Evaluation of the thermal shrinkage of titanium and the setting and thermal expansion of phosphate-boded investments

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dc.contributor.authorFerreira, Anelise R.
dc.contributor.authorAdabo, Gelson Luis [UNESP]
dc.contributor.authorPeitl Filho, Oscar
dc.contributor.authorda Rocha, Sicknan Soares
dc.contributor.authorFonseca, Renata Garcia [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Federal de Goiás (UFG)
dc.date.accessioned2014-05-20T15:26:06Z
dc.date.available2014-05-20T15:26:06Z
dc.date.issued2007-07-01
dc.description.abstractStatement of problem. There are few studies on titanium casting shrinkage, and phosphate-bonded investments for titanium casting have not produced appropriate marginal fit.Purpose. The purpose of this study was to determine the thermal shrinkage of titanium and the setting and thermal expansion of 3 phosphate-bonded investments.Material and methods. The thermal shrinkage between the melting temperature and room temperature was calculated using a titanium thermal expansion coefficient. The thermal and setting expansion were measured for 3 phosphate bonded investments: Rematitan Plus (RP) specific for titanium, Rema Exakt (RE), and Castorit Super C (CA), using different special liquid concentrations (100%, 75%, and 50%). Setting expansion was measured for cylindrical specimens 50 mm long x 8 mm in diameter with a transducer. The heating and cooling curves were obtained with a dilatometer (DIL 402 PC). The total expansion curve was drawn using software, and temperatures to obtain expansion equivalent to titanium casting shrinkage were determined (n=5). In addition, the total expansion of the control group (RP at 430 degrees C) was measured, as well as the temperatures at which the other groups achieved equivalent total expansion (n=5). Data were analyzed by 1-way ANOVA and the Tukey HSD test (alpha=.05).Results. Titanium casting shrinkage was estimated as 1.55%. RP did not achieve this expansion. RE achieved expansion of 1.55% only with a special liquid concentration of 100% at 594 degrees C. CA with all special liquid concentrations attained this expansion (351 degrees C to 572 degrees C). Total expansion of the control group was 0.86%, and the other groups reached that expansion within the range of 70 degrees C to 360 degrees C.Conclusions. Only RE and CA demonstrated sufficient expansion to compensate for titanium casting shrinkage. All groups reached total expansion equivalent to that of the control group at significantly lower temperatures.en
dc.description.affiliationSão Paulo State Univ, Sch Dent, Dept Dent Mat & Prosthodont, Araraquara, SP, Brazil
dc.description.affiliationUniv Fed Sao Carlos, Dept Mat Engn, BR-13560 Sao Carlos, SP, Brazil
dc.description.affiliationGoias Fed Univ, Sch Dent, Dept Prevent & Oral Rehabil, Goiania, Go, Brazil
dc.description.affiliationUnespSão Paulo State Univ, Sch Dent, Dept Dent Mat & Prosthodont, Araraquara, SP, Brazil
dc.format.extent24-29
dc.identifierhttp://dx.doi.org/10.1016/S0022-3913(07)60034-1
dc.identifier.citationJournal of Prosthetic Dentistry. New York: Mosby-elsevier, v. 98, n. 1, p. 24-29, 2007.
dc.identifier.doi10.1016/S0022-3913(07)60034-1
dc.identifier.issn0022-3913
dc.identifier.lattes2851339311179809
dc.identifier.lattes3041561340615890
dc.identifier.urihttp://hdl.handle.net/11449/36333
dc.identifier.wosWOS:000248494700005
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Prosthetic Dentistry
dc.relation.ispartofjcr2.347
dc.relation.ispartofsjr1,087
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleEvaluation of the thermal shrinkage of titanium and the setting and thermal expansion of phosphate-boded investmentsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes2851339311179809
unesp.author.lattes3041561340615890
unesp.author.orcid0000-0002-0734-7926[2]
unesp.author.orcid0000-0001-6657-913X[5]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araraquarapt

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