title: Tensile and shear stresses in the orthodontic attachment adhesive layer with 3D finite element analysis.
abstract: The tests commonly used for the evaluation of orthodontic adhesives measure tensile and shear bond strength. The two methods were compared with finite element analysis using a three-dimensional model and the effect of misalignment of the tensile and shear forces was calculated. Applying a shear load produces significant compressive and tensile stresses in the adhesive layer. Under ideal conditions of shear loading, the induced tensile stress is over 5 times the induced shear stress. The model shows that a tensile load induces predominantly tensile stresses in the adhesive layer. The calculations indicate that the tensile test method is a robust testing method with low sensitivity to misalignment of the applied load.
authors.affiliation: Department of Orthodontics, College of Dentistry, University of Illinois at Chicago 60612-7211, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Thomas
authors.forename: W G
authors.initials: WG
authors.lastname: de Rijk
authors.forename: C A
authors.initials: CA
authors.lastname: Evans
mesh_terms: D000269:Adhesives; D019245:Compressive Strength; D003198:Computer Simulation; D001840:Dental Bonding; D003799:Dental Stress Analysis / Q000379:methods*; D020342:Finite Element Analysis; D016910:Orthodontic Brackets; D015203:Reproducibility of Results; D013314:Stress, Mechanical; D013718:Tensile Strength
chemical_list: D000269:Adhesives