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
Hauptverfasser: Denry, I. L., Holloway, J. A., Tarr, L. A.
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Holloway, J. A.
Tarr, L. A.
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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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 &amp; Sons, Inc. 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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 &amp; 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 &amp; Sons, Inc</general><general>John Wiley &amp; 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. 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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 &amp; Sons, Inc. J Biomed Mater Res (Appl Biomater) 48: 791–796, 1999</abstract><cop>New York</cop><pub>John Wiley &amp; Sons, Inc</pub><pmid>10556842</pmid><doi>10.1002/(SICI)1097-4636(1999)48:6&lt;791::AID-JBM5&gt;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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