Application ofporoustitaniuminprosthesis production usingamoldlessprocess:Evaluation of physicalandmechanicalpropertieswithvarious particle sizes,shapes,andmixingratios

Abstract

he prostheticapplicationsoftitaniumhavebeenchallengingbecausetitaniumdoesnot possess suitablepropertiesfortheconventionalcastingmethodusingthelostwax technique.Wehavedevelopedaproductionmethodforbiomedicalapplicationofporous titanium usingamoldlessprocess.Thisstudyaimedtoevaluatethephysicaland mechanical propertiesofporoustitaniumusingvariousparticlesizes,shapes,andmixing ratio oftitaniumpowdertowaxbinderforuseinprosthesisproduction.CPTipowders with differentparticlesizes,shapes,andmixingratiosweredividedinto five groups. A 90:10wt%mixtureoftitaniumpowderandwaxbinderwaspreparedmanuallyat70 1C. After debindingat380 1C, thespecimenwassinteredinArat1100 1C withoutamoldfor 1 h.Thelinearshrinkageratioofsinteredspecimensrangedfrom2.5%to14.2%.Thelinear shrinkage ratioincreasedwithdecreasingparticlesize.Whilethelinearshrinkageratioof Groups 3,4,and5wereapproximately2%,Group1showedthehighestshrinkageofall. The bendingstrengthrangedfrom106to428MPaundertheinfluence ofporosity.Groups 1 and2presentedlowporosityfollowedbyhigherstrength.Theshearbondstrength ranged from32to100MPa.Theshearbondstrengthwasalsoparticle-sizedependent.The decrease intheporosityincreasedthelinearshrinkageratioandbendingstrength. Shrinkage andmechanicalstrengthrequiredforprosthesesweredependentontheparticle size andshapeoftitaniumpowders.These findings suggestedthatthisproductionmethod can beappliedtotheprostheticframeworkbyselectingthematerialdesign.