Comparative study of two commercially pure titanium casting methods
Identifieur interne : 003018 ( Pmc/Curation ); précédent : 003017; suivant : 003019Comparative study of two commercially pure titanium casting methods
Auteurs : Renata Cristina Silveira Rodrigues [Brésil] ; Adriana Claudia Lapria Faria [Brésil] ; Iara Augusta Orsi [Brésil] ; Maria Da Gloria Chiarello De Mattos [Brésil] ; Ana Paula Macedo [Brésil] ; Ricardo Faria Ribeiro [Brésil]Source :
- Journal of Applied Oral Science [ 1678-7757 ] ; 2010.
Abstract
The interest in using titanium to fabricate removable partial denture (RPD) frameworks has increased, but there are few studies evaluating the effects of casting methods on clasp behavior.
This study compared the occurrence of porosities and the retentive force of commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) removable partial denture circumferential clasps cast by induction/centrifugation and plasma/vacuum-pressure.
72 frameworks were cast from CP Ti (n=36) and Co-Cr alloy (n=36; control group). For each material, 18 frameworks were casted by electromagnetic induction and injected by centrifugation, whereas the other 18 were casted by plasma and injected by vacuum-pressure. For each casting method, three subgroups (n=6) were formed: 0.25 mm, 0.50 mm, and 0.75 mm undercuts. The specimens were radiographed and subjected to an insertion/removal test simulating 5 years of framework use. Data were analyzed by ANOVA and Tukey's to compare materials and cast methods (α=0.05).
Three of 18 specimens of the induction/centrifugation group and 9 of 18 specimens of plasma/vacuum-pressure cast presented porosities, but only 1 and 7 specimens, respectively, were rejected for simulation test. For Co-Cr alloy, no defects were found. Comparing the casting methods, statistically significant differences (p<0.05) were observed only for the Co-Cr alloy with 0.25 mm and 0.50 mm undercuts. Significant differences were found for the 0.25 mm and 0.75 mm undercuts dependent on the material used. For the 0.50 mm undercut, significant differences were found when the materials were induction casted.
Although both casting methods produced satisfactory CP Ti RPD frameworks, the occurrence of porosities was greater in the plasma/vacuum-pressure than in the induction/centrifugation method, the latter resulting in higher clasp rigidity, generating higher retention force values.
Url:
DOI: 10.1590/S1678-77572010000500010
PubMed: 21085805
PubMed Central: 4246380
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Comparative study of two commercially pure titanium casting
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<author><name sortKey="Rodrigues, Renata Cristina Silveira" sort="Rodrigues, Renata Cristina Silveira" uniqKey="Rodrigues R" first="Renata Cristina Silveira" last="Rodrigues">Renata Cristina Silveira Rodrigues</name>
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<author><name sortKey="Faria, Adriana Claudia Lapria" sort="Faria, Adriana Claudia Lapria" uniqKey="Faria A" first="Adriana Claudia Lapria" last="Faria">Adriana Claudia Lapria Faria</name>
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<series><title level="j">Journal of Applied Oral Science</title>
<idno type="ISSN">1678-7757</idno>
<idno type="eISSN">1678-7765</idno>
<imprint><date when="2010">2010</date>
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<front><div type="abstract" xml:lang="en"><p>The interest in using titanium to fabricate removable partial denture (RPD)
frameworks has increased, but there are few studies evaluating the effects of casting
methods on clasp behavior.</p>
<sec><title>Objective</title>
<p>This study compared the occurrence of porosities and the retentive force of
commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) removable partial
denture circumferential clasps cast by induction/centrifugation and
plasma/vacuum-pressure.</p>
</sec>
<sec><title>Material and Methods</title>
<p>72 frameworks were cast from CP Ti (n=36) and Co-Cr alloy (n=36; control group).
