İmplant-Çimento Arayüzeyinin Kesme Dayanımını Etkileyen Faktörlerin İncelenmesi

Çimentolu kalça implantı bağlantılarında görülen en önemli hasarlardan biri aseptik gevşemedir. Aseptik gevşemede kemik-çimento ve çimento-implant arayüzeylerinde ayrılmalar meydana gelebilmektedir. Arayüzeylerde ne kadar dayanıklı bağlantılar elde edilebilirse o kadar uzun ömürlü cerrahi operasyonlar gerçekleştirilmiş olur. Çimento-implant arayüzeylerinde baskın olan gerilme, kesme gerilmesidir. Bu çalışmada pin-halka test yönteminden faydalanılarak çimento-implant arayüzeyinin kesme dayanımı araştırılmıştır. Ayrıca implant malzemesinin, yüzey pürüzlülüğünün ve çimento manto kalınlığının değişmesi ile arayüzey kesme dayanımında meydana gelen değişmeler incelenmiştir. İmplant malzemesi olarak implant üretiminde yaygın bir şekilde kullanılan titanyum alaşımı ve paslanmaz çelik malzemeler kullanılmıştır. Yüzey pürüzlülüğü değerleri farklı boyutlarda alüminyumoksit taneleri ile kumlama sonucunda elde edilmiştir. Delrinden imal edilen farklı iç çap ölçülerine sahip burçlar ile farklı manto kalınlıkları elde edilmiştir. Elde edilen bulgular, yüzey pürüzlülüğünün artması ile arayüzey kesme dayanımının arttığını, titanyum alaşımı malzemenin daha yüksek arayüzey bağlantısı sağladığını ve ideal manto kalınlığının 2-3 mm arasında olduğunu göstermektedir.

Anahtar Kelimeler:

Kemik çimentosu, implant, kesme dayanımı, pim-halka testi

Investigation of Factors Affecting Shear Strength of Implant-Cement Interface

One of the most important failure in cemented hip replacement is aseptic loosening. Separation may occur at the bone-cement and cement-implant interfaces because of aseptic loosening. The more durable connections can be obtained at the interfaces; the longer surgical operations are performed. The predominant stress at cement-implant interfaces is shear stress. In this study, the shear strength of the cement-implant interface was investigated by using the pin-collar test method. In addition, changes in interfacial shear strength with changes in implant material, surface roughness and cement mantle thickness were investigated. Titanium alloy and stainless-steel materials widely used in implant manufacturing, were used as implant materials. Surface roughness values were obtained by sandblasting with different sized aluminium oxide grains. Different mantle thicknesses have been achieved with the bushes with variable inner diameter sizes made of Delrin. The results show that with the increase in surface roughness, the interface shear strength increases, the titanium alloy material provides higher interface connection, and the ideal mantle thickness is between 2-3 mm.

Keywords:

Bone cement, implant, shear strength, pin and collar test,

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