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    Biomechanical analysis of titanium fixation plates and screws in mandibular angle fractures
    (Wolters Kluwer Medknow Publications, 2016) Atik, Fatih; Ataç, Mustafa Sancar; Özkan, Arif; Kılınç, Yeliz; Arslan, Mustafa
    Objective: The aim of this study was to evaluate the mechanical behavior of different rigid fixation methods in mandibular angle fractures. Materials and Methods: Three different three-dimensional finite element models of the mandible were developed to simulate the biomechanical responses of titanium plates and screws. The fracture lines were fixed with double 4-hole straight, 4-hole square, and 5-hole Y plates with monocortical screws. 150 N incisal occlusal loads were simulated on the models. The commercial ANSYS software was utilized to calculate the Von Mises stresses on fixative appliances. Results: The highest Von Mises stress values were observed in the Y plate, whereas the lowest stress values have been found in the square plate. Conclusions: The use of square plate led to better stability and lower mechanical stresses than other techniques.
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    Biomechanical analysis of titanium fixation plates and screws in sagittal split ramus osteotomies
    (Wolters Kluwer Medknow Publications, 2016) Atik, Fatih; Ataç, Mustafa Sancar; Özkan, Arif; Kılınç, Yeliz; Arslan, Mustafa
    Objective: The aim of the study was to evaluate the mechanical behavior of three different fixation methods used in the bilateral sagittal split ramus osteotomy. Materials and Methods: Three different three-dimensional finite element models were created, each corresponding to three different fixation methods. The mandibles were fixed with double straight 4-hole, square 4-hole, and 5-hole Y plates. 150 N incisal occlusal loads were simulated on the distal segments. ANSYS software ((v 10; ANSYS Inc., Canonsburg, PA) was used to calculate the Von Mises stresses on fixative appliances. Results: The highest Von Mises stress values were found in Y plate. The lowest values were isolated in double straight plate group. Conclusions: It was concluded that the use of double 4-hole straight plates provided the sufficient stability on the osteotomy site when compared with the other rigid fixation methods used in this study.
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    Geometry and Material Comparisons of Mandibular Mini-Plate Fixators According to Fracture Types, a Finite Element Study
    (Amer Scientific Publishers, 2014) Özkan, Arif; Atik, Fatih
    The purpose of the present study is to compare the plate geometries and materials for calculating stress distributions and displacements. A model of the mandible was modeled aided with computed tomography (CT) images. The CT images were converted to the finite element model aided by reverse engineering methodology. 3 materials for mini plate and fixators (Titanium Alloy, Chrome-Cobalt and Stainless Steel) were designed with different geometry variations ("Y", "I" and "Square") and two different fracture types (linear and oblique). The finite element analyses (FEA) (In Slico) were performed with respect to displacement and stress distributions for both mandibula and fixators. According to all FEA results, "Square" type fixators for linear fracture type had a minimum stress distribution. In addition, the "I" type double fixators (for oblique fractures) with titanium alloy have more favorable stress distribution and also chrome-cobalt material for have best displacement results than the others. FEA is useful for comparing geometry and material variations of rigid mandibular fixations. The finite-element method showed that when selecting mini plate we consider geometry and material variations.
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    Mandibula kırıklarında kullanılan plak-fiksatörlerin malzeme ve geometri farklarının kırık tiplerine göre kıyaslanması
    (Düzce Üniversitesi, 2013) Atik, Fatih; Özkan, Arif
    Mandibula kırıklarında miniplak kullanımı yaygın görülen cerrahi müdahale yöntemlerinden biridir. Mandibula kemiği kırıklarında plak-fiksatör uygulaması öncesi tetkiklerde kullanılacak biyomalzemenin taşıyabileceği sınır değerlerinin ortaya konması gerekir. Plak ve fiksatörün, çenenin maksimum kuvvete ulaştığı durumlar dahil her türlü etkiye karşılık verir nitelikte olması istenmektedir. Plak ve fiksatörlerin biyouyumlulukları yanısıra uygulandıkları bölgenin ihtiyaç duyduğu yükleri de karşılayabilecek nitelikte olması beklenir. Kullanılacak malzeme ve plak geometrisinin cerrahi öncesi tetkiklerle belirlenmesi gerekir. Bu çalışmada, bilgisayarlı tomografi (BT) görüntülerinden üç boyutlu mandibula modeli oluşturulmuş, sagittal split osteotomi ve angulus bölgesinde kırık oluşturulmuştur. Her iki kırık modeli için, miniplak ve fiksatörünün farklı biyouyumlu malzemeler (Titanyum6 Alüminyum4 Vanadyum, Krom Kobalt, Paslanmaz Çelik) ile tasarlanıp gerilme analizleri ve plaklarda yaygın olarak kullanılan 3 farklı geometri oluşturulup yine herbiri için ayrı ayrı olmak üzere ANSYS programı ile sonlu elemanlar analizi yapılarak, yük taşıma kapasiteleri karşılaştırılmıştır.