Application of a Glass Fiber-reinforced Composite Material to Clasps-The Effects of Immersion and Repeated Loading-

Abstract

The aim of this study was to investigate the effects of water immersion and repeated loading on the mechanical properties

Stress Analysis of Clasps Made of Glass Fiber-reinforced Composite Material Using Three-dimensional Finite Element Method: Influence of Shape in Cross and Longitudinal Sections of Circumferential Clasp Arms

“…Loading condition Loading direction in this study was set as the radial direction of the cylinder, and supposing the second premolar as the abutment tooth. As Morris et al pointed out in their report 19) , this loading condition seemed to be more representative of actual clasps with regard to function than experimental loading conditions 3) . This is because the tip of the clasp arm is typically subjected to deflection in the radial direction during insertion and removal.…”

“…In this study, tensile longitudinal modulus, E33 , was substituted with elastic modulus obtained in a three-point flexural test in our previous study 3) . Values for transverse modulus E11 ( E22), shear modulus G31 ( G23), Poisson's ratios 31 ( 32) and 12 (where '3' stands for longitudinal direction (parallel to fiber direction), and '1' and '2' refer to two mutually perpendicular directions in the transverse plane) were taken from published literature 7) .…”

“…Table 2 shows the orthotropic material's properties used in this study. These elastic constants were set by assuming the use of Vectris Pontic, which we had used for material testing and clinical trials [1][2][3][4] . Elastic modulus 33 (E33), which represented longitudinal elastic modulus, was obtained from our material testing measurements 3) .…”

“…These elastic constants were set by assuming the use of Vectris Pontic, which we had used for material testing and clinical trials [1][2][3][4] . Elastic modulus 33 (E33), which represented longitudinal elastic modulus, was obtained from our material testing measurements 3) . The remaining constants were either taken from published literature 7) or estimated from relevant and appropriate theoretical formulas 8) .…”

“…To investigate the suitability of FRC materials for clasps, we have conducted a few studies to examine their mechanical properties (flexural strength, retentive force, permanent deformation) after fabrication into clasps [1][2][3] . Results suggested that FRC materials could be used for clasps.…”