Retention force of T-bar clasps for titanium and cobalt-chromium removable partial dentures

The objective of this study was to evaluate the retention force of T-bar clasps made from commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) alloy by the insertion/removal test simulating 5 years use. Thirty-six frameworks were cast from CP Ti (n=18) and Co-Cr alloy (n=18) with identical prefabricated patterns on refractory casts from a distal extension mandibular hemi-arch segment. The castings were made on a vacuum-pressure machine, under vacuum and argon atmosphere. Each group was subdivided in three, corresponding to 0.25 mm, 0.50 mm and 0.75 mm undercuts, respectively. No polishing procedures were performed to ensure uniformity. The specimens were subjected to an insertion/removal test and data was analyzed statistically to compare CP Ti and Co-Cr alloy in the same undercut (Student's t-test for independent samples) and each material in different undercuts (one-way ANOVA) (p=0.05). Comparisons between materials revealed significant differences (p=0.017) only for the 0.50-mm undercut. No significant differences (p>0.05) were found when comparing the same material for the undercuts. It may be concluded that for different undercuts, both Co-Cr alloy and CP Ti had no significant differences for T-bar clasps; CP Ti showed the lowest retention force values when compared to Co-Cr alloy in each undercut, but with significant difference only for the 0.50-mm undercut; and both materials maintained the retentive capacity during the simulation test.

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Main Authors: Rodrigues,Renata Cristina Silveira, Macedo,Ana Paula, Torres,Érica Miranda de, Mattos,Maria da Glória Chiarello de, Ribeiro,Ricardo Faria
Format: Digital revista
Language:English
Published: Fundação Odontológica de Ribeirão Preto 2008
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-64402008000300006
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spelling oai:scielo:S0103-644020080003000062008-10-16Retention force of T-bar clasps for titanium and cobalt-chromium removable partial denturesRodrigues,Renata Cristina SilveiraMacedo,Ana PaulaTorres,Érica Miranda deMattos,Maria da Glória Chiarello deRibeiro,Ricardo Faria titanium dental clasps denture retention denture partial removable chromium alloys The objective of this study was to evaluate the retention force of T-bar clasps made from commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) alloy by the insertion/removal test simulating 5 years use. Thirty-six frameworks were cast from CP Ti (n=18) and Co-Cr alloy (n=18) with identical prefabricated patterns on refractory casts from a distal extension mandibular hemi-arch segment. The castings were made on a vacuum-pressure machine, under vacuum and argon atmosphere. Each group was subdivided in three, corresponding to 0.25 mm, 0.50 mm and 0.75 mm undercuts, respectively. No polishing procedures were performed to ensure uniformity. The specimens were subjected to an insertion/removal test and data was analyzed statistically to compare CP Ti and Co-Cr alloy in the same undercut (Student's t-test for independent samples) and each material in different undercuts (one-way ANOVA) (p=0.05). Comparisons between materials revealed significant differences (p=0.017) only for the 0.50-mm undercut. No significant differences (p>0.05) were found when comparing the same material for the undercuts. It may be concluded that for different undercuts, both Co-Cr alloy and CP Ti had no significant differences for T-bar clasps; CP Ti showed the lowest retention force values when compared to Co-Cr alloy in each undercut, but with significant difference only for the 0.50-mm undercut; and both materials maintained the retentive capacity during the simulation test.info:eu-repo/semantics/openAccessFundação Odontológica de Ribeirão PretoBrazilian Dental Journal v.19 n.3 20082008-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-64402008000300006en10.1590/S0103-64402008000300006
institution SCIELO
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country Brasil
countrycode BR
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access En linea
databasecode rev-scielo-br
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region America del Sur
libraryname SciELO
language English
format Digital
author Rodrigues,Renata Cristina Silveira
Macedo,Ana Paula
Torres,Érica Miranda de
Mattos,Maria da Glória Chiarello de
Ribeiro,Ricardo Faria
spellingShingle Rodrigues,Renata Cristina Silveira
Macedo,Ana Paula
Torres,Érica Miranda de
Mattos,Maria da Glória Chiarello de
Ribeiro,Ricardo Faria
Retention force of T-bar clasps for titanium and cobalt-chromium removable partial dentures
author_facet Rodrigues,Renata Cristina Silveira
Macedo,Ana Paula
Torres,Érica Miranda de
Mattos,Maria da Glória Chiarello de
Ribeiro,Ricardo Faria
author_sort Rodrigues,Renata Cristina Silveira
title Retention force of T-bar clasps for titanium and cobalt-chromium removable partial dentures
title_short Retention force of T-bar clasps for titanium and cobalt-chromium removable partial dentures
title_full Retention force of T-bar clasps for titanium and cobalt-chromium removable partial dentures
title_fullStr Retention force of T-bar clasps for titanium and cobalt-chromium removable partial dentures
title_full_unstemmed Retention force of T-bar clasps for titanium and cobalt-chromium removable partial dentures
title_sort retention force of t-bar clasps for titanium and cobalt-chromium removable partial dentures
description The objective of this study was to evaluate the retention force of T-bar clasps made from commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) alloy by the insertion/removal test simulating 5 years use. Thirty-six frameworks were cast from CP Ti (n=18) and Co-Cr alloy (n=18) with identical prefabricated patterns on refractory casts from a distal extension mandibular hemi-arch segment. The castings were made on a vacuum-pressure machine, under vacuum and argon atmosphere. Each group was subdivided in three, corresponding to 0.25 mm, 0.50 mm and 0.75 mm undercuts, respectively. No polishing procedures were performed to ensure uniformity. The specimens were subjected to an insertion/removal test and data was analyzed statistically to compare CP Ti and Co-Cr alloy in the same undercut (Student's t-test for independent samples) and each material in different undercuts (one-way ANOVA) (p=0.05). Comparisons between materials revealed significant differences (p=0.017) only for the 0.50-mm undercut. No significant differences (p>0.05) were found when comparing the same material for the undercuts. It may be concluded that for different undercuts, both Co-Cr alloy and CP Ti had no significant differences for T-bar clasps; CP Ti showed the lowest retention force values when compared to Co-Cr alloy in each undercut, but with significant difference only for the 0.50-mm undercut; and both materials maintained the retentive capacity during the simulation test.
publisher Fundação Odontológica de Ribeirão Preto
publishDate 2008
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-64402008000300006
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