Designation:E2466−13StandardTestMethodforColorimetryofTeethUsingDigitalStillCameraTechnology1ThisstandardisissuedunderthefixeddesignationE2466;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONToothcolorisanimportantparameterusedtoascertaincertainmedicalandestheticinformation.CIEcolorimetricvaluesfortheteetharederivedfromthenativeRGBsignalsgeneratedbyadigitalstillcamera,DSC,bybroadbandmeasurementofthereflectanceofteeth.Theilluminationangleis45degreesandCIELABcolorimetriccoordinatesarecomputedusingequationscontainedinPracticeE308.Thistestmethod,E2466,specifiestheprocedureusedforthemeasurementoftoothcolorin-vivoandin-vitrowithilluminationat45degreesrelativetothesampleplanewhichisalsothenormalofthemouth,underanapproximateequalenergyspectrum.Thistestmethodisappropriateforanteriorandposteriorteeth.1.Scope1.1Thistestmethodcoverstheprocedure,instrumentalrequirements,standardizationprocedures,materialstandards,measurementprocedures,andparametersnecessarytomakeprecisemeasurementsofin-vivotoothcolorandtoothwhite-ness.Inparticularitismeanttomeasurethecolorofteethinselectedhumansubjects.1.2Digitalimagesareusedtoevaluatetoothcolorofbothposteriorandanteriordentition(teeth).Allothernon-relevantparts,suchasgums,spaces,etc.,mustbeseparatedfromthemeasurementandtheanalysis.Alllocalizeddiscoloration;suchasstains,inclusions,etc.,maybeseparatedfromthemeasure-mentandtheanalysis.1.3Thebroadbandreflectancefactorsofteetharemeasured.Thecolorimetricmeasurementisperformedwithadigitalstillcamerawhileusinganilluminator(s)thatprovidescontrolledilluminationontheteeth.ThemeasureddatafromadigitalimagearecapturedusingaDSC.Thistestmethodisparticu-larlyusefulforthegamutoftoothcolorwhichis:1.3.1CIEL*from55to95,1.3.2CIEa*from3to12,1.3.3CIEb*from8to25units.1.4Thewavelengthsforthistestmet...
