Different Bottom Structure of Dental Brackets Affect the Adhesiveness-Three Dimensional Finite-element Analysis
|School||Dalian Medical University|
|Keywords||Orthodontic brackets Dimensional finite element Floor structure Adhesive strength|
Objective: This study compliance optimization options, the biggest cost reduction ideas, create a different floor structure orthodontic bracket three-dimensional finite element model to determine the loading of different bottom bracket structure on the quality of the adhesive to the metal for clinical bracket direct bonding technology to provide a reference. METHODS: A three-dimensional three-dimensional model brackets. According to the standard edgewise bracket dimensions, compare dovetail bottom, square mesh, triangle mesh and diamond mesh floor structure, combined with our human teeth measured average data, the establishment of teeth - adhesive - bracket system dimensional finite element model. The same size on the model applied tension, shear and torsional forces, calculated under different loading conditions of the stress distribution and deformation of the system, and thereby compare different orthodontic brackets bonded floor structure on quality. Results 1 of four bottom bracket under the same loading stress distribution and deformation law of similarity. (2) under tension, four kinds of bottom bracket structure maximum stress suffered no significant differences in the maximum stress value for the diamond mesh bottom is 5.76Pa, the minimum value for the triangular bottom shear stress is 5.54Pa; shear force, Shading diamond maximum stress maximum of 5.31Pa, the shaded squares maximum stress value of the minimum, the 4.27Pa; torsional force, the maximum stress of diamond mesh bottom maximum of 8.19Pa, triangular end the minimum value of maximum stress, as 7.59Pa. 3 under tension, maximum deformation dovetail bottom most, 6.8 m -8 sup>, triangular-shaped end of the maximum variable minimum of 5.44 m -8 sup>; shear force under the effect of maximum deformation triangular mesh bottom most, 12.05 m -8 sup>, the smallest maximum deformation dovetail base for 10.89 m -8 sup>; torsional force, four kind of bottom bracket structure maximum deformation little difference, up to diamond mesh bottom for 12.19 m -8 sup>, a minimum of triangular end of 11.88m -8 sup >. Conclusion 1 in the three kinds of external loading conditions, shear stress most damaging anti-bracket, where the square brackets network at the end of the shear force of the strongest; while most prone to twisting forces bonding interface destruction, triangular bottom bracket slightly better than other anti-twisting bottom bracket; tensile strength, the four kinds of bottom bracket no significant difference. (2) the three external loading conditions, under tension bracket strongest resistance to deformation, including triangular mesh bottoms strongest resistance to deformation; shear stress bracket deformation resistance, followed by the bottom of the dovetail the strongest resistance to deformation; torsion bracket under the force of the worst anti-deformation capability, diamond mesh bottom deformation resistance, especially the worst. 3 Integrated backplane stress distribution and deformation conditions, the design of the triangle bottom bracket bonding effect is relatively good, and the diamond mesh bottom bracket retention capacity is relatively poor.