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Article: Effect of burnout temperature on strength of gypsum-bonded investments

TitleEffect of burnout temperature on strength of gypsum-bonded investments
Authors
KeywordsBurnout temperature
Gypsum-bonded
Issue Date2003
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental
Citation
Dental Materials, 2003, v. 19 n. 6, p. 552-557 How to Cite?
AbstractObjective. To investigate the variation of the strength of gypsum-bonded dental investments with burnout temperature. Methods. The disc-rupture test was employed at burnout temperatures ranging from 450 to 800 °C for four products (Beauty Cast, Cristobalite, Novocast (all WhipMix) and Deguvest California (Degussa)). In this test, an investment disc is created inside an investment mold such that it forms a diaphragm across the mold space, being an integral part of the mold. Copper was cast into molds of this type, and whether the disc had ruptured or not was determined by inspection when cold. The amount of copper cast in successive tests was varied in staircase fashion up and down depending on whether the disc survived or failed. The strength of the investment was represented by the 50% point of the transition from survival to rupture. Results. The strength of gypsum-bonded investment is temperature sensitive, there being marked differences between the products tested. Overall, the strength ranking (temperature range average/MPa) was: Cristobalite (10.1) > Beauty Cast (7.8) > Novocast (5.1) > Deguvest California (3.4). The strength ranking at high temperatures differs from that known for the room temperature values. Significance. The use by manufacturers of room-temperature strength data conveys no information about high temperature behavior. Investment properties should be optimized by reference to behavior under casting conditions. © 2003 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/67117
ISSN
2015 Impact Factor: 3.931
2015 SCImago Journal Rankings: 1.339
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLuk, WKen_HK
dc.contributor.authorDarvell, BWen_HK
dc.date.accessioned2010-09-06T05:52:06Z-
dc.date.available2010-09-06T05:52:06Z-
dc.date.issued2003en_HK
dc.identifier.citationDental Materials, 2003, v. 19 n. 6, p. 552-557en_HK
dc.identifier.issn0109-5641en_HK
dc.identifier.urihttp://hdl.handle.net/10722/67117-
dc.description.abstractObjective. To investigate the variation of the strength of gypsum-bonded dental investments with burnout temperature. Methods. The disc-rupture test was employed at burnout temperatures ranging from 450 to 800 °C for four products (Beauty Cast, Cristobalite, Novocast (all WhipMix) and Deguvest California (Degussa)). In this test, an investment disc is created inside an investment mold such that it forms a diaphragm across the mold space, being an integral part of the mold. Copper was cast into molds of this type, and whether the disc had ruptured or not was determined by inspection when cold. The amount of copper cast in successive tests was varied in staircase fashion up and down depending on whether the disc survived or failed. The strength of the investment was represented by the 50% point of the transition from survival to rupture. Results. The strength of gypsum-bonded investment is temperature sensitive, there being marked differences between the products tested. Overall, the strength ranking (temperature range average/MPa) was: Cristobalite (10.1) > Beauty Cast (7.8) > Novocast (5.1) > Deguvest California (3.4). The strength ranking at high temperatures differs from that known for the room temperature values. Significance. The use by manufacturers of room-temperature strength data conveys no information about high temperature behavior. Investment properties should be optimized by reference to behavior under casting conditions. © 2003 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dentalen_HK
dc.relation.ispartofDental Materialsen_HK
dc.rightsDental Materials. Copyright © Elsevier Inc.en_HK
dc.subjectBurnout temperatureen_HK
dc.subjectGypsum-bondeden_HK
dc.subject.meshCalcium Sulfateen_HK
dc.subject.meshCopperen_HK
dc.subject.meshDental Casting Investmenten_HK
dc.subject.meshSilicon Dioxideen_HK
dc.subject.meshTemperatureen_HK
dc.titleEffect of burnout temperature on strength of gypsum-bonded investmentsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0109-5641&volume=19&spage=552&epage=557&date=2003&atitle=Effect+of+burnout+temperature+on+strength+of+gypsum-bonded+investmentsen_HK
dc.identifier.emailLuk, WK: wkluka@hkucc.hku.hken_HK
dc.identifier.emailDarvell, BW: b.w.darvell@hku.hken_HK
dc.identifier.authorityLuk, WK=rp00008en_HK
dc.identifier.authorityDarvell, BW=rp00007en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0109-5641(02)00104-5en_HK
dc.identifier.pmid12837404-
dc.identifier.scopuseid_2-s2.0-0041992459en_HK
dc.identifier.hkuros88814en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0041992459&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume19en_HK
dc.identifier.issue6en_HK
dc.identifier.spage552en_HK
dc.identifier.epage557en_HK
dc.identifier.isiWOS:000184044300014-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLuk, WK=7006636056en_HK
dc.identifier.scopusauthoridDarvell, BW=7005953926en_HK

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