Effect of burn-out temperature on magnetic keepers in cast noble metal alloy posts
Statement of problem Early loss of magnetic keepers in cast gold posts is seen in clinical practice. Purpose The purpose of this vitro study was to investigate the effect of burn-out temperature on the retention of magnetic keepers in cast gold alloy and on the thickness of the oxide layer at the ke...
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| Veröffentlicht in: | The Journal of prosthetic dentistry 2009, Vol.101 (1), p.66-72 |
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| container_title | The Journal of prosthetic dentistry |
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| creator | Pow, Edmond H.N., BDS, MDS, PhD Chan, Kingsley H.C., BDS, MDS Luk, Henry W.K., MPhil, PhD Dias, Andrew P.L.H., BDS, MDS, MPhil McMillan, Anne S., BDS, PhD |
| description | Statement of problem Early loss of magnetic keepers in cast gold posts is seen in clinical practice. Purpose The purpose of this vitro study was to investigate the effect of burn-out temperature on the retention of magnetic keepers in cast gold alloy and on the thickness of the oxide layer at the keeper-alloy interface. Material and methods One hundred and five keepers (Magfit EX) were cast with gold alloy (Protor 3) at 3 different burn-out temperatures: 500°C, 600°C, or 700°C (n=35). To test for retention of keepers, 60 specimens (n=20) were tested to failure in tension mode in a universal testing machine (UTM); 45 specimens (n=15) were sectioned, and the interface was evaluated under a scanning electron microscope (SEM). Tensile force data were analyzed with 1-way ANOVA, and SEM data were analyzed with 1-way repeated measures ANOVA. Bonferroni multiple comparisons were performed for post hoc analysis (α=.05). Results Retention of the keepers was significantly higher at lower burn-out temperatures ( P |
| doi_str_mv | 10.1016/S0022-3913(08)60293-0 |
| format | Article |
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Purpose The purpose of this vitro study was to investigate the effect of burn-out temperature on the retention of magnetic keepers in cast gold alloy and on the thickness of the oxide layer at the keeper-alloy interface. Material and methods One hundred and five keepers (Magfit EX) were cast with gold alloy (Protor 3) at 3 different burn-out temperatures: 500°C, 600°C, or 700°C (n=35). To test for retention of keepers, 60 specimens (n=20) were tested to failure in tension mode in a universal testing machine (UTM); 45 specimens (n=15) were sectioned, and the interface was evaluated under a scanning electron microscope (SEM). Tensile force data were analyzed with 1-way ANOVA, and SEM data were analyzed with 1-way repeated measures ANOVA. Bonferroni multiple comparisons were performed for post hoc analysis (α=.05). Results Retention of the keepers was significantly higher at lower burn-out temperatures ( P <.001). The retention of the keepers became unpredictable and immediate failures were observed at a burn-out temperature of 700°C. Oxide formation at the keeper-alloy interface was significantly less at lower burn-out temperatures ( P <.001). Conclusions A burn-out temperature of 500°C for casting the Magfit EX keeper with type IV high-strength gold alloy is recommended. (J Prosthet Dent 2009;101:66-72)</description><identifier>ISSN: 0022-3913</identifier><identifier>EISSN: 1097-6841</identifier><identifier>DOI: 10.1016/S0022-3913(08)60293-0</identifier><identifier>PMID: 19105993</identifier><language>eng</language><publisher>United States: Mosby, Inc</publisher><subject>Calcium Sulfate ; Dental Alloys ; Dental Casting Investment ; Dental Casting Technique ; Dental Restoration Failure ; Dental Stress Analysis ; Dentistry ; Denture Retention - instrumentation ; Denture, Overlay ; Gold Alloys - chemistry ; Hot Temperature ; Magnetics - instrumentation ; Oxides ; Post and Core Technique ; Stainless Steel ; Tensile Strength</subject><ispartof>The Journal of prosthetic dentistry, 2009, Vol.101 (1), p.66-72</ispartof><rights>The Editorial Council of the Journal of Prosthetic