Microtensile specimen attachment and shape--finite element analysis

C J Soares; P V Soares; P C F Santos-Filho; S R Armstrong

doi:10.1177/154405910808700116

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Microtensile specimen attachment and shape--finite element analysis

Journal article

Peer reviewed

Microtensile specimen attachment and shape--finite element analysis

C J Soares, P V Soares, P C F Santos-Filho and S R Armstrong

Journal of dental research, Vol.87(1), pp.89-93

01/2008

DOI: 10.1177/154405910808700116

PMID: 18096901

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Abstract

Microtensile bond strength values are influenced by specimen shape and attachment method to the gripping device during testing. We hypothesized that stress distribution inside the testing specimen is affected by microtensile specimen shape and attachment method. Rectangular, hourglass-, and dumbbell-shaped specimens, all with a 1 mm(2) cross-sectional testing region, were modeled as indirect ceramic restorations luted to dentin. Three specimen attachments were investigated: (1) posterior surface; (2) posterior, superior, and lateral surfaces; and (3) all surfaces. Qualitative and quantitative analyses were carried out according to von Mises' criteria. Stress analysis showed a direct correlation between attachment modes and stress distribution, with shear stresses observed in models with less surface attachment. Increasing the number of faces for specimen attachment to the metallic gripping device resulted in a more homogeneous and regular distribution of stress, with tensile stress concentrated at the adhesive interface. Dumbbell-shaped specimens showed improved stress distribution compared with rectangular and hourglass-shaped specimens.

Elasticity

Finite Element Analysis

Materials Testing

Tensile Strength

Bisphenol A-Glycidyl Methacrylate - chemistry

Dental Stress Analysis - instrumentation

Dental Porcelain - chemistry

Humans

Resin Cements - chemistry

Stress, Mechanical

Dentin - ultrastructure

Polyethylene Glycols - chemistry

Polymethacrylic Acids - chemistry

Lithium Compounds - chemistry

Dental Materials - chemistry

Surface Properties

Dental Bonding - methods

Imaging, Three-Dimensional

Details

Title: Subtitle: Microtensile specimen attachment and shape--finite element analysis
Creators: C J Soares - Biomechanics group, School of Dentistry, Federal University of Uberlândia, Av. Pará 1720, Bloco 2B, sala 2B24, 38400-902, Uberlândia, MG, Brazil. carlosjsoares@umuarama.ufu.br
P V Soares
P C F Santos-Filho
S R Armstrong
Resource Type: Journal article
Publication Details: Journal of dental research, Vol.87(1), pp.89-93
Publisher: United States
DOI: 10.1177/154405910808700116
PMID: 18096901
ISSN: 0022-0345
eISSN: 1544-0591
Language: English
Date published: 01/2008
Academic Unit: Operative Dentistry
Record Identifier: 9984066077402771

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