The effects of load misalignment on tensile load testing of direct bonded orthodontic brackets—a finite element model

https://doi.org/10.1016/S0889-5406(94)70138-5Get rights and content

A finite element model (FEM) of an orthodontic bracket bonded to enamel with glass ionomer cement was developed. The loading on the model simulated tensile loading conditions associated with the testing of bonding system strength. The primary purpose of this project was to ascertain the effects of load misalignment on the calculated stresses within the cement layer. The results indicate that peak stress values increase as the load deflection angulation increases. If the tensile load is inadvertently applied entirely on one wing of the bracket, the stress components nearly double in magnitude.

References (29)

  • GwinnettAJ

    A comparison of shear bond strengths of metal and ceramic brackets

    Am J Orthod Dentofac Orthop

    (1988)
  • McCleaCPJ et al.

    Comparison of tensile and shear strength of new and recycled orthodontic metal brackets

    N Z Dent J

    (1986)
  • NorevallL-I et al.

    Tensile and shear strength of orthodontic bracket bonding with glass ionomer cement and acrylic resin

    Swed Dent J

    (1990)
  • TavasMA et al.

    Glass ionomer for direct bonding: an in vitro assessment

    Br J Orthod

    (1990)
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    From Indiana University and Purdue University at Indianapolis, Biomechanics and Biomaterials Research Center and the School of Dentistry

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