Machinability of lithium disilicate glass ceramic in in vitro dental diamond bur adjusting process
Esthetic high-strength lithium disilicate glass ceramics (LDGC) are used for monolithic crowns and bridges produced in dental CAD/CAM and oral adjusting processes, which machinability affects the restorative quality. A machinability study has been made in the simulated oral clinical machining of LDG...
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| Veröffentlicht in: | Journal of the mechanical behavior of biomedical materials 2016-01, Vol.53, p.78-92 |
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| creator | Song, Xiao-Fei Ren, Hai-Tao Yin, Ling |
| description | Esthetic high-strength lithium disilicate glass ceramics (LDGC) are used for monolithic crowns and bridges produced in dental CAD/CAM and oral adjusting processes, which machinability affects the restorative quality. A machinability study has been made in the simulated oral clinical machining of LDGC with a dental handpiece and diamond burs, regarding the diamond tool wear and chip control, machining forces and energy, surface finish and integrity. Machining forces, speeds and energy in in vitro dental adjusting of LDGC were measured by a high-speed data acquisition and force sensor system. Machined LDGC surfaces were assessed using three-dimensional non-contact chromatic confocal optical profilometry and scanning electron microscopy (SEM). Diamond bur morphology and LDGC chip shapes were also examined using SEM. Minimum tool wear but significant LDGC chip accumulations were found. Machining forces and energy significantly depended on machining conditions (p |
| doi_str_mv | 10.1016/j.jmbbm.2015.08.003 |
| format | Article |
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A machinability study has been made in the simulated oral clinical machining of LDGC with a dental handpiece and diamond burs, regarding the diamond tool wear and chip control, machining forces and energy, surface finish and integrity. Machining forces, speeds and energy in in vitro dental adjusting of LDGC were measured by a high-speed data acquisition and force sensor system. Machined LDGC surfaces were assessed using three-dimensional non-contact chromatic confocal optical profilometry and scanning electron microscopy (SEM). Diamond bur morphology and LDGC chip shapes were also examined using SEM. Minimum tool wear but significant LDGC chip accumulations were found. Machining forces and energy significantly depended on machining conditions (p<0.05) and were significantly higher than other glass ceramics (p<0.05). Machining speeds dropped more rapidly with increased removal rates than other glass ceramics (p<0.05). Two material machinability indices associated with the hardness, Young’s modulus and fracture toughness were derived based on the normal force-removal rate relations, which ranked LDGC the most difficult to machine among glass ceramics. Surface roughness for machined LDGC was comparable for other glass ceramics. The removal mechanisms of LDGC were dominated by penetration-induced brittle fracture and shear-induced plastic deformation. Unlike most other glass ceramics, distinct intergranular and transgranular fractures of lithium disilicate crystals were found in LDGC. This research provides the fundamental data for dental clinicians on the machinability of LDGC in intraoral adjustments.</description><identifier>ISSN: 1751-6161</identifier><identifier>EISSN: 1878-0180</identifier><identifier>DOI: 10.1016/j.jmbbm.2015.08.003</identifier><identifier>PMID: 26318569</identifier><language>eng</language><publisher>Netherlands: Elsevier Ltd</publisher><subject>Ceramics - chemistry ; Dental adjusting ; Dental Equipment ; Dental Porcelain - chemistry ; Diamond ; Forces ; Lithium disilicate glass ceramic (LDGC) ; Machinability ; Specific machining energy ; Surface Properties ; Surface roughness and integrity ; Time Factors</subject><ispartof>Journal of the mechanical behavior of biomedical materials, 2016-01, Vol.53, p.78-92</ispartof><rights>2015 