Effect of heat treatment on microcrack healing behavior of a machinable dental ceramic
The purpose of this study was to evaluate the effect of annealing in air on the crack healing behavior of a machinable dental ceramic (Vita Mark II). The glass transition temperature and the softening point were determined by dilatometry. Polished Vita Mark II blocks (n = 12) were indented with a Vi...
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Veröffentlicht in: | Journal of biomedical materials research 1999, Vol.48 (6), p.791-796 |
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description | The purpose of this study was to evaluate the effect of annealing in air on the crack healing behavior of a machinable dental ceramic (Vita Mark II). The glass transition temperature and the softening point were determined by dilatometry. Polished Vita Mark II blocks (n = 12) were indented with a Vickers indenter under a 9.8 N load. Optical micrographs were taken immediately after indentation, and the crack lengths were measured. The specimens were annealed at 900°C for either 30 min, 1 h, or 2 h. One group was indented and heat treated at 400°C for 2 h as control. The ratio of crack length after annealing to crack length before annealing treatment was calculated for each indentation. Scanning electron microscopy was performed before and after annealing at 900°C for 1 h. Scanning electron microscopy revealed shortening and blunting of the cracks after annealing. Annealing in air at 900°C for either 30 min, 1 or 2 h significantly reduced the mean crack length of an indented machinable dental ceramic compared to the control group. However, the mean biaxial flexural strength was not significantly affected by an annealing treatment. © 1999 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 48: 791–796, 1999 |
doi_str_mv | 10.1002/(SICI)1097-4636(1999)48:6<791::AID-JBM5>3.0.CO;2-P |
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L. ; Holloway, J. A. ; Tarr, L. A.</creator><creatorcontrib>Denry, I. L. ; Holloway, J. A. ; Tarr, L. A.</creatorcontrib><description>The purpose of this study was to evaluate the effect of annealing in air on the crack healing behavior of a machinable dental ceramic (Vita Mark II). The glass transition temperature and the softening point were determined by dilatometry. Polished Vita Mark II blocks (n = 12) were indented with a Vickers indenter under a 9.8 N load. Optical micrographs were taken immediately after indentation, and the crack lengths were measured. The specimens were annealed at 900°C for either 30 min, 1 h, or 2 h. One group was indented and heat treated at 400°C for 2 h as control. The ratio of crack length after annealing to crack length before annealing treatment was calculated for each indentation. Scanning electron microscopy was performed before and after annealing at 900°C for 1 h. Scanning electron microscopy revealed shortening and blunting of the cracks after annealing. Annealing in air at 900°C for either 30 min, 1 or 2 h significantly reduced the mean crack length of an indented machinable dental ceramic compared to the control group. However, the mean biaxial flexural strength was not significantly affected by an annealing treatment. © 1999 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 48: 791–796, 1999</description><identifier>ISSN: 0021-9304</identifier><identifier>EISSN: 1097-4636</identifier><identifier>DOI: 10.1002/(SICI)1097-4636(1999)48:6<791::AID-JBM5>3.0.CO;2-P</identifier><identifier>PMID: 10556842</identifier><identifier>CODEN: JBMRBG</identifier><language>eng</language><publisher>New York: John Wiley & Sons, Inc</publisher><subject>Biological and medical sciences ; Ceramics ; crack healing ; Dental Materials ; Dental Restoration Wear ; heat treatment ; Hot Temperature ; machinable dental ceramic ; Medical sciences ; Microscopy, Electron, Scanning ; microstructure ; Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects) ; Stress, Mechanical ; Surface Properties ; Technology. Biomaterials. Equipments. Material. 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L.</creatorcontrib><creatorcontrib>Holloway, J. A.</creatorcontrib><creatorcontrib>Tarr, L. A.</creatorcontrib><title>Effect of heat treatment on microcrack healing behavior of a machinable dental ceramic</title><title>Journal of biomedical materials research</title><addtitle>J. Biomed. Mater. Res</addtitle><description>The purpose of this study was to evaluate the effect of annealing in air on the crack healing behavior of a machinable dental ceramic (Vita Mark II). The glass transition temperature and the softening point were determined by dilatometry. Polished Vita Mark II blocks (n = 12) were indented with a Vickers indenter under a 9.8 N load. Optical micrographs were taken immediately after indentation, and the crack lengths were measured. The specimens were annealed at 900°C for either 30 min, 1 h, or 2 h. One group was indented and heat treated at 400°C for 2 h as control. The ratio of crack length after annealing to crack length before annealing treatment was calculated for each indentation. Scanning electron microscopy was performed before and after annealing at 900°C