Analysis of the coefficient of variation in shear and tensile bond strength tests

Detalhes bibliográficos
Autor(a) principal: Romano, Fábio Lourenço
Data de Publicação: 2005
Outros Autores: Ambrosano, Gláucia Maria Bovi, Magnani, Maria Beatriz Borges de Araújo, Nouer, Darcy Flávio
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Journal of applied oral science (Online)
Texto Completo: https://www.revistas.usp.br/jaos/article/view/3286
Resumo: The coefficient of variation is a dispersion measurement that does not depend on the unit scales, thus allowing the comparison of experimental results involving different variables. Its calculation is crucial for the adhesive experiments performed in laboratories because both precision and reliability can be verified. The aim of this study was to evaluate and to suggest a classification of the coefficient variation (CV) for in vitro experiments on shear and tensile strengths. The experiments were performed in laboratory by fifty international and national studies on adhesion materials. Statistical data allowing the estimation of the coefficient of variation was gathered from each scientific article since none of them had such a measurement previously calculated. Excel worksheet was used for organizing the data while the sample normality was tested by using Shapiro Wilk tests (alpha = 0.05) and the Statistical Analysis System software (SAS). A mean value of 6.11 (SD = 1.83) for the coefficient of variation was found by the data analysis and the data had a normal distribution (p>;0.05). A range classification was proposed for the coefficient of variation from such data, that is, it should be considered low for a value lesser than 2.44; intermediate for a value between 2.44 and 7.94, high for a value between 7.94 and 9.78, and finally, very high for a value greater than 9.78. Such classification can be used as a guide for experiments on adhesion materials, thus making the planning easier as well as revealing precision and validity concerning the data.
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spelling Analysis of the coefficient of variation in shear and tensile bond strength tests Análise do coeficiente de variação em testes de resistência da união ao cisalhamento e tração EstatísticaResistência ao cisalhamentoResistência à traçãoStatisticShear strengthTensile strength The coefficient of variation is a dispersion measurement that does not depend on the unit scales, thus allowing the comparison of experimental results involving different variables. Its calculation is crucial for the adhesive experiments performed in laboratories because both precision and reliability can be verified. The aim of this study was to evaluate and to suggest a classification of the coefficient variation (CV) for in vitro experiments on shear and tensile strengths. The experiments were performed in laboratory by fifty international and national studies on adhesion materials. Statistical data allowing the estimation of the coefficient of variation was gathered from each scientific article since none of them had such a measurement previously calculated. Excel worksheet was used for organizing the data while the sample normality was tested by using Shapiro Wilk tests (alpha = 0.05) and the Statistical Analysis System software (SAS). A mean value of 6.11 (SD = 1.83) for the coefficient of variation was found by the data analysis and the data had a normal distribution (p>;0.05). A range classification was proposed for the coefficient of variation from such data, that is, it should be considered low for a value lesser than 2.44; intermediate for a value between 2.44 and 7.94, high for a value between 7.94 and 9.78, and finally, very high for a value greater than 9.78. Such classification can be used as a guide for experiments on adhesion materials, thus making the planning easier as well as revealing precision and validity concerning the data. O Coeficiente de variação é uma medida de dispersão que independe da escala de unidades, permitindo comparação de resultados experimentais de variáveis diferentes. Seu cálculo é imprescindível em experimentos laboratoriais de adesão, pois a partir dele é possível verificar a precisão e confiabilidade do experimento. O objetivo deste trabalho foi avaliar e sugerir uma classificação do coeficiente de variação (CV) em experimentos in vitro que envolveram testes de resistência ao cisalhamento e / ou tração. Foram analisados 50 trabalhos de periódicos nacionais e internacionais, sendo que todos avaliaram a adesão em ensaios laboratoriais. Foram coletados em cada artigo dados estatísticos que permitiram estimar o coeficiente de variação, pois nenhum deles apresentava esta medida calculada. Os dados coletados foram organizados em Planilha Excel, sendo a normalidade da amostra testada pelo teste de Shapiro Wilk (alfa=0,05) utilizando o programa Statistical Analysis System (SAS). Pela análise dos dados, tendo os mesmos apresentados distribuição normal (p>;0,05) foi encontrado um CV médio de 6,11 com desvio-padrão de 1,83. A partir destes dados foram propostas faixas de classificação para o coeficiente de variação, ou seja, este coeficiente deve ser considerado baixo até um valor de 2,44; médio entre 2,44 - 7,94, alto entre 7,94 - 9.78 e muito alto acima de 9,78. Esta classificação poderá ser usada como guia para experimentos de adesão, facilitando o planejamento, revelando a precisão e validade dos dados. Universidade de São Paulo. Faculdade de Odontologia de