Elsevier Ltd</rights><rights>Copyright © 2015 Elsevier Ltd. All rights reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c425t-30e5db834ba90cae255afa1cd49254da7f7ad4105f5f7deb3dcd662f29132ab73</citedby><cites>FETCH-LOGICAL-c425t-30e5db834ba90cae255afa1cd49254da7f7ad4105f5f7deb3dcd662f29132ab73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S175161611500274X$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3536,27903,27904,65309</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/26318569$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Song, Xiao-Fei</creatorcontrib><creatorcontrib>Ren, Hai-Tao</creatorcontrib><creatorcontrib>Yin, Ling</creatorcontrib><title>Machinability of lithium disilicate glass ceramic in in vitro dental diamond bur adjusting process</title><title>Journal of the mechanical behavior of biomedical materials</title><addtitle>J Mech Behav Biomed Mater</addtitle><description>Esthetic high-strength lithium disilicate glass ceramics (LDGC) are used for monolithic crowns and bridges produced in dental CAD/CAM and oral adjusting processes, which machinability affects the restorative quality. A machinability study has been made in the simulated oral clinical machining of LDGC with a dental handpiece and diamond burs, regarding the diamond tool wear and chip control, machining forces and energy, surface finish and integrity. Machining forces, speeds and energy in in vitro dental adjusting of LDGC were measured by a high-speed data acquisition and force sensor system. Machined LDGC surfaces were assessed using three-dimensional non-contact chromatic confocal optical profilometry and scanning electron microscopy (SEM). Diamond bur morphology and LDGC chip shapes were also examined using SEM. Minimum tool wear but significant LDGC chip accumulations were found. Machining forces and energy significantly depended on machining conditions (p<0.05) and were significantly higher than other glass ceramics (p<0.05). Machining speeds dropped more rapidly with increased removal rates than other glass ceramics (p<0.05). Two material machinability indices associated with the hardness, Young’s modulus and fracture toughness were derived based on the normal force-removal rate relations, which ranked LDGC the most difficult to machine among glass ceramics. Surface roughness for machined LDGC was comparable for other glass ceramics. The removal mechanisms of LDGC were dominated by penetration-induced brittle fracture and shear-induced plastic deformation. Unlike most other glass ceramics, distinct intergranular and transgranular fractures of lithium disilicate crystals were found in LDGC. This research provides the fundamental data for dental clinicians on the machinability of LDGC in intraoral adjustments.</description><subject>Ceramics - chemistry</subject><subject>Dental adjusting</subject><subject>Dental Equipment</subject><subject>Dental Porcelain - chemistry</subject><subject>Diamond</subject><subject>Forces</subject><subject>Lithium disilicate glass ceramic (LDGC)</subject><subject>Machinability</subject><subject>Specific machining energy</subject><subject>Surface Properties</subject><subject>Surface roughness and integrity</subject><subject>Time Factors</subject><issn>1751-6161</issn><issn>1878-0180</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kE1rFzEQh4NY7It-AkFy9LLrZLPJZg8epKgVKl7ac5gks22WfanJbqHfvvn7rx6FwIThmfkxD2PvBdQChP401uPs3Fw3IFQNpgaQr9iZMJ2pQBh4Xf6dEpUWWpyy85xHAA1gzBt22mgpjNL9GXM_0d_HBV2c4vbE14GXeh_3mYeYS8_jRvxuwpy5p4Rz9Dwuh_cYt7TyQMuGU2FxXpfA3Z44hnHPW1zu-ENaPeX8lp0MOGV691Iv2O23rzeXV9X1r-8_Lr9cV75t1FZJIBWcka3DHjxSoxQOKHxo-0a1Abuhw9AKUIMaukBOBh-0boamF7JB18kL9vG4t-T-3ilvdo7Z0zThQuuereikFD0orQsqj6hPa86JBvuQ4ozpyQqwB7l2tH_k2oNcC8YWuWXqw0vA7mYK_2b-2izA5yNA5czHSMlmH2nxFGIiv9mwxv8GPAPRO43J</recordid><startdate>201601</startdate><enddate>201601</enddate><creator>Song, Xiao-Fei</creator><creator>Ren, Hai-Tao</creator><creator>Yin, Ling</creator><general>Elsevier Ltd</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>201601</creationdate><title>Machinability