Study of deflections in maxillary major connectors: a finite element analysis.
Identifieur interne : 000316 ( PubMed/Checkpoint ); précédent : 000315; suivant : 000317Study of deflections in maxillary major connectors: a finite element analysis.
Auteurs : Nandakishore Bhojaraju ; J. Srilakshmi [Inde] ; G. Vishwanath [Libye]Source :
- Journal of Indian Prosthodontic Society [ 0972-4052 ] ; 2014.
Abstract
The Major connector is the major component of the cast partial denture to which all other parts are directly or indirectly attached. It also provides cross arch stability to help resist displacement by functional stresses. The major connector should be rigid. A flexible major connector causes an unequal distribution of forces with changes in their intensity and may cause damage to the supporting structures. Thus rigidity is of paramount to resist flexing and torquing forces. The commonly used major connectors for the maxillary arch are Anteroposterior strap, palatal strap and complete palatal plate. Application of load on the prosthesis will result in deflection. The magnitude and direction of the deflection that the prosthesis undergoes depends on the rigidity of the major connector. (1) To determine the deflection seen in maxillary removable partial denture frameworks under simulated occlusal load. (2) To compare the rigidity and deflection characteristics of different maxillary major connectors used in maxillary Kennedy's class I, class II, class III and class IV situations. A CT scan of human edentulous maxilla was taken and each section from the incisive foramen to the hamular notch was projected on the graph paper and three dimensional volumes were created from the connected successive profiles to define the final solid geometry of bone. Six framework models with different Maxillary major connectors such as Anteroposterior straps and complete palatal plate for Kennedy's class I, class II, class III and class IV situations were created. Three Dimensional Finite Element Models corresponding to the geometric model were created using ANSYS 9.0 version. The model was assigned the material properties. A vertical biting force of 20 N was applied. The results showed maximum displacements were observed at the posterior edge of the saddle for all the frameworks. Anteroposterior palatal strap in class III and class IV situation showed the least deflection when compared to class I and class II (distal extension situation) Anteroposterior palatal strap is more rigid connector than the full palatal plate, single palatal strap, and U-shaped palatal strap and can be used in all situations.
DOI: 10.1007/s13191-012-0237-3
PubMed: 24604998
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Srilakshmi</name><affiliation wicri:level="1"><nlm:affiliation>Department of Prosthodontics, The Oxford Dental College, Hospital and Research Centre, Bangalore, India.</nlm:affiliation><country xml:lang="fr">Inde</country><wicri:regionArea>Department of Prosthodontics, The Oxford Dental College, Hospital and Research Centre, Bangalore</wicri:regionArea><wicri:noRegion>Bangalore</wicri:noRegion></affiliation></author><author><name sortKey="Vishwanath, G" sort="Vishwanath, G" uniqKey="Vishwanath G" first="G" last="Vishwanath">G. Vishwanath</name><affiliation wicri:level="1"><nlm:affiliation>University of Benghazi, Benghazi, Libya.</nlm:affiliation><country xml:lang="fr">Libye</country><wicri:regionArea>University of Benghazi, Benghazi</wicri:regionArea><wicri:noRegion>Benghazi</wicri:noRegion></affiliation></author></analytic><series><title level="j">Journal of Indian Prosthodontic Society</title><idno type="ISSN">0972-4052</idno><imprint><date when="2014" type="published">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The Major connector is the major component of the cast partial denture to which all other parts are directly or indirectly attached. It also provides cross arch stability to help resist displacement by functional stresses. The major connector should be rigid. A flexible major connector causes an unequal distribution of forces with changes in their intensity and may cause damage to the supporting structures. Thus rigidity is of paramount to resist flexing and torquing forces. The commonly used major connectors for the maxillary arch are Anteroposterior strap, palatal strap and complete palatal plate. Application of load on the prosthesis will result in deflection. The magnitude and direction of the deflection that the prosthesis undergoes depends on the rigidity of the major connector. (1) To determine the deflection seen in maxillary removable partial denture frameworks under simulated occlusal load. (2) To compare the rigidity and deflection characteristics of different maxillary major connectors used in maxillary Kennedy's class I, class II, class III and class IV situations. A CT scan of human edentulous maxilla was taken and each section from the incisive foramen to the hamular notch was projected on the graph paper and three dimensional volumes were created from the connected successive profiles to define the final solid geometry of bone. Six framework models with different Maxillary major connectors such as Anteroposterior straps and complete palatal plate for Kennedy's class I, class II, class III and class IV situations were created. Three Dimensional Finite Element Models corresponding to the geometric model were created using ANSYS 9.0 version. The model was assigned the material properties. A vertical biting force of 20 N was applied. The results showed maximum displacements were observed at the posterior edge of the saddle for all the frameworks. Anteroposterior palatal strap in class III and class IV situation showed the least deflection when compared to class I and class II (distal extension situation) Anteroposterior palatal strap is more rigid connector than the full palatal plate, single palatal strap, and U-shaped palatal strap and can be used in all situations.