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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Influence of specimens' design and manufacturing process on microtensile bond strength to enamel: laboratory and FEA comparison

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Author(s):
Fernanda Tranchesi Sadek [1] ; Antônio Muench [2] ; Isis Andréa Poiate [3] ; Edgard Poiate Junior [4] ; Paulo Eduardo Capel Cardoso [5]
Total Authors: 5
Affiliation:
[1] University of São Paulo. Department of Dental Materials - Brasil
[2] University of São Paulo. Department of Dental Materials - Brasil
[3] Federal Fluminense University. School of Dentistry. Department of Operative Dentistry - Brasil
[4] University of São Paulo. Department of Mining and Petroleum Engineering - Brasil
[5] University of São Paulo. Department of Dental Materials - Brasil
Total Affiliations: 5
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 13, n. 2, p. 253-260, 2010-06-00.
Abstract

This study evaluated the effect of specimens' design and manufacturing process on microtensile bond strength, internal stress distributions (Finite Element Analysis - FEA) and specimens' integrity by means of Scanning Electron Microscopy (SEM) and Laser Scanning Confocal Microscopy (LCM). Excite was applied to flat enamel surface and a resin composite build-ups were made incrementally with 1-mm increments of Tetric Ceram. Teeth were cut using a diamond disc or a diamond wire, obtaining 0.8 mm² stick-shaped specimens, or were shaped with a Micro Specimen Former, obtaining dumbbell-shaped specimens (n = 10). Samples were randomly selected for SEM and LCM analysis. Remaining samples underwent microtensile test, and results were analyzed with ANOVA and Tukey test. FEA dumbbell-shaped model resulted in a more homogeneous stress distribution. Nonetheless, they failed under lower bond strengths (21.83 ± 5.44 MPa)c than stick-shaped specimens (sectioned with wire: 42.93 ± 4.77 MPaª; sectioned with disc: 36.62 ± 3.63 MPa b), due to geometric irregularities related to manufacturing process, as noted in microscopic analyzes. It could be concluded that stick-shaped, nontrimmed specimens, sectioned with diamond wire, are preferred for enamel specimens as they can be prepared in a less destructive, easier, and more precise way. (AU)