Objective: Temporomandibular joint (TMJ) condylectomy has been performed for the treatment of condylar hyperplasia, with modifications such as high and proportional condylectomy being preferred based on each individual patient's needs. To clarify the effect of these modifications the stress changes after high and proportional condylectomy of TMJ condylar hyperplasia as hemimandibular hyperplasia and hemimandibular elongation were evaluated. Material and Methods: Finite element models of hemimandibular hyperplasia and hemimandibular elongation were obtained, 5 mm and 10 mm of condylectomy was simulated on these models. Pre-operative and postoperative von Misses stress, maximum principal stress values for condyle head and glenoid fossa were compared. Results: Hemimandibular hyperplasia models presented higher preoperative and postoperative stress levels both for the anatomical structures and treatment modality compared to hemimandibular elongation. The stress levels of hyperplasia and elongation models were similar on the contralateral side. The stress decrease on the affected and non-affected sides of the elongation models were balanced for both high and proportional condylectomy procedures. The stress decrease on the non-affected side of hyperplasia models were higher in proportional condylectomy. Conclusion: Proportional condylectomy has shown more favorable results in terms of reducing stress levels for both hyperplasia and elongation cases. Regarding that the pre and post-operative stress level change is more distinct in hyperplasia cases, structural adaptation process may be more prominent leading to increased tendency towards temporomandibular problems.
Keywords: Hemimandibular hyperplasia; hemimandibular elongation; finite element analysis; high condylectomy; proportional condylectomy
Amaç: Temporomandibular eklem (TME) kondilektomisi, kondiler hiperplazi vakalarının tedavