SIST EN ISO 7490:2001

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Dental gypsum-bonded casting investments (ISO 7490:2000)Dentale gipsgebundene Einbettmassen (ISO 7490:2000)Revetements a couler dentaires a liant-plâtre (ISO 7490:2000)Dental gypsum-bonded casting investments (ISO 7490:2000)11.060.10Dental materialsICS:Ta slovenski standard je istoveten z:EN ISO 7490:2000SIST EN ISO 7490:2001en01-november-2001SIST EN ISO 7490:2001SLOVENSKI
STANDARDSIST EN 27490:20001DGRPHãþD



SIST EN ISO 7490:2001



SIST EN ISO 7490:2001



SIST EN ISO 7490:2001



ReferencenumberISO7490:2000(E)©ISO2000INTERNATIONALSTANDARDISO7490Secondedition2000-12-15Dentalgypsum-bondedcastinginvestmentsRevêtementsàcoulerdentairesàliant-plâtreSIST EN ISO 7490:2001



ISO7490:2000(E)PDFdisclaimerThisPDFfilemaycontainembeddedtypefaces.InaccordancewithAdobe'slicensingpolicy,thisfilemaybeprintedorviewedbutshallnotbeeditedunlessthetypefaceswhichareembeddedarelicensedtoandinstalledonthecomputerperformingtheediting.Indownloadingthisfile,partiesacceptthereintheresponsibilityofnotinfringingAdobe'slicensingpolicy.TheISOCentralSecretariatacceptsnoliabilityinthisarea.AdobeisatrademarkofAdobeSystemsIncorporated.DetailsofthesoftwareproductsusedtocreatethisPDFfilecanbefoundintheGeneralInforelativetothefile;thePDF-creationparameterswereoptimizedforprinting.EverycarehasbeentakentoensurethatthefileissuitableforusebyISOmemberbodies.Intheunlikelyeventthataproblemrelatingtoitisfound,pleaseinformtheCentralSecretariatattheaddressgivenbelow.©ISO2000Allrightsreserved.Unlessotherwisespecified,nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromeitherISOattheaddressbeloworISO'smemberbodyinthecountryoftherequester.ISOcopyrightofficeCasepostale56CH-1211Geneva20Tel.+41227490111Fax+41227490947E-mailcopyright@iso.chWebwww.iso.chPrintedinSwitzerlandii©ISO2000–AllrightsreservedSIST EN ISO 7490:2001



ISO7490:2000(E)©ISO2000–AllrightsreservediiiContentsPageForeword.ivIntroduction.v1Scope.12Termanddefinition.13Classification.14Requirements.14.1Appearanceofpowder.14.2Fluidityatworkingtime.14.3Settingtime.14.4Compressivestrength.24.5Linearsettingexpansion.24.6Linearthermalexpansion.25Sampling,testconditionsandmixing.25.1Sampling.25.2Testconditions.25.3Mixing.26Testmethods.36.1Visualexamination.36.2Fluidityatworktime.36.3Settingtime.36.4Compressivestrength.56.5Linearsettingexpansion.66.6Linearthermalexpansion.67Manufacturer'sinstructions.88Packaging.88.1Packaging.88.2Mouldlining.89Marking.8SIST EN ISO 7490:2001



ISO7490:2000(E)iv©ISO2000–AllrightsreservedForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part3.DraftInternationalStandardsadoptedbythetechnicalcommitteesarecirculatedtothememberbodiesforvoting.PublicationasanInternationalStandardrequiresapprovalbyatleast75%ofthememberbodiescastingavote.AttentionisdrawntothepossibilitythatsomeoftheelementsofthisInternationalStandardmaybethesubjectofpatentrights.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.InternationalStandardISO7490waspreparedbyTechnicalCommitteeISO/TC106,Dentistry,SubcommitteeSC2,Prosthodonticmaterials.Thissecondeditioncancelsandreplacesthefirstedition(ISO7490:1990),whichhasbeentechnicallyrevised.SIST EN ISO 7490:2001



ISO7490:2000(E)©ISO2000–AllrightsreservedvIntroductionTheoriginalnameofthisInternationalStandardwas“Dentalgypsum-bondedcastinginvestmentforgoldalloys”.Inthisrevisionthelimitationtogoldalloyshasbeenremovedandthetitlehasbeenchangedtoreflectthis.SIST EN ISO 7490:2001