Dentistry</rights><rights>2009 The Editorial Council of the Journal of Prosthetic Dentistry</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c418t-4550d040b52ae65230b18f3a49f7535b524eb189187b0d99f8cc6503253c40e73</citedby><cites>FETCH-LOGICAL-c418t-4550d040b52ae65230b18f3a49f7535b524eb189187b0d99f8cc6503253c40e73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/S0022-3913(08)60293-0$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,4024,27923,27924,27925,45995</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/19105993$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Pow, Edmond H.N., BDS, MDS, PhD</creatorcontrib><creatorcontrib>Chan, Kingsley H.C., BDS, MDS</creatorcontrib><creatorcontrib>Luk, Henry W.K., MPhil, PhD</creatorcontrib><creatorcontrib>Dias, Andrew P.L.H., BDS, MDS, MPhil</creatorcontrib><creatorcontrib>McMillan, Anne S., BDS, PhD</creatorcontrib><title>Effect of burn-out temperature on magnetic keepers in cast noble metal alloy posts</title><title>The Journal of prosthetic dentistry</title><addtitle>J Prosthet Dent</addtitle><description>Statement of problem Early loss of magnetic keepers in cast gold posts is seen in clinical practice. Purpose The purpose of this vitro study was to investigate the effect of burn-out temperature on the retention of magnetic keepers in cast gold alloy and on the thickness of the oxide layer at the keeper-alloy interface. Material and methods One hundred and five keepers (Magfit EX) were cast with gold alloy (Protor 3) at 3 different burn-out temperatures: 500°C, 600°C, or 700°C (n=35). To test for retention of keepers, 60 specimens (n=20) were tested to failure in tension mode in a universal testing machine (UTM); 45 specimens (n=15) were sectioned, and the interface was evaluated under a scanning electron microscope (SEM). Tensile force data were analyzed with 1-way ANOVA, and SEM data were analyzed with 1-way repeated measures ANOVA. Bonferroni multiple comparisons were performed for post hoc analysis (α=.05). Results Retention of the keepers was significantly higher at lower burn-out temperatures ( P <.001). The retention of the keepers became unpredictable and immediate failures were observed at a burn-out temperature of 700°C. Oxide formation at the keeper-alloy interface was significantly less at lower burn-out temperatures ( P <.001). Conclusions A burn-out temperature of 500°C for casting the Magfit EX keeper with type IV high-strength gold alloy is recommended. (J Prosthet Dent 2009;101:66-72)</description><subject>Calcium Sulfate</subject><subject>Dental Alloys</subject><subject>Dental Casting Investment</subject><subject>Dental Casting Technique</subject><subject>Dental Restoration Failure</subject><subject>Dental Stress Analysis</subject><subject>Dentistry</subject><subject>Denture Retention - instrumentation</subject><subject>Denture, Overlay</subject><subject>Gold Alloys - chemistry</subject><subject>Hot Temperature</subject><subject>Magnetics - instrumentation</subject><subject>Oxides</subject><subject>Post and Core Technique</subject><subject>Stainless Steel</subject><subject>Tensile Strength</subject><issn>0022-3913</issn><issn>1097-6841</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkc1q3TAQhUVpaG7TPkKLVqVdOB1Zli1tUkpIk0Ag0J-1kOVxUSJbN5IcuG9f3R8ayCYrweHMN-gbQj4wOGXA2q-_AOq64orxzyC_tFArXsErsmKguqqVDXtNVv8rx-RtSncAIEXH3pBjphgIpfiK_LwYR7SZhpH2S5yrsGSacVpjNHmJSMNMJ_N3xuwsvUcseaJuptakTOfQe6QTZuOp8T5s6DqknN6Ro9H4hO8P7wn58-Pi9_lVdXN7eX3-_aayDZO5aoSAARroRW2wFTWHnsmRm0aNneCixA2WRDHZ9TAoNUprWwG8Ftw2gB0_IZ_23HUMDwumrCeXLHpvZgxL0m1bOLWEUhT7oo0hpYijXkc3mbjRDPRWpt7J1FtTGqTeydTbuY-HBUs_4fA0dbBXCt_2BSzffHQYdbIOZ4uDi0WqHoJ7ccXZM4L1bnbW-HvcYLoL5SbFoWY61Rr2kC0D5I4A_B-Ld5dr</recordid><startdate>2009</startdate><enddate>2009</enddate><creator>Pow, Edmond H.N., BDS, MDS, PhD</creator><creator>Chan, Kingsley H.C., BDS, MDS</creator><creator>Luk, Henry W.K., MPhil, PhD</creator><creator>Dias, Andrew P.L.H., BDS, MDS, MPhil</creator><creator>McMillan, Anne S., BDS, PhD</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>2009</creationdate><title>Effect of burn-out temperature