Journal article
Effect of specimen gripping device, geometry and fixation method on microtensile bond strength, failure mode and stress distribution: Laboratory and finite element analyses
Dental materials, Vol.28(5), pp.e50-e62
05/2012
DOI: 10.1016/j.dental.2012.02.010
PMID: 22425572
Abstract
Innumerous modifications have been proposed for the microtensile test since its introduction; however, testing parameters are not often well described and wide variations in bond strength are commonly reported. The aim of this study was to evaluate the effect of the test specimen's gripping device, specimen geometry and fixation method on microtensile bond strength, failure mode, and stress distribution when using an etch-and-rinse 2-step adhesive system bonded to human dentin.
Resin-based composite bonded to occlusal dentin from 21 human molars was used to fabricate dumbbell- and stick-shaped test specimens which were divided into three groups: Di – dumbbell-specimens placed in a Dircks device; GeS – stick-specimens gripped in a Geraldeli's device with Superglue; GeZ – stick-specimens gripped in a Geraldeli's device with Zapit. Specimens were tested to failure in tensile mode and the failure mode was examined under stereomicroscopy and fracture initiation sites were verified by scanning electron microscopy and energy dispersive X-ray spectroscopy. Three-dimensional models of each device/specimen were created and finite element calculations were performed.
The effect of the gripping devices on the bond strength was not significant, unless the bond test areas were normalized. The failure mode was influenced by the type of device. Dircks device was less sensitive to human error than Geraldeli's, and produced a more uniform stress distribution at the dumbbell specimen adhesive layer than did the Geraldeli's device at the stick layer.
Microtensile testing parameters can directly influence the results and consequently inter-study comparisons.
Details
- Title: Subtitle
- Effect of specimen gripping device, geometry and fixation method on microtensile bond strength, failure mode and stress distribution: Laboratory and finite element analyses
- Creators
- Luís H.A Raposo - Biomechanics Research Group, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, MG, BrazilSteven R Armstrong - Department of Operative Dentistry, University of Iowa College of Dentistry, Iowa City, IA, USARodrigo R Maia - Health Directory, Brazilian Air Force, Rio de Janeiro, Rio de Janeiro, BrazilFang Qian - Department of Preventive and Community Dentistry, College of Dentistry, University of Iowa, Iowa City, IA, USASaulo Geraldeli - Department of Restorative Dental Sciences, Operative Dentistry Division, University of Florida, Gainesville, FL, USACarlos J Soares - Biomechanics Research Group, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, MG, Brazil
- Resource Type
- Journal article
- Publication Details
- Dental materials, Vol.28(5), pp.e50-e62
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.dental.2012.02.010
- PMID
- 22425572
- ISSN
- 0109-5641
- eISSN
- 1879-0097
- Language
- English
- Date published
- 05/2012
- Academic Unit
- Preventive and Community Dentistry; Operative Dentistry; Dental Research
- Record Identifier
- 9984065804802771
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