For each material, 18 frameworks were casted by electromagnetic induction and
injected by centrifugation, whereas the other 18 were casted by plasma and
injected by vacuum-pressure. For each casting method, three subgroups (n=6) were
formed: 0.25 mm, 0.50 mm, and 0.75 mm undercuts. The specimens were radiographed
and subjected to an insertion/removal test simulating 5 years of framework use.
Data were analyzed by ANOVA and Tukey's to compare materials and cast methods
(α=0.05).</p>
</sec>
<sec><title>Results</title>
<p>Three of 18 specimens of the induction/centrifugation group and 9 of 18 specimens
of plasma/vacuum-pressure cast presented porosities, but only 1 and 7 specimens,
respectively, were rejected for simulation test. For Co-Cr alloy, no defects were
found. Comparing the casting methods, statistically significant differences
(p<0.05) were observed only for the Co-Cr alloy with 0.25 mm and 0.50 mm
undercuts. Significant differences were found for the 0.25 mm and 0.75 mm
undercuts dependent on the material used. For the 0.50 mm undercut, significant
differences were found when the materials were induction casted.</p>
</sec>
<sec><title>Conclusion</title>
<p>Although both casting methods produced satisfactory CP Ti RPD frameworks, the
occurrence of porosities was greater in the plasma/vacuum-pressure than in the
induction/centrifugation method, the latter resulting in higher clasp rigidity,
generating higher retention force values.</p>
</sec>
</div>
</front>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">J Appl Oral Sci</journal-id>
<journal-id journal-id-type="iso-abbrev">J Appl Oral Sci</journal-id>
<journal-title-group><journal-title>Journal of Applied Oral Science</journal-title>
</journal-title-group>
<issn pub-type="ppub">1678-7757</issn>
<issn pub-type="epub">1678-7765</issn>
<publisher><publisher-name>Faculdade de Odontologia de Bauru da Universidade de São
Paulo</publisher-name>
</publisher>
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<article-meta><article-id pub-id-type="pmid">21085805</article-id>
<article-id pub-id-type="pmc">4246380</article-id>
<article-id pub-id-type="doi">10.1590/S1678-77572010000500010</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Original Articles</subject>
</subj-group>
</article-categories>
<title-group><article-title>Comparative study of two commercially pure titanium casting
methods</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>RODRIGUES</surname>
<given-names>Renata Cristina Silveira</given-names>
</name>
<xref ref-type="aff" rid="aff01">1</xref>
<xref ref-type="corresp" rid="c01"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>FARIA</surname>
<given-names>Adriana Claudia Lapria</given-names>
</name>
<xref ref-type="aff" rid="aff02">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>ORSI</surname>
<given-names>Iara Augusta</given-names>
</name>
<xref ref-type="aff" rid="aff03">3</xref>
</contrib>
<contrib contrib-type="author"><name><surname>de MATTOS</surname>
<given-names>Maria da Gloria Chiarello</given-names>
</name>
<xref ref-type="aff" rid="aff04">4</xref>
</contrib>
<contrib contrib-type="author"><name><surname>MACEDO</surname>
<given-names>Ana Paula</given-names>
</name>
<xref ref-type="aff" rid="aff05">5</xref>
</contrib>
<contrib contrib-type="author"><name><surname>RIBEIRO</surname>
<given-names>Ricardo Faria</given-names>
</name>
<xref ref-type="aff" rid="aff04">4</xref>
</contrib>
</contrib-group>
<aff id="aff01"> 1- DDS, MSc, PhD, Assistant Professor, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.</aff>
<aff id="aff02"> 2- DDS, MSc, Graduate student, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.</aff>
<aff id="aff03"> 3- DDS, MSc, PhD, Associate Professor, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.</aff>
<aff id="aff04"> 4- DDS, MSc, PhD, Full Professor, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.</aff>
<aff id="aff05"> 5- Electrical Engineer, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.</aff>