on magnetic keepers in cast noble metal alloy posts</title><author>Pow, Edmond H.N., BDS, MDS, PhD ; Chan, Kingsley H.C., BDS, MDS ; Luk, Henry W.K., MPhil, PhD ; Dias, Andrew P.L.H., BDS, MDS, MPhil ; McMillan, Anne S., BDS, PhD</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c418t-4550d040b52ae65230b18f3a49f7535b524eb189187b0d99f8cc6503253c40e73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Calcium Sulfate</topic><topic>Dental Alloys</topic><topic>Dental Casting Investment</topic><topic>Dental Casting Technique</topic><topic>Dental Restoration Failure</topic><topic>Dental Stress Analysis</topic><topic>Dentistry</topic><topic>Denture Retention - instrumentation</topic><topic>Denture, Overlay</topic><topic>Gold Alloys - chemistry</topic><topic>Hot Temperature</topic><topic>Magnetics - instrumentation</topic><topic>Oxides</topic><topic>Post and Core Technique</topic><topic>Stainless Steel</topic><topic>Tensile Strength</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Pow, Edmond H.N., BDS, MDS, PhD</creatorcontrib><creatorcontrib>Chan, Kingsley H.C., BDS, MDS</creatorcontrib><creatorcontrib>Luk, Henry W.K., MPhil, PhD</creatorcontrib><creatorcontrib>Dias, Andrew P.L.H., BDS, MDS, MPhil</creatorcontrib><creatorcontrib>McMillan, Anne S., BDS, PhD</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>Pow, Edmond H.N., BDS, MDS, PhD</au><au>Chan, Kingsley H.C., BDS, MDS</au><au>Luk, Henry W.K., MPhil, PhD</au><au>Dias, Andrew P.L.H., BDS, MDS, MPhil</au><au>McMillan, Anne S., BDS, PhD</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of burn-out temperature on magnetic keepers in cast noble metal alloy posts</atitle><jtitle>The Journal of prosthetic dentistry</jtitle><addtitle>J Prosthet Dent</addtitle><date>2009</date><risdate>2009</risdate><volume>101</volume><issue>1</issue><spage>66</spage><epage>72</epage><pages>66-72</pages><issn>0022-3913</issn><eissn>1097-6841</eissn><abstract>Statement of problem Early loss of magnetic keepers in cast gold posts is seen in clinical practice. Purpose The purpose of this vitro study was to investigate the effect of burn-out temperature on the retention of magnetic keepers in cast gold alloy and on the thickness of the oxide layer at the keeper-alloy interface. Material and methods One hundred and five keepers (Magfit EX) were cast with gold alloy (Protor 3) at 3 different burn-out temperatures: 500°C, 600°C, or 700°C (n=35). To test for retention of keepers, 60 specimens (n=20) were tested to failure in tension mode in a universal testing machine (UTM); 45 specimens (n=15) were sectioned, and the interface was evaluated under a scanning electron microscope (SEM). Tensile force data were analyzed with 1-way ANOVA, and SEM data were analyzed with 1-way repeated measures ANOVA. Bonferroni multiple comparisons were performed for post hoc analysis (α=.05). Results Retention of the keepers was significantly higher at lower burn-out temperatures ( P <.001). The retention of the keepers became unpredictable and immediate failures were observed at a burn-out temperature of 700°C. Oxide formation at the keeper-alloy interface was significantly less at lower burn-out temperatures ( P <.001). Conclusions A burn-out temperature of 500°C for casting the Magfit EX keeper with type IV high-strength gold alloy is recommended. (J Prosthet Dent 2009;101:66-72)</abstract><cop>United States</cop><pub>Mosby, Inc</pub><pmid>19105993</pmid><doi>10.1016/S0022-3913(08)60293-0</doi><tpages>7</tpages></addata></record> |
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| source | MEDLINE; Elsevier ScienceDirect Journals Complete |
| subjects | Calcium Sulfate Dental Alloys Dental Casting Investment Dental Casting Technique Dental Restoration Failure Dental Stress Analysis Dentistry Denture Retention - instrumentation Denture, Overlay Gold Alloys - chemistry Hot Temperature Magnetics - instrumentation Oxides Post and Core Technique Stainless Steel Tensile Strength |
| title | Effect of burn-out temperature on magnetic keepers in cast noble metal alloy posts |
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