The effects of dowel design and load direction on dowel-and-core restorations
Statement of problem. Complications such as loosening of the dowel and core or fracture of the remaining tooth root can be influenced by many factors, including the amount of remaining dentin, direction of the occlusal load, and design of the dowel. Most stress analyses of dowel and cores were condu...
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| Veröffentlicht in: | The Journal of prosthetic dentistry 2001-06, Vol.85 (6), p.558-567 |
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| container_title | The Journal of prosthetic dentistry |
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| creator | Yang, Hong-So Lang, Lisa A. Molina, Anthony Felton, David A. |
| description | Statement of problem. Complications such as loosening of the dowel and core or fracture of the remaining tooth root can be influenced by many factors, including the amount of remaining dentin, direction of the occlusal load, and design of the dowel. Most stress analyses of dowel and cores were conducted without including all aspects of the restorations and supporting structures. Purpose. The purpose of this study was to investigate the influence of occlusal stresses on various dowel designs in a restored, endodontically treated maxillary incisor by using a 2-dimensional finite element analysis model. Material and methods. A 2-dimensional finite element model was constructed in a labiolingual cross-sectional view of a maxillary central incisor, a dowel, a core, and the supporting tissues to investigate stresses in various dowel designs. As a control, a metal-ceramic crown on an endodontically treated tooth without a dowel and core was modeled. A 10-kg force was applied as follows: (1) in a vertical load on the incisal edge, (2) in a horizontal load on the labial surface, and (3) in a 20-degree diagonal load on the lingual surface. Results. The use of a dowel reduced the peak dentinal stress to 75% of the magnitude of the control. When a vertical force was applied, the magnitudes of stress of the various dowel designs were similar; however, when loaded horizontally, the short dowel produced the greatest dentinal stress concentration, and the tapered dowel showed the greatest stress concentration within the cement layer. Greater deflections and higher stresses were generated with horizontal loading. Conclusion. The dowel and core provided little reinforcement to the remaining tooth. The direction of the functional load had a greater effect than dowel design on maximum stress and displacement. Parallel-sided dowel and cores with a length of 12 mm distributed the stress widely in the restoration and dentin, resulting in the smallest stresses. (J Prosthet Dent 2001;85:558-67.) |
| doi_str_mv | 10.1067/mpr.2001.115504 |
| format | Article |
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Complications such as loosening of the dowel and core or fracture of the remaining tooth root can be influenced by many factors, including the amount of remaining dentin, direction of the occlusal load, and design of the dowel. Most stress analyses of dowel and cores were conducted without including all aspects of the restorations and supporting structures. Purpose. The purpose of this study was to investigate the influence of occlusal stresses on various dowel designs in a restored, endodontically treated maxillary incisor by using a 2-dimensional finite element analysis model. Material and methods. A 2-dimensional finite element model was constructed in a labiolingual cross-sectional view of a maxillary central incisor, a dowel, a core, and the supporting tissues to investigate stresses in various dowel designs. As a control, a metal-ceramic crown on an endodontically treated tooth without a dowel and core was modeled. A 10-kg force was applied as follows: (1) in a vertical load on the incisal edge, (2) in a horizontal load on the labial surface, and (3) in a 20-degree diagonal load on the lingual surface. Results. The use of a dowel reduced the peak dentinal stress to 75% of the magnitude of the control. When a vertical force was applied, the magnitudes of stress of the various dowel designs were similar; however, when loaded horizontally, the short dowel produced the greatest dentinal stress concentration, and the tapered dowel showed the greatest stress concentration within the cement layer. Greater deflections and higher stresses were generated with horizontal loading. Conclusion. The dowel and core provided little reinforcement to the remaining tooth. The direction of the functional load had a greater effect than dowel design on maximum stress and displacement. Parallel-sided dowel and cores with a length of 12 mm distributed the stress widely in the restoration and dentin, resulting in the smallest stresses. (J Prosthet Dent 2001;85:558-67.)