<author-notes><corresp id="c01"><bold>Corresponding address:</bold>
Dra. Renata Cristina Silveira
Rodrigues - Departamento de Materiais Dentários e Prótese - Faculdade
de Odontologia de Ribeirão Preto, Universidade de São Paulo - Av. do
Café, s/n - Monte Alegre - Ribeirão Preto, SP - Brasil - 14040-904 -
Phone: +55 (16) 3602-4005 - Fax: +55 (16) 3633-0999 - e-mail:
<email>renata@forp.usp.br</email>
</corresp>
</author-notes>
<pub-date pub-type="epub-ppub"><season>Sep-Oct</season>
<year>2010</year>
</pub-date>
<pmc-comment>Fake ppub date generated by PMC from publisher
pub-date/@pub-type='epub-ppub' </pmc-comment>
<pub-date pub-type="ppub"><season>Sep-Oct</season>
<year>2010</year>
</pub-date>
<volume>18</volume>
<issue>5</issue>
<fpage>487</fpage>
<lpage>492</lpage>
<history><date date-type="received"><day>05</day>
<month>3</month>
<year>2009</year>
</date>
<date date-type="rev-recd"><day>28</day>
<month>9</month>
<year>2009</year>
</date>
<date date-type="accepted"><day>16</day>
<month>2</month>
<year>2010</year>
</date>
</history>
<permissions><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc/3.0/"><license-p>This is an Open Access article distributed under the terms of the Creative
Commons Attribution Non-Commercial License which permits unrestricted
non-commercial use, distribution, and reproduction in any medium, provided the
original work is properly cited.</license-p>
</license>
</permissions>
<abstract><p>The interest in using titanium to fabricate removable partial denture (RPD)
frameworks has increased, but there are few studies evaluating the effects of casting
methods on clasp behavior.</p>
<sec><title>Objective</title>
<p>This study compared the occurrence of porosities and the retentive force of
commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) removable partial
denture circumferential clasps cast by induction/centrifugation and
plasma/vacuum-pressure.</p>
</sec>
<sec><title>Material and Methods</title>
<p>72 frameworks were cast from CP Ti (n=36) and Co-Cr alloy (n=36; control group).
For each material, 18 frameworks were casted by electromagnetic induction and
injected by centrifugation, whereas the other 18 were casted by plasma and
injected by vacuum-pressure. For each casting method, three subgroups (n=6) were
formed: 0.25 mm, 0.50 mm, and 0.75 mm undercuts. The specimens were radiographed
and subjected to an insertion/removal test simulating 5 years of framework use.
Data were analyzed by ANOVA and Tukey's to compare materials and cast methods
(α=0.05).</p>
</sec>
<sec><title>Results</title>
<p>Three of 18 specimens of the induction/centrifugation group and 9 of 18 specimens
of plasma/vacuum-pressure cast presented porosities, but only 1 and 7 specimens,
respectively, were rejected for simulation test. For Co-Cr alloy, no defects were
found. Comparing the casting methods, statistically significant differences
(p<0.05) were observed only for the Co-Cr alloy with 0.25 mm and 0.50 mm
undercuts. Significant differences were found for the 0.25 mm and 0.75 mm
undercuts dependent on the material used. For the 0.50 mm undercut, significant
differences were found when the materials were induction casted.</p>
</sec>
<sec><title>Conclusion</title>
<p>Although both casting methods produced satisfactory CP Ti RPD frameworks, the
occurrence of porosities was greater in the plasma/vacuum-pressure than in the
induction/centrifugation method, the latter resulting in higher clasp rigidity,
generating higher retention force values.</p>
</sec>
</abstract>
<kwd-group><kwd>Chromium alloys</kwd>
<kwd>Dental casting technique</kwd>
<kwd>Materials testing</kwd>
<kwd>Removable partial dentures</kwd>
<kwd>Titanium</kwd>
</kwd-group>
<funding-group><award-group><funding-source>State of São Paulo Research Foundation</funding-source>
<award-id>#98/13868-9</award-id>
</award-group>
</funding-group>
</article-meta>
</front>
</pmc>
</record>
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