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Article: A new method for casting discrepancy: some results for a phosphate-bonded investment

TitleA new method for casting discrepancy: some results for a phosphate-bonded investment
Authors
KeywordsCasting
Investment
Phosphate-bonded
Accuracy
Issue Date1998
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdent
Citation
Journal of Dentistry, 1998, v. 26 n. 1, p. 59-68 How to Cite?
AbstractObjectives: An accurate and realistic casting discrepancy method applicable to base metal alloys has hitherto been lacking. The purpose of this study was to develop a method for determining casting discrepancy free of interference from oxide, slag and surface defects, working under realistic conditions. In addition, a variable was sought that could be used for calibrating the casting process to allow for local errors. Methods: A crown pattern was designed to incorporate circular V-grooves on the margin and the inside surface of the occlusal part for determination of the ‘groove root diameter’ (GRD) with a measuring microscope. Castings using a phosphate-bonded investment were made to test the effects of ‘hygroscopic’ expansion, burn-out temperature, powder/liquid ratio and groove location. Results: The tested investment variables showed the expected effects, but the distortion between marginal and pulpal regions was clearly shown, as were interactions between some variables. ‘Special liquid’ proportion appears to be a good candidate variable for process calibration. Conclusions: The GRD method was shown to be sensitive and reproducible. It is also applicable to many other casting systems, and in particular to monitoring overall process discrepancy, i.e. from tooth preparation to casting, which is suggested as being the key issue.
Persistent Identifierhttp://hdl.handle.net/10722/222200
ISSN
2015 Impact Factor: 3.109
2015 SCImago Journal Rankings: 1.029

 

DC FieldValueLanguage
dc.contributor.authorHo, EKH-
dc.contributor.authorDarvell, BW-
dc.date.accessioned2016-01-04T02:14:08Z-
dc.date.available2016-01-04T02:14:08Z-
dc.date.issued1998-
dc.identifier.citationJournal of Dentistry, 1998, v. 26 n. 1, p. 59-68-
dc.identifier.issn0300-5712-
dc.identifier.urihttp://hdl.handle.net/10722/222200-
dc.description.abstractObjectives: An accurate and realistic casting discrepancy method applicable to base metal alloys has hitherto been lacking. The purpose of this study was to develop a method for determining casting discrepancy free of interference from oxide, slag and surface defects, working under realistic conditions. In addition, a variable was sought that could be used for calibrating the casting process to allow for local errors. Methods: A crown pattern was designed to incorporate circular V-grooves on the margin and the inside surface of the occlusal part for determination of the ‘groove root diameter’ (GRD) with a measuring microscope. Castings using a phosphate-bonded investment were made to test the effects of ‘hygroscopic’ expansion, burn-out temperature, powder/liquid ratio and groove location. Results: The tested investment variables showed the expected effects, but the distortion between marginal and pulpal regions was clearly shown, as were interactions between some variables. ‘Special liquid’ proportion appears to be a good candidate variable for process calibration. Conclusions: The GRD method was shown to be sensitive and reproducible. It is also applicable to many other casting systems, and in particular to monitoring overall process discrepancy, i.e. from tooth preparation to casting, which is suggested as being the key issue.-
dc.languageeng-
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdent-
dc.relation.ispartofJournal of Dentistry-
dc.rights© <year>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/-
dc.subjectCasting-
dc.subjectInvestment-
dc.subjectPhosphate-bonded-
dc.subjectAccuracy-
dc.titleA new method for casting discrepancy: some results for a phosphate-bonded investment-
dc.typeArticle-
dc.identifier.emailDarvell, BW: hrdubwd@hkucc.hku.hk-
dc.identifier.authorityDarvell, BW=rp00007-
dc.identifier.doi10.1016/S0300-5712(96)00071-1-
dc.identifier.hkuros31469-
dc.identifier.volume26-
dc.identifier.issue1-
dc.identifier.spage59-
dc.identifier.epage68-
dc.publisher.placeUnited Kingdom-

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