of lithium disilicate glass ceramic in in vitro dental diamond bur adjusting process</title><author>Song, Xiao-Fei ; Ren, Hai-Tao ; Yin, Ling</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c425t-30e5db834ba90cae255afa1cd49254da7f7ad4105f5f7deb3dcd662f29132ab73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Ceramics - chemistry</topic><topic>Dental adjusting</topic><topic>Dental Equipment</topic><topic>Dental Porcelain - chemistry</topic><topic>Diamond</topic><topic>Forces</topic><topic>Lithium disilicate glass ceramic (LDGC)</topic><topic>Machinability</topic><topic>Specific machining energy</topic><topic>Surface Properties</topic><topic>Surface roughness and integrity</topic><topic>Time Factors</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Song, Xiao-Fei</creatorcontrib><creatorcontrib>Ren, Hai-Tao</creatorcontrib><creatorcontrib>Yin, Ling</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>Journal of the mechanical behavior of biomedical materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Song, Xiao-Fei</au><au>Ren, Hai-Tao</au><au>Yin, Ling</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Machinability of lithium disilicate glass ceramic in in vitro dental diamond bur adjusting process</atitle><jtitle>Journal of the mechanical behavior of biomedical materials</jtitle><addtitle>J Mech Behav Biomed Mater</addtitle><date>2016-01</date><risdate>2016</risdate><volume>53</volume><spage>78</spage><epage>92</epage><pages>78-92</pages><issn>1751-6161</issn><eissn>1878-0180</eissn><abstract>Esthetic high-strength lithium disilicate glass ceramics (LDGC) are used for monolithic crowns and bridges produced in dental CAD/CAM and oral adjusting processes, which machinability affects the restorative quality. A machinability study has been made in the simulated oral clinical machining of LDGC with a dental handpiece and diamond burs, regarding the diamond tool wear and chip control, machining forces and energy, surface finish and integrity. Machining forces, speeds and energy in in vitro dental adjusting of LDGC were measured by a high-speed data acquisition and force sensor system. Machined LDGC surfaces were assessed using three-dimensional non-contact chromatic confocal optical profilometry and scanning electron microscopy (SEM). Diamond bur morphology and LDGC chip shapes were also examined using SEM. Minimum tool wear but significant LDGC chip accumulations were found. Machining forces and energy significantly depended on machining conditions (p<0.05) and were significantly higher than other glass ceramics (p<0.05). Machining speeds dropped more rapidly with increased removal rates than other glass ceramics (p<0.05). Two material machinability indices associated with the hardness, Young’s modulus and fracture toughness were derived based on the normal force-removal rate relations, which ranked LDGC the most difficult to machine among glass ceramics. Surface roughness for machined LDGC was comparable for other glass ceramics. The removal mechanisms of LDGC were dominated by penetration-induced brittle fracture and shear-induced plastic deformation. Unlike most other glass ceramics, distinct intergranular and transgranular fractures of lithium disilicate crystals were found in LDGC. This research provides the fundamental data for dental clinicians on the machinability of LDGC in intraoral adjustments.</abstract><cop>Netherlands</cop><pub>Elsevier Ltd</pub><pmid>26318569</pmid><doi>10.1016/j.jmbbm.2015.08.003</doi><tpages>15</tpages></addata></record> |
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| source | MEDLINE; Elsevier ScienceDirect Journals |
| subjects | Ceramics - chemistry Dental adjusting Dental Equipment Dental Porcelain - chemistry Diamond Forces Lithium disilicate glass ceramic (LDGC) Machinability Specific machining energy Surface Properties Surface roughness and integrity Time Factors |
| title | Machinability of lithium disilicate glass ceramic in in vitro dental diamond bur adjusting process |
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