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">24604998</PMID><DateCompleted><Year>2014</Year><Month>03</Month><Day>07</Day></DateCompleted><DateRevised><Year>2017</Year><Month>02</Month><Day>20</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0972-4052</ISSN><JournalIssue CitedMedium="Print"><Volume>14</Volume><Issue>1</Issue><PubDate><Year>2014</Year><Month>Mar</Month></PubDate></JournalIssue><Title>Journal of Indian Prosthodontic Society</Title><ISOAbbreviation>J Indian Prosthodont Soc</ISOAbbreviation></Journal><ArticleTitle>Study of deflections in maxillary major connectors: a finite element analysis.</ArticleTitle><Pagination><MedlinePgn>50-60</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1007/s13191-012-0237-3</ELocationID><Abstract><AbstractText>The Major connector is the major component of the cast partial denture to which all other parts are directly or indirectly attached. It also provides cross arch stability to help resist displacement by functional stresses. The major connector should be rigid. A flexible major connector causes an unequal distribution of forces with changes in their intensity and may cause damage to the supporting structures. Thus rigidity is of paramount to resist flexing and torquing forces. The commonly used major connectors for the maxillary arch are Anteroposterior strap, palatal strap and complete palatal plate. Application of load on the prosthesis will result in deflection. The magnitude and direction of the deflection that the prosthesis undergoes depends on the rigidity of the major connector. (1) To determine the deflection seen in maxillary removable partial denture frameworks under simulated occlusal load. (2) To compare the rigidity and deflection characteristics of different maxillary major connectors used in maxillary Kennedy's class I, class II, class III and class IV situations. A CT scan of human edentulous maxilla was taken and each section from the incisive foramen to the hamular notch was projected on the graph paper and three dimensional volumes were created from the connected successive profiles to define the final solid geometry of bone. Six framework models with different Maxillary major connectors such as Anteroposterior straps and complete palatal plate for Kennedy's class I, class II, class III and class IV situations were created. Three Dimensional Finite Element Models corresponding to the geometric model were created using ANSYS 9.0 version. The model was assigned the material properties. A vertical biting force of 20 N was applied. The results showed maximum displacements were observed at the posterior edge of the saddle for all the frameworks. Anteroposterior palatal strap in class III and class IV situation showed the least deflection when compared to class I and class II (distal extension situation) Anteroposterior palatal strap is more rigid connector than the full palatal plate, single palatal strap, and U-shaped palatal strap and can be used in all situations.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Bhojaraju</LastName><ForeName>Nandakishore</ForeName><Initials>N</Initials><AffiliationInfo><Affiliation>Department of Prosthodontics, Rajarajeswari Dental College, Bangalore, Karnataka India ; 393, 11th A Cross, 25th Main, 1st Phase JP Nagar, Bangalore, Karnataka India.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Srilakshmi</LastName><ForeName>J</ForeName><Initials>J</Initials><AffiliationInfo><Affiliation>Department of Prosthodontics, The Oxford Dental College, Hospital and Research Centre, Bangalore, India.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Vishwanath</LastName><ForeName>G</ForeName><Initials>G</Initials><AffiliationInfo><Affiliation>University of Benghazi, Benghazi, Libya.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2012</Year><Month>12</Month><Day>27</Day></ArticleDate></Article><MedlineJournalInfo><Country>India</Country><MedlineTA>J Indian Prosthodont Soc</MedlineTA><NlmUniqueID>101255941</NlmUniqueID><ISSNLinking>0972-4052</ISSNLinking></MedlineJournalInfo><CommentsCorrectionsList><CommentsCorrections RefType="Cites"><RefSource>J Prosthet Dent. 1999 May;81(5):526-32</RefSource><PMID Version="1">10220656</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>Int J Prosthodont. 2002 Sep-Oct;15(5):433-8</RefSource><PMID Version="1">12375456</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>J Prosthet Dent. 1989 Nov;62(5):557-62</RefSource><PMID Version="1">2691659</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>J Prosthet Dent. 1973 Jul;30(1):102-5</RefSource><PMID Version="1">4575203</PMID></CommentsCorrections></CommentsCorrectionsList><OtherID Source="NLM">PMC3935043</OtherID><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">Deflection</Keyword><Keyword MajorTopicYN="N">Displacement</Keyword><Keyword MajorTopicYN="N">Finite element analysis</Keyword><Keyword MajorTopicYN="N">Major connector</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2012</Year><Month>12</Month><Day>05</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2012</Year><Month>12</Month><Day>14</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2014</Year><Month>3</Month><Day>8</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2014</Year><Month>3</Month><Day>8</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2014</Year><Month>3</Month><Day>8</Day><Hour>6</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">24604998</ArticleId><ArticleId IdType="doi">10.1007/s13191-012-0237-3</ArticleId><ArticleId IdType="pii">237</ArticleId><ArticleId IdType="pmc">PMC3935043</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Inde</li><li>Libye</li></country></list><tree><noCountry><name sortKey="Bhojaraju, Nandakishore" sort="Bhojaraju, Nandakishore" uniqKey="Bhojaraju N" first="Nandakishore" last="Bhojaraju">Nandakishore Bhojaraju</name></noCountry><country name="Inde"><noRegion><name sortKey="Srilakshmi, J" sort="Srilakshmi, J" uniqKey="Srilakshmi J" first="J" last="Srilakshmi">J. Srilakshmi</name></noRegion></country><country name="Libye"><noRegion><name sortKey="Vishwanath, G" sort="Vishwanath, G" uniqKey="Vishwanath G" first="G" last="Vishwanath">G. Vishwanath</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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