for 1 h. Scanning electron microscopy revealed shortening and blunting of the cracks after annealing. Annealing in air at 900°C for either 30 min, 1 or 2 h significantly reduced the mean crack length of an indented machinable dental ceramic compared to the control group. However, the mean biaxial flexural strength was not significantly affected by an annealing treatment. © 1999 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 48: 791–796, 1999</description><subject>Biological and medical sciences</subject><subject>Ceramics</subject><subject>crack healing</subject><subject>Dental Materials</subject><subject>Dental Restoration Wear</subject><subject>heat treatment</subject><subject>Hot Temperature</subject><subject>machinable dental ceramic</subject><subject>Medical sciences</subject><subject>Microscopy, Electron, Scanning</subject><subject>microstructure</subject><subject>Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)</subject><subject>Stress, Mechanical</subject><subject>Surface Properties</subject><subject>Technology. Biomaterials. Equipments. Material. 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A.</creator><general>John Wiley & Sons, Inc</general><general>John Wiley & Sons</general><scope>BSCLL</scope><scope>IQODW</scope><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>7SR</scope><scope>8FD</scope><scope>JG9</scope><scope>7X8</scope></search><sort><creationdate>1999</creationdate><title>Effect of heat treatment on microcrack healing behavior of a machinable dental ceramic</title><author>Denry, I. L. ; Holloway, J. A. ; Tarr, L. A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4555-19fe1702b4355666a9d116f2b9df3a770c16c0132044d914f765f8ae7abd1cbb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Biological and medical sciences</topic><topic>Ceramics</topic><topic>crack healing</topic><topic>Dental Materials</topic><topic>Dental Restoration Wear</topic><topic>heat treatment</topic><topic>Hot Temperature</topic><topic>machinable dental ceramic</topic><topic>Medical sciences</topic><topic>Microscopy, Electron, Scanning</topic><topic>microstructure</topic><topic>Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)</topic><topic>Stress, Mechanical</topic><topic>Surface Properties</topic><topic>Technology. Biomaterials. Equipments. Material. Instrumentation</topic><topic>X-Ray Diffraction</topic><toplevel>online_resources</toplevel><creatorcontrib>Denry, I. L.</creatorcontrib><creatorcontrib>Holloway, J. A.</creatorcontrib><creatorcontrib>Tarr, L. A.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of biomedical materials research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Denry, I. L.</au><au>Holloway, J. A.</au><au>Tarr, L. A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of heat treatment on microcrack healing behavior of a machinable dental ceramic</atitle><jtitle>Journal of biomedical materials research</jtitle><addtitle>J. Biomed. Mater. Res</addtitle><date>1999</date><risdate>1999</risdate><volume>48</volume><issue>6</issue><spage>791</spage><epage>796</epage><pages>791-796</pages><issn>0021-9304</issn><eissn>1097-4636</eissn><coden>JBMRBG</coden><abstract>The purpose of this study was to evaluate the effect of annealing in air on the crack healing behavior of a machinable dental ceramic (Vita Mark II). The glass transition temperature and the softening point were determined by dilatometry. Polished Vita Mark II blocks (n = 12) were indented with a Vickers indenter under a 9.8 N load. Optical micrographs were taken immediately after indentation, and the crack lengths were measured. The specimens were annealed at 900°C for either 30 min, 1 h, or 2 h. One group was indented and heat treated at 400°C for 2 h as control. The ratio of crack length after annealing to crack length before annealing treatment was calculated for each indentation. Scanning electron microscopy was performed before and after annealing at 900°C for 1 h. Scanning electron microscopy revealed shortening and blunting of the cracks after annealing. Annealing in air at 900°C for either 30 min, 1 or 2 h significantly reduced the mean crack length of an indented machinable dental ceramic compared to the control group. However, the mean biaxial flexural strength was not significantly affected by an annealing treatment. © 1999 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 48: 791–796, 1999</abstract><cop>New York</cop><pub>John Wiley & Sons, Inc</pub><pmid>10556842</pmid><doi>10.1002/(SICI)1097-4636(1999)48:6<791::AID-JBM5>3.0.CO;2-P</doi><tpages>6</tpages></addata></record> |
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subjects | Biological and medical sciences Ceramics crack healing Dental Materials Dental Restoration Wear heat treatment Hot Temperature machinable dental ceramic Medical sciences Microscopy, Electron, Scanning microstructure Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects) Stress, Mechanical Surface Properties Technology. Biomaterials. Equipments. Material. Instrumentation X-Ray Diffraction |
title | Effect of heat treatment on microcrack healing behavior of a machinable dental ceramic |
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