ORIGINAL ARTICLE

 

Shear bond strength test using different loading conditions – a finite element analysis

 

 

Rodivan Braz^I; Mário Alexandre Coelho Sinhoreti^II; Aloísio Oro Spazzin^III; Sandro Cordeiro Loretto^IV; Arine Maria Viveros de Castro Lyra^I; Agenor Dias de Meira-Júnior^V

^IDDS, MS, PhD, professor, Department of Restorative Dentistry, School of Dentistry, University of Pernambuco, Recife, PE, Brazil
^IIDDS, MS, PhD, professor, Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, State University of Campinas,
Piracicaba, SP, Brazil
^IIIDDS, research scientist, Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, State University of Campinas, Piracicaba,
SP, Brazil
^IVDDS, MS, PhD, research scientist, Department of Restorative Dentistry, Universitary Nucleus of Pará, Belém, PA, Brazil
^VMS, PhD, professor, Department of Mechanical Engineering, School of Engineering and Architecture, University of Passo Fundo, Passo Fundo, RS, Brazil

Correspondence to

 

 

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ABSTRACT

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.

Keywords: Shear bond strength, stress distribution, loading.

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Acknowledgements

The authors thank the Dr Cezar Augusto Garbin (in memoriam) for his generous help, essential for carrying of study. The Faculty of Mechanical Engineering of the Engineering and Architecture School, University of Passo Fundo, RS, for its help with the element finite analysis.

 

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Correspondence to:
Aloísio Oro Spazzin
Departmento de Odontologia Restauradora,
área Materiais Dentários,
FOP/UNICAMP, Piracicaba, SP, Brazil.
Av. Limeira 901, Vila Rezende, 13414-903,
Piracicaba, SP, Brazil;
Phone: +55 (19) 2106 5345,
Fax: +55 (19) 2106 5211
E-mail: aospazzin@yahoo.com.br

Received for publication: May 03, 2010
Accepted: August 23, 2010