Bauru2005-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/jaos/article/view/328610.1590/S1678-77572005000300008Journal of Applied Oral Science; Vol. 13 No. 3 (2005); 243-246 Journal of Applied Oral Science; Vol. 13 Núm. 3 (2005); 243-246 Journal of Applied Oral Science; v. 13 n. 3 (2005); 243-246 1678-77651678-7757reponame:Journal of applied oral science (Online)instname:Universidade de São Paulo (USP)instacron:USPenghttps://www.revistas.usp.br/jaos/article/view/3286/3976Copyright (c) 2005 Journal of Applied Oral Scienceinfo:eu-repo/semantics/openAccessRomano, Fábio LourençoAmbrosano, Gláucia Maria BoviMagnani, Maria Beatriz Borges de AraújoNouer, Darcy Flávio2012-04-27T11:50:55Zoai:revistas.usp.br:article/3286Revistahttp://www.scielo.br/jaosPUBhttps://www.revistas.usp.br/jaos/oai||jaos@usp.br1678-77651678-7757opendoar:2012-04-27T11:50:55Journal of applied oral science (Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Analysis of the coefficient of variation in shear and tensile bond strength tests
Análise do coeficiente de variação em testes de resistência da união ao cisalhamento e tração
title Analysis of the coefficient of variation in shear and tensile bond strength tests
spellingShingle Analysis of the coefficient of variation in shear and tensile bond strength tests
Romano, Fábio Lourenço
Estatística
Resistência ao cisalhamento
Resistência à tração
Statistic
Shear strength
Tensile strength
title_short Analysis of the coefficient of variation in shear and tensile bond strength tests
title_full Analysis of the coefficient of variation in shear and tensile bond strength tests
title_fullStr Analysis of the coefficient of variation in shear and tensile bond strength tests
title_full_unstemmed Analysis of the coefficient of variation in shear and tensile bond strength tests
title_sort Analysis of the coefficient of variation in shear and tensile bond strength tests
author Romano, Fábio Lourenço
author_facet Romano, Fábio Lourenço
Ambrosano, Gláucia Maria Bovi
Magnani, Maria Beatriz Borges de Araújo
Nouer, Darcy Flávio
author_role author
author2 Ambrosano, Gláucia Maria Bovi
Magnani, Maria Beatriz Borges de Araújo
Nouer, Darcy Flávio
author2_role author
author
author
dc.contributor.author.fl_str_mv Romano, Fábio Lourenço
Ambrosano, Gláucia Maria Bovi
Magnani, Maria Beatriz Borges de Araújo
Nouer, Darcy Flávio
dc.subject.por.fl_str_mv Estatística
Resistência ao cisalhamento
Resistência à tração
Statistic
Shear strength
Tensile strength
topic Estatística
Resistência ao cisalhamento
Resistência à tração
Statistic
Shear strength
Tensile strength
description The coefficient of variation is a dispersion measurement that does not depend on the unit scales, thus allowing the comparison of experimental results involving different variables. Its calculation is crucial for the adhesive experiments performed in laboratories because both precision and reliability can be verified. The aim of this study was to evaluate and to suggest a classification of the coefficient variation (CV) for in vitro experiments on shear and tensile strengths. The experiments were performed in laboratory by fifty international and national studies on adhesion materials. Statistical data allowing the estimation of the coefficient of variation was gathered from each scientific article since none of them had such a measurement previously calculated. Excel worksheet was used for organizing the data while the sample normality was tested by using Shapiro Wilk tests (alpha = 0.05) and the Statistical Analysis System software (SAS). A mean value of 6.11 (SD = 1.83) for the coefficient of variation was found by the data analysis and the data had a normal distribution (p>;0.05). A range classification was proposed for the coefficient of variation from such data, that is, it should be considered low for a value lesser than 2.44; intermediate for a value between 2.44 and 7.94, high for a value between 7.94 and 9.78, and finally, very high for a value greater than 9.78. Such classification can be used as a guide for experiments on adhesion materials, thus making the planning easier as well as revealing precision and validity concerning the data.
publishDate 2005
dc.date.none.fl_str_mv 2005-09-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://www.revistas.usp.br/jaos/article/view/3286
10.1590/S1678-77572005000300008
url https://www.revistas.usp.br/jaos/article/view/3286
identifier_str_mv 10.1590/S1678-77572005000300008
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://www.revistas.usp.br/jaos/article/view/3286/3976
dc.rights.driver.fl_str_mv Copyright (c) 2005 Journal of Applied Oral Science
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2005 Journal of Applied Oral Science
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade de São Paulo. Faculdade de Odontologia de Bauru
publisher.none.fl_str_mv Universidade de São Paulo. Faculdade de Odontologia de Bauru
dc.source.none.fl_str_mv Journal of Applied Oral Science; Vol. 13 No. 3 (2005); 243-246
Journal of Applied Oral Science; Vol. 13 Núm. 3 (2005); 243-246
Journal of Applied Oral Science; v. 13 n. 3 (2005); 243-246
1678-7765
1678-7757
reponame:Journal of applied oral science (Online)
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Journal of applied oral science (Online)
collection Journal of applied oral science (Online)
repository.name.fl_str_mv Journal of applied oral science (Online) - Universidade de São Paulo (USP)
repository.mail.fl_str_mv ||jaos@usp.br
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