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Biomechanical evaluation of porous titanium implants (CpTi) fabricated by powder technology

Authors: Dhuha Hussein Mohammed ضحى حسين محمد --- Widad A. H. Alnakkash وداد عبد الهادي النقاش
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 1 Pages: 18-25
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: It may be an important prospective clinical use of manufacturing of porous implant for clinicalsituations, such as cases of limitation in bone height, low bone density .The small segment of porous implant aneffective osseointegration allows increasing in contact area provided for small segmented porous provided by itssurface configuration. This study was done to Fabricate porous titanium implants by powder technology, as well asthe observation of removal torque values of porous titanium implants compared to smooth titanium implants.Materials and methods: Twenty porous titanium implants (3.2mm in diameter and 8mm in length) were manufacturedby powder technology using commercially pure titanium powder of ≤75um particles size, with polyvinyl alcoholpowder of 212-300um particle size, as a space holder, by volume ratio (70:30) % respectively. The mixed powder wascompacted using punch and die set -specially designed for this study –under 20 bar then sintering at 900 ºC by theuse of argon gas. Twenty smooth titanium implants were prepared of (3.2mm in diameter and 8mm in length) bylathing of commercially pure titanium rod as a control group. The implants were examined by X-ray diffraction (XRD)and scanning electron microscope (SEM), as well as estimation of porosity percentage. For each tibia of the 20 whiteNew Zealand rabbits, one implant of each type (one porous in right, and the smooth in left tibia), were insertedthrough surgical procedure carried under serial condition. Mechanical test was performed to evaluate the boneimplantinterface, after (2 and 6 weeks) healing periods .Results: Porous implants were obtained successfully by powder technology with 52% porosity and pore size 210um17±. The porous implant showed significantly higher removal torque values when compared to smooth implants atthe two different intervals of examination (2,6 weeks) , this proved to be statistically highly significant, also a highlysignificant difference was noticed for the means of the torque removal values in the same group at differentimplantation , with no evidence of clinical features of inflammatory reaction with both .Conclusions: Powder technology seemed to be particularly advantageous in fabrication of porous titanium. Porousimplant show an increasing bone ingrowth compared with the smooth type represented by higher removal torquefor both healing periods (2, 6) weeks

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