Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
Vol. 9, No. 4, 2010, pp. 439-442
Bioline Code: os10051
Full paper language: English
Document type: Research Article
Document available free of charge
Brazilian Journal of Oral Sciences, Vol. 9, No. 4, 2010, pp. 439-442
© Copyright 2010 Braz J Oral Sci.
Shear bond strength test using different loading conditions - a finite element analysis|
Braz, Rodivan; Sinhoreti, Mário Alexandre Coelho; Spazzin, Aloísio Oro; Loretto, Sandro Cordeiro; de Castro Lyra, Arine Maria Viveros & de Meira-Júnior, Agenor Dias
Aim: This study evaluated the stress distribution at the bond interface during shear bond strength testing for three loading conditions.
Methods: A three-dimensional model was created of a specimen for evaluation by the shear bond strength test, using three cylindrical volumes representing the dentin, adhesive system and composite resin. A linear analysis was performed to calculate the stress distribution at the dentin-adhesive interface. Three models simulating different loading conditions were prepared: chisel, orthodontic-looped wire and stainless steel tape.
Results: Chisel presented severe stress concentrations near the loading site (-10681 to 637 MPa). Wire presented stress concentrations along the radial loading axis (-382 to 216 MPa). Tape presented more uniform stress distribution (-83 to 21 MPa).
Conclusions: The loading with stainless steel tape allowed more uniform stress distribution at the bond interface, and was a more reliable way to evaluate the bond with regard to the aim of the shear bond strength test.
shear bond strength, stress distribution, loading.
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