title: Effect of bending on the mechanical properties of gold wrought-wire clasps: a non-linear finite element analysis.
abstract: The purpose of this study was to assess the effect of bending of dental gold alloy wires on the mechanical characteristics of wrought-wire clasps. We conducted a simulation of large deformation in straight wires by means of non-linear finite element (FE) analysis. A bending force increased the principal tensile stress on the outer surface of the bending corner and the compressive stress on the inner surface of the bending corner to their maximum values. After unloading with springback, a residual tensile stress was produced on the inner surface. A gold alloy wire clasp exhibited a relatively greater flexibility with small permanent deformation after the clasp tip deflection as compared to previously reported data for Co-Cr wires; this suggests that it is suitable for periodontally compromised teeth. Wire clasps are more susceptible to failure as compared to straight wrought wires because of the residual stress produced during the bending process.
authors.affiliation: Removable Prosthodontics, School of Dentistry, Iwate Medical University, Iwate, Japan. nooda@iwate-med.ac.jp
authors.forename: Nobusuke
authors.initials: N
authors.lastname: Oda
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Wakabayashi
authors.forename: Takayuki
authors.initials: T
authors.lastname: Yoneyama
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Suzuki
mesh_terms: D002858:Chromium Alloys / Q000737:chemistry; D003198:Computer Simulation; D016734:Dental Clasps; D020342:Finite Element Analysis; D006047:Gold Alloys / Q000737:chemistry*; D006801:Humans; D021621:Imaging, Three-Dimensional; D008422:Materials Testing; D055595:Mechanical Phenomena; D017711:Nonlinear Dynamics; D018583:Pliability; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D002858:Chromium Alloys; D006047:Gold Alloys