SIST EN ISO 7490:2001



INTERNATIONALSTANDARDISO7490:2000(E)©ISO2000–Allrightsreserved1Dentalgypsum-bondedcastinginvestments1ScopeThisInternationalStandardestablishesaclassificationof,andspecifiesrequirementsfor,gypsum-bondedcastinginvestments.Italsospecifiestestmethodstobeusedtodeterminecompliancewiththeserequirements.2TermanddefinitionForthepurposesofthisInternationalStandard,thefollowingtermanddefinitionapplies.2.1dentalgypsum-bondedcastinginvestmentpowdermixtureofcalciumsulfatehemihydrateandsilicaand/orotherrefractorymaterialsNOTEThepowdermayalsocontainsmallquantitiesofmodifyingagents.3ClassificationDentalgypsum-bondedcastinginvestmentsareclassifiedasfollows:Type1:Forcastinginlaysandcrowns.Type2:Forcastingcompleteandpartialdenturebases.Initsclassification,aparticularmaterialneednotberestrictedtoonlyonetype.4Requirements4.1AppearanceofpowderWhenexaminedvisually(6.1),thepowdershallbeofuniformappearanceandfreefromforeignmatterandlumps.4.2FluidityatworkingtimeWhentestedinaccordancewith6.2,thediameterofthesetmaterialshallbeatleast60mmforType1and40mmforType2materials.4.3SettingtimeWhentestedinaccordancewith6.3,theVicattimeshallnotvarybymorethan20%fromthemanufacturer’sclaimedsettingtime.Ifthemanufacturerclaimsarange,thenthesettingtimeshallnotvarybymorethan20%fromthemidpointofthisrange.SIST EN ISO 7490:2001



ISO7490:2000(E)2©ISO2000–Allrightsreserved4.4CompressivestrengthWhentestedinaccordancewith6.4,Type1materialsshallhaveaminimumcompressivestrengthof2,3MPaandType2materialsshallhaveaminimumcompressivestrengthof2,6MPa.4.5LinearsettingexpansionWhendeterminedinaccordancewith6.5,thelinearsettingexpansionshallnotdifferbymorethan20%fromthevalueclaimedbythemanufacturer.Ifthemanufacturerclaimsarangethenthevaluedeterminedshallnotdifferfromthemidpointofthisrangebymorethan20%.4.6LinearthermalexpansionWhendeterminedinaccordancewith6.6,thelinearthermalexpansionofthematerialshallnotdifferbymorethan20%fromthevalueclaimedbythemanufacturer.Ifthemanufacturerclaimsarangethenthevaluedeterminedshallnotdifferfromthemidpointofthisrangebymorethan20%.5Sampling,testconditionsandmixing5.1SamplingSufficientretailpackagesofthematerialofonebatchshallbeobtainedtoprovideatleast5kgofmaterial.Anypackagesthatarenotsealedshallbediscarded.Whenthepowderissuppliedinbulk,itshallbethoroughlyblendedandstoredinamoisture-proofcontainerpriortotesting.5.2TestconditionsAlltestingoftheinvestmentshallbecarriedoutat(232)Cand(5010)%relativehumidityandinaroomfreefromobviousdrafts.Alltestequipmentshallbecleananddry.Thebowlsusedformixingshallbeclean,shallbemoistenedandexcesswatershallbeshakenoff.Beforetestingbegins,equipmentandmaterialshallbeallowedtoequilibratewiththespecifiedtesttemperatureandhumidityatleastfor5hto6h.Somecomponentsofthemixingandtestingequipmentarecleanedbetweentests.Theseitemsshouldbeallowedtoreturntothespecifiedtesttemperaturebeforebeingreused.5.3Mixing5.3.1Apparatus5.3.1.1Cleanapparatusformixingasrecommendedbythemanufacturerintheinstructions[item7d)].5.3.1.2Timingdevicesuchasastopwatch.5.3.2ProcedureMeasure,toanaccuracyof1%,300gofpowderandtherequiredvolumeofwaterasgivenbythemanufacturer’sinstructionsinaccordancewithitem7c).Ifthemanufacturerspecifiesarangeofvolumeforthewater,usethemidpointoftherange.Pourthewaterintothemixingbowlandsifttheinvestmentpowderintothewaterwithin10s,minimizingentrapmentofair.Begintimingfromthemomenttheinvestmentpowderandthewaterfirstmakecontact.Handspatulatefor15sataspeedofabouttwot
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