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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Fundação Odontológica de Ribeirão Preto
2008
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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 |
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Rodrigues,Renata Cristina Silveira Macedo,Ana Paula Torres,Érica Miranda de Mattos,Maria da Glória Chiarello de Ribeiro,Ricardo Faria |
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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 |
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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. |
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Fundação Odontológica de Ribeirão Preto |
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2008 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-64402008000300006 |
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