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.
