Objective: This study examines the effect of locking plates on fixation reliability in mandibular lateral defects of different lengths through finite element analysis. Material and Methods: A 3D model of the mandible of a 40-year-old male patient was obtained using computerized tomography. In the 3D model, 2 segmental resections measuring 25 and 50 mm in length were performed on the left mandible corpus region. The following were examined: stress values, distribution and concentration regions at the reference points on the cortical and cancellous bones, and the screw-plate system depending on the length of the locking reconstruction plates. Results: The present results showed that with increasing resection length, the tensile forces (maximum principal stress) decreased in the proximal segment, except for the screw furthest from the resection area, whereas no significant change was observed in the distal segment. As regards the compression forces (minimum principal stress), no significant change was observed in the distal segment, whereas an increase was observed in the bone around the screws furthest from the resection area in the proximal segment. Conclusion: The results suggested that as defect length increases, the middle region of the plate should be thicker.
Keywords: Finite element analysis; mandibular reconstruction
Amaç: Bu çalışma, farklı uzunluklardaki mandibular lateral defektlerde kilitli plakların fiksasyon güvenilirliğine etkisini sonlu elemanlar analizi ile incelemektedir. Gereç ve Yöntemler: Bilgisayarlı tomografi kullanılarak 40 yaşındaki erkek hastanın mandibulasının 3 boyutlu modeli elde edildi. 3D modelde sol mandibula korpus bölgesinde 25 ve 50 mm uzunluğunda 2 segmental rezeksiyon yapıldı. Kortikal ve spongioz kemikler üzerindeki referans noktalarında stres değerleri, dağılım ve konsantrasyon bölgeleri ve kilitli rekonstrüksiyon plaklarının uzunluğuna bağlı olarak vida-plak sistemi incelendi. Bulgular: Rezeksiyon uzunluğu arttıkça proksimal segmentte çekme kuvvetlerinin (maksimum asal stres) rezeksiyon alanından en uzaktaki vida dışında azaldığını, distal segmentte ise anlamlı bir değişiklik gözlenmediğini gösterdi. Kompresyon kuvvetleri (minimum asal stres) ile ilgili olarak distal segmentte önemli bir değişiklik gözlenmezken, proksimal segmentte rezeksiyon alanından en uzak vidaların etrafındaki kemikte bir artış gözlendi. Sonuç: Sonuçlar defekt uzunluğu arttıkça plak orta bölgesinin daha kalın olması gerektiğini düşündürdü.
Anahtar Kelimeler: Sonlu element analizi; mandibular rekonstrüksiyon
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