</description><identifier>ISSN: 0022-3913</identifier><identifier>EISSN: 1097-6841</identifier><identifier>DOI: 10.1067/mpr.2001.115504</identifier><identifier>PMID: 11404756</identifier><language>eng</language><publisher>United States: Mosby, Inc</publisher><subject>Bite Force ; Computer Simulation ; Crowns ; Dental Porcelain - chemistry ; Dental Prosthesis Design ; Dental Restoration Failure ; Dentin - pathology ; Dentin - physiopathology ; Dentistry ; Finite Element Analysis ; Gold Alloys - chemistry ; Gutta-Percha - chemistry ; Humans ; Incisor - physiopathology ; Maxilla - physiopathology ; Metal Ceramic Alloys - chemistry ; Models, Biological ; Periodontal Ligament - physiopathology ; Post and Core Technique ; Root Canal Filling Materials - chemistry ; Root Canal Therapy ; Stress, Mechanical ; Surface Properties ; Tooth Fractures - etiology ; Tooth Root - injuries ; Zinc Phosphate Cement - chemistry</subject><ispartof>The Journal of prosthetic dentistry, 2001-06, Vol.85 (6), p.558-567</ispartof><rights>2001 Editorial Council of The Journal of Prosthetic Dentistry</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c409t-839897b95207c61616dcdf0ec52884dc448ba759b4cffa1393809ec9cc0cce563</citedby><cites>FETCH-LOGICAL-c409t-839897b95207c61616dcdf0ec52884dc448ba759b4cffa1393809ec9cc0cce563</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1067/mpr.2001.115504$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,777,781,3537,27905,27906,45976</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/11404756$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Yang, Hong-So</creatorcontrib><creatorcontrib>Lang, Lisa A.</creatorcontrib><creatorcontrib>Molina, Anthony</creatorcontrib><creatorcontrib>Felton, David A.</creatorcontrib><title>The effects of dowel design and load direction on dowel-and-core restorations</title><title>The Journal of prosthetic dentistry</title><addtitle>J Prosthet Dent</addtitle><description>Statement of problem. Complications such as loosening of the dowel and core or fracture of the remaining tooth root can be influenced by many factors, including the amount of remaining dentin, direction of the occlusal load, and design of the dowel. Most stress analyses of dowel and cores were conducted without including all aspects of the restorations and supporting structures. Purpose. The purpose of this study was to investigate the influence of occlusal stresses on various dowel designs in a restored, endodontically treated maxillary incisor by using a 2-dimensional finite element analysis model. Material and methods. A 2-dimensional finite element model was constructed in a labiolingual cross-sectional view of a maxillary central incisor, a dowel, a core, and the supporting tissues to investigate stresses in various dowel designs. As a control, a metal-ceramic crown on an endodontically treated tooth without a dowel and core was modeled. A 10-kg force was applied as follows: (1) in a vertical load on the incisal edge, (2) in a horizontal load on the labial surface, and (3) in a 20-degree diagonal load on the lingual surface. Results. The use of a dowel reduced the peak dentinal stress to 75% of the magnitude of the control. When a vertical force was applied, the magnitudes of stress of the various dowel designs were similar; however, when loaded horizontally, the short dowel produced the greatest dentinal stress concentration, and the tapered dowel showed the greatest stress concentration within the cement layer. Greater deflections and higher stresses were generated with horizontal loading. Conclusion. The dowel and core provided little reinforcement to the remaining tooth. The direction of the functional load had a greater effect than dowel design on maximum stress and displacement. Parallel-sided dowel and cores with a length of 12 mm distributed the stress widely in the restoration and dentin, resulting in the smallest stresses. (J Prosthet Dent 2001;85:558-67.)</description><subject>Bite Force</subject><subject>Computer Simulation</subject><subject>Crowns</subject><subject>Dental Porcelain - chemistry</subject><subject>Dental Prosthesis Design</subject><subject>Dental Restoration Failure</subject><subject>Dentin - pathology</subject><subject>Dentin - physiopathology</subject><subject>Dentistry</subject><subject>Finite Element Analysis</subject><subject>Gold Alloys - chemistry</subject><subject>Gutta-Percha - chemistry</subject><subject>Humans</subject><subject>Incisor - physiopathology</subject><subject>Maxilla - physiopathology</subject><subject>Metal Ceramic Alloys - chemistry</subject><subject>Models, Biological</subject><subject>Periodontal Ligament - physiopathology</subject><subject>Post and Core Technique</subject><subject>Root Canal Filling Materials - chemistry</subject><subject>Root Canal Therapy</subject><subject>Stress, Mechanical</subject><subject>Surface Properties</subject><subject>Tooth Fractures - etiology</subject><subject>Tooth Root - injuries</subject><subject>Zinc Phosphate Cement - chemistry</subject><issn>0022-3913</issn><issn>1097-6841</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2001</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp1kD1PwzAQhi0EoqUwsyFPbGnPiZ3EI6r4kopYymwl5wsEJXGxWxD_HpdUYkJn6Yb38Sv7YexSwFxAXiz6jZ-nAGIuhFIgj9hUgC6SvJTimE0B0jTJtMgm7CyEdwAoVSFO2UQICbJQ-ZQ9rd-IU9MQbgN3DbfuizpuKbSvA68GyztXWW5bH4HWDTyeXySJWYLOE_cUts5X-zScs5Om6gJdHPaMvdzdrpcPyer5_nF5s0pQgt4mZaZLXdRapVBgLuJYtA0QqrQspUUpy7oqlK4lNk0lMp2VoAk1IiCSyrMZux57N9597OIDTN8GpK6rBnK7YArQIo0iIrgYQfQuBE-N2fi2r_y3EWD2Bk00aPYGzWgw3rg6VO_qnuwff1AWAT0CFD_42ZI3AVsakEZJxrr23_IfebB_YA</recordid><startdate>20010601</startdate><enddate>20010601</enddate><creator>Yang, Hong-So</creator><creator>Lang, Lisa A.</creator><creator>Molina, Anthony</creator><creator>Felton, David A.</creator><general>Mosby, Inc</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20010601</creationdate><title>The effects of dowel design and load direction on dowel-and-core restorations</title><author>Yang, Hong-So ; Lang, Lisa A. ; Molina, Anthony ; Felton, David A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c409t-839897b95207c61616dcdf0ec52884dc448ba759b4cffa1393809ec9cc0cce563</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2001</creationdate><topic>Bite Force</topic><topic>Computer Simulation</topic><topic>Crowns</topic><topic>Dental Porcelain - chemistry</topic><topic>Dental Prosthesis Design</topic><topic>Dental Restoration Failure</topic><topic>Dentin - pathology</topic><topic>Dentin - physiopathology</topic><topic>Dentistry</topic><topic>Finite Element Analysis</topic><topic>Gold Alloys - chemistry</topic><topic>Gutta-Percha - chemistry</topic><topic>Humans</topic><topic>Incisor - physiopathology</topic><topic>Maxilla - physiopathology</topic><topic>Metal Ceramic Alloys - chemistry</topic><topic>Models, Biological</topic><topic>Periodontal Ligament - physiopathology</topic><topic>Post and Core Technique</topic><topic>Root Canal Filling Materials - chemistry</topic><topic>Root Canal Therapy</topic><topic>Stress, Mechanical</topic><topic>Surface Properties</topic><topic>Tooth Fractures - etiology</topic><topic>Tooth Root - injuries</topic><topic>Zinc Phosphate Cement - chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yang, Hong-So</creatorcontrib><creatorcontrib>Lang, Lisa A.</creatorcontrib><creatorcontrib>Molina, Anthony</creatorcontrib><creatorcontrib>Felton, David A.</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>The Journal of prosthetic dentistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yang, Hong-So</au><au>Lang, Lisa A.</au><au>Molina, Anthony</au><au>Felton, David A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The effects of dowel design and load direction on dowel-and-core restorations</atitle><jtitle>The Journal of prosthetic dentistry</jtitle><addtitle>J Prosthet Dent</addtitle><date>2001-06-01</date><risdate>2001</risdate><volume>85</volume><issue>6</issue><spage>558</spage><epage>567</epage><pages>558-567</pages><issn>0022-3913</issn><eissn>1097-6841</eissn><abstract>Statement of problem. Complications such as loosening of the dowel and core or fracture of the remaining tooth root can be influenced by many factors, including the amount of remaining dentin, direction of the occlusal load, and design of the dowel. Most stress analyses of dowel and cores were conducted without including all aspects of the restorations and supporting structures. Purpose. The purpose of this study was to investigate the influence of occlusal stresses on various dowel designs in a restored, endodontically treated maxillary incisor by using a 2-dimensional finite element analysis model. Material and methods. A 2-dimensional finite element model was constructed in a labiolingual cross-sectional view of a maxillary central incisor, a dowel, a core, and the supporting tissues to investigate stresses in various dowel designs. As a control, a metal-ceramic crown on an endodontically treated tooth without a dowel and core was modeled. A 10-kg force was applied as follows: (1) in a vertical load on the incisal edge, (2) in a horizontal load on the labial surface, and (3) in a 20-degree diagonal load on the lingual surface. Results. The use of a dowel reduced the peak dentinal stress to 75% of the magnitude of the control. When a vertical force was applied, the magnitudes of stress of the various dowel designs were similar; however, when loaded horizontally, the short dowel produced the greatest dentinal stress concentration, and the tapered dowel showed the greatest stress concentration within the cement layer. Greater deflections and higher stresses were generated with horizontal loading. Conclusion. The dowel and core provided little reinforcement to the remaining tooth. The direction of the functional load had a greater effect than dowel design on maximum stress and displacement. Parallel-sided dowel and cores with a length of 12 mm distributed the stress widely in the restoration and dentin, resulting in the smallest stresses. (J Prosthet Dent 2001;85:558-67.)</abstract><cop>United States</cop><pub>Mosby, Inc</pub><pmid>11404756</pmid><doi>10.1067/mpr.2001.115504</doi><tpages>10</tpages></addata></record> |
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| source | MEDLINE; Elsevier ScienceDirect Journals |
| subjects | Bite Force Computer Simulation Crowns Dental Porcelain - chemistry Dental Prosthesis Design Dental Restoration Failure Dentin - pathology Dentin - physiopathology Dentistry Finite Element Analysis Gold Alloys - chemistry Gutta-Percha - chemistry Humans Incisor - physiopathology Maxilla - physiopathology Metal Ceramic Alloys - chemistry Models, Biological Periodontal Ligament - physiopathology Post and Core Technique Root Canal Filling Materials - chemistry Root Canal Therapy Stress, Mechanical Surface Properties Tooth Fractures - etiology Tooth Root - injuries Zinc Phosphate Cement - chemistry |
| title | The effects of dowel design and load direction on dowel-and-core restorations |
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