Pengaruh Radiasi Gamma Terhadap Sifat Mekanik UHMWPE Untuk Tibial Tray

Abstract

Dalam ortopedi UHMWPE sering digunakan sebagai bantalan materi (tibial tray) pada sendi lutut buatan. Namun dalam penggunaannya, keausan bahan UHMWPE merupakan salah satu faktor utama yang memperpendek umur pakai sendi lutut buatan sehingga diperlukan metode untuk meningkatkan sifat mekanik UHMWPE. Tujuan penelitian ini adalah untuk mengetahui pengaruh radiasi sinar gamma terhadap sifat mekanik dan tingkat keausan dari UHMWPE sehingga dapat memenuhi kualifikasi bahan baku pembuatan tibial tray serta mengetahui dosis optimum yang diperlukan UHMWPE agar diperoleh bahan yang tahan terhadap keausan dan memiliki sifat mekanik yang lebih baik. Pembuatan tibial tray dilakukan dengan metode molding pressure dengan radiasi gamma. Pembuatan film UHMWPE dilakukan dengan hot press pada 170 °C selama 3 menit dan tekanan 200 kg/cm 2. Kemudian film tersebut dipanaskan ke dalam furnace pada 128 o C selama 100 menit dan diradiasi dengan irradiator karet alam (IRKA) pada dosis 0 kGy, 50 kGy, 100 kGy, 125 kGy dan 150 kGy. Berdasarkan hasil karakterisasi sifat tibial tray dengan XRD, FT-IR, alat uji tarik, alat uji kekerasan, dan alat uji keausan, dapat disimpulkan bahwa efek radiasi terhadap polimer UHMWPE adalah terbentuknya ikatan silang dan degradasi bahan. Sehingga, semakin tinggi dosis radiasi dihasilkan sifat bahan yang semakin keras serta tahan terhadap aus. Selain itu, dapat diketahui bahwa dosis 100 kGy merupakan dosis optimal untuk meningkatkan sifat mekanik bahan

The Effect of Gamma Irradiation on HDPE/HA Composite as Candidate Material Dental Implant

“…The cross bonding occurs, which causes HDPE structure to be semicrystalline or the occurrence of HDPE phase changes from the crystalline phase to the amorphous phase. This is in accordance with [16] that the degree of crystallinity decreases after the gamma irradiation-decreased degree of crystallinity due to degradation. The process of degradation through oxidation resulted in a radical migration from the crystalline phase to the amorphous surface [17] .…”

Enhancing Thermal and Mechanical Properties of UHMWPE/HA Composite as Tibial Tray

“…5) show that their hardness was directly proportional to the radiation dose. Pure UHMWPE (0% HA) hardness values are in the range of 42 to 43 Shore D, while composites hardness values are in the range of 46 to 50 Shore D. The The hardness of composites is also higher than irradiated UHMWPE (0-150 kGy) reported by Sukaryo et al [8] where the hardness ranged from 38 to 46 Shore D. The hardness values also increased with increasing HA content in the composites (Fig. 5).…”

“…UHMWPE particles released due to wear may also cause inflammation in surrounding tissues leading to osteolysis [7]; therefore, further efforts are needed to enhance the physical properties of UHMWPE as a tibial tray. Ionizing radiation (e.g., gamma rays) is commonly used to initiate cross-linking between the polymer chains, and this approach successfully enhances the physical properties of many polymers [8]. However, oxidation related to radical promoted reactions limits the use of this approach [9].…”

Effect of Hydroxyapatite Filler on Mechanical Properties of PE/HAp Composite as a Candidate for Bone Repair

“…When the composite melts, the crystallinity of PE decreases [3] and has an irregular particle arrangement, resulting in a physical reaction with HAp. HAp can fill the amorphous particles of PE and physically bond to improve its mechanical properties.…”