TY  - JOUR
T1  - İntramedüller Çivilerin Statik ve Dinamik Eğilme Özelliklerinin Deneysel ve Teorik Olarak İncelenmesi
TT  - Experimental and Theoretical Investigation of Static and Dynamic Bending Properties of Intramedullary Nails
AU  - Kovacı, Halim
PY  - 2019
DA  - August
DO  - 10.18185/erzifbed.454431
JF  - Erzincan University Journal of Science and Technology
PB  - Erzincan Binali Yildirim University
WT  - DergiPark
SN  - 2149-4584
SP  - 595
EP  - 606
VL  - 12
IS  - 2
LA  - tr
AB  - Kemik iliği içerisineyerleştirilerek uzun kemiklerin tedavisinde kullanılan intramedüller çivilerdenen büyük beklenti kemik iyileşmesi süresince hasara uğramamaları ve yeterli yükdağılımına olanak sağlamalarıdır. Ticari olarak farklı pek çok türdeintramedüller çivi olmakla birlikte bu çiviler içerisinde en çok kullanılantürlerden biri silindirik kesitli içi boş olan türleridir. Ayrıca,intramedüller çivilerin en kötü koşullarda çalışmasını referans alan birçokuluslararası biyomekanik test standardında statik ve dinamik eğilme yükleridikkate alınmaktadır. Ancak, içi boş şekilde üretilen intramedüller çivilerin,kesit kalınlığının değişimi sebebi ile bu yükler altında özelliklerinin neyönde değişeceği bilinmemektedir. Bu sebeple, bu çalışmada, intramedüllerçivilerde kesit etkisinin intramedüller çivilerinin statik ve yorulmadayanımları üzerindeki etkileri incelenmiştir. Bu amaçla, Grade 23 Ti6Al4V ELImalzemeden imal edilen 6.2, 6.7 ve 7.2 mm kesit kalınlığına sahip içi boşgeometrideki intramedüller çiviler statik dört noktadan eğme ve yorulmatestlerine tabii tutulmuşlar. Testler sonrasında, intramedüller çivilerde kesitkalınlığı arttıkça hem statik hem de yorulma dayanımlarının arttığıbelirlenmiştir. Bununla birlikte, statik dört noktadan eğilme deneylerisonucunda elde edilen sonuçlar ile teorik olarak hesaplanan değerler kullanılarak;intramedüller çivilerin tasarımı aşamasında kullanılabilecek matematiksel birmodel oluşturulabileceği belirlenmiştir. Ayrıca, intramedüller çivilerde kesitkalınlığı arttıkça yorulma dayanımının da arttığı ancak artan kesitkalınlığındaki artış oranı ile yorulma dayanımındaki artışın doğru orantılıolmadığı gözlemlenmiştir.
KW  - İntramedüller çivi
KW  - biyomekanik
KW  - eğilme
KW  - dört noktadan eğme
KW  - yorulma
N2  - The greatest expectation fromintramedullary nails, which are used in the treatment of long bones by placingin the bone marrow, is that they cannot be damaged during bone healing andallow the adequate load distribution. There are many different kind of commerciallyavailable intramedullary nails and also, one of the mostly used types of thisnails are hollow nails. Also, static and fatigue bending loads are taken intoaccount in different international biomechanical test standards, which refersthe worst-case working conditions. However, the intramedullary nails producedin hollow form are not known to change their properties under these loads dueto the change in cross-sectional thickness. Therefore, the effects ofcross-sectional thickness in intramedullary nails on their static and fatigueproperties were investigated in this study. For this purpose, the hollowintramedullary nails manufactured from Grade 23 Ti6Al4V ELI with thicknesses of6.2, 6.7 and 7.2 mm were subjected to static four-point bending and fatiguetests. After tests, it was observed that both static and fatigue strengths ofnails improved with increasing cross-sectional thickness. Also, it wasdetermined that a mathematical model to be used in the design process of nailscan be established by using static four-point bending tests results andtheoretical results. Additionally, it was observed that there wasn’t a directproportion between increasing cross-sectional thickness and increase rate offatigue strength although fatigue properties of intramedullary nails improvedwhen its cross-sectional thickness increased.
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UR  - https://doi.org/10.18185/erzifbed.454431
L1  - https://dergipark.org.tr/en/download/article-file/797495
ER  -