneous Measurement System and Finite Element Analysis

Abstract

Aim: A three-dimensional finite element analysis (3D FEA) study for measuring optimum elasticity using thickness and load data collected from elderly edentulous patients when feeling pressure-related pain. Materials and methods:Tested elasticity as in a previous report ("measured elasticity") is measured using an able FEA ("optimum elasticity"). A two-way analysis of variance (ANOVA) was performed and Pearson's correlation coefficients were obtained. Pearson's correlation coefficients were also determined for thickness (mm), measured elasticity, and optimum elasticity (MPa) in different experimental areas. Finally, the von Mises stresses and subsidence (mm) results of the FEA were tested using measured elasticity; those using optimum elasticity were measured with a two-way ANOVA.Results: Seventeen patients were studied. Optimum elasticity was significantly lower than measured elasticity (p < 0.05). Correlations were found in all three palatal areas (p < 0.01). A correlation between thickness and measured elasticity was found at the midpoint (p < 0.05) but not at the median or lateral sections. No correlation between thickness and optimum elasticity was found in any of the three palate areas. Finite-element analysis results using measured elasticity indicated no differences in von Mises stress at any site when compared with FEA results using optimum elasticity. Subsidence was significantly smaller (p < 0.05). Conclusion:It is difficult to estimate elasticity using the thickness of denture-supporting tissue and necessary to optimize elasticity in all palatal areas when using an FEA. We established a method to measure elasticity.Clinical significance: If it were possible to optimize elasticity in a 3D FEA of maxillary denture-supporting tissue, it would become possible to design an optimal relief area through simulation. This would reduce the burden on the patient, such as the need for adjustment after wearing dentures, and improve quality of life.