Radiopacity and microhardness changes and effect of X-ray operating voltage in resin-based materials before and after the expiration date
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Materials research (São Carlos. Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000300006 |
Resumo: | This study observed alteration in the radiopacity and microhardness of expired resin-based materials compared to non-expired materials and the operating characteristics of the X-ray source used. Five 2 mm-thick cured specimens were prepared for each material: composite resins (P60®, Z100®), and a compomer (Dyract AP®). Radiopacity of the specimens was evaluated comparing the density of the resin-based material to an equivalent (mm) density of a 99.5% pure aluminum step wedge using a transmission densitometer. Surface microhardness measurements were carried out using a calibrated Vickers indenter on three different points of the same surface. ANOVA and Tukey tests (pre-set alpha = 0.05) revealed that expired materials showed no significant change in radiopacity. One material (Filtek P60) demonstrated lower radiopacity with lower KVp. Change in microhardness wa s statistically significant for Z100: for this material, the microhardness after expiration was significantly lower than before the expiration date. |
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Radiopacity and microhardness changes and effect of X-ray operating voltage in resin-based materials before and after the expiration dateradiopacityexpiration datecompositesoperating voltagemicrohardnessThis study observed alteration in the radiopacity and microhardness of expired resin-based materials compared to non-expired materials and the operating characteristics of the X-ray source used. Five 2 mm-thick cured specimens were prepared for each material: composite resins (P60®, Z100®), and a compomer (Dyract AP®). Radiopacity of the specimens was evaluated comparing the density of the resin-based material to an equivalent (mm) density of a 99.5% pure aluminum step wedge using a transmission densitometer. Surface microhardness measurements were carried out using a calibrated Vickers indenter on three different points of the same surface. ANOVA and Tukey tests (pre-set alpha = 0.05) revealed that expired materials showed no significant change in radiopacity. One material (Filtek P60) demonstrated lower radiopacity with lower KVp. Change in microhardness wa s statistically significant for Z100: for this material, the microhardness after expiration was significantly lower than before the expiration date.ABM, ABC, ABPol2004-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000300006Materials Research v.7 n.3 2004reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392004000300006info:eu-repo/semantics/openAccessTirapelli,CamilaPanzeri,Fernanda de CarvalhoPanzeri,HeitorPardini,Luiz CarlosZaniquelli,Osvaldoeng2004-08-16T00:00:00Zoai:scielo:S1516-14392004000300006Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2004-08-16T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.none.fl_str_mv |
Radiopacity and microhardness changes and effect of X-ray operating voltage in resin-based materials before and after the expiration date |
title |
Radiopacity and microhardness changes and effect of X-ray operating voltage in resin-based materials before and after the expiration date |
spellingShingle |
Radiopacity and microhardness changes and effect of X-ray operating voltage in resin-based materials before and after the expiration date Tirapelli,Camila radiopacity expiration date composites operating voltage microhardness |
title_short |
Radiopacity and microhardness changes and effect of X-ray operating voltage in resin-based materials before and after the expiration date |
title_full |
Radiopacity and microhardness changes and effect of X-ray operating voltage in resin-based materials before and after the expiration date |
title_fullStr |
Radiopacity and microhardness changes and effect of X-ray operating voltage in resin-based materials before and after the expiration date |
title_full_unstemmed |
Radiopacity and microhardness changes and effect of X-ray operating voltage in resin-based materials before and after the expiration date |
title_sort |
Radiopacity and microhardness changes and effect of X-ray operating voltage in resin-based materials before and after the expiration date |
author |
Tirapelli,Camila |
author_facet |
Tirapelli,Camila Panzeri,Fernanda de Carvalho Panzeri,Heitor Pardini,Luiz Carlos Zaniquelli,Osvaldo |
author_role |
author |
author2 |
Panzeri,Fernanda de Carvalho Panzeri,Heitor Pardini,Luiz Carlos Zaniquelli,Osvaldo |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Tirapelli,Camila Panzeri,Fernanda de Carvalho Panzeri,Heitor Pardini,Luiz Carlos Zaniquelli,Osvaldo |
dc.subject.por.fl_str_mv |
radiopacity expiration date composites operating voltage microhardness |
topic |
radiopacity expiration date composites operating voltage microhardness |
description |
This study observed alteration in the radiopacity and microhardness of expired resin-based materials compared to non-expired materials and the operating characteristics of the X-ray source used. Five 2 mm-thick cured specimens were prepared for each material: composite resins (P60®, Z100®), and a compomer (Dyract AP®). Radiopacity of the specimens was evaluated comparing the density of the resin-based material to an equivalent (mm) density of a 99.5% pure aluminum step wedge using a transmission densitometer. Surface microhardness measurements were carried out using a calibrated Vickers indenter on three different points of the same surface. ANOVA and Tukey tests (pre-set alpha = 0.05) revealed that expired materials showed no significant change in radiopacity. One material (Filtek P60) demonstrated lower radiopacity with lower KVp. Change in microhardness wa s statistically significant for Z100: for this material, the microhardness after expiration was significantly lower than before the expiration date. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-09-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000300006 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000300006 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1516-14392004000300006 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
ABM, ABC, ABPol |
publisher.none.fl_str_mv |
ABM, ABC, ABPol |
dc.source.none.fl_str_mv |
Materials Research v.7 n.3 2004 reponame:Materials research (São Carlos. Online) instname:Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL |
instname_str |
Universidade Federal de São Carlos (UFSCAR) |
instacron_str |
ABM ABC ABPOL |
institution |
ABM ABC ABPOL |
reponame_str |
Materials research (São Carlos. Online) |
collection |
Materials research (São Carlos. Online) |
repository.name.fl_str_mv |
Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR) |
repository.mail.fl_str_mv |
dedz@power.ufscar.br |
_version_ |
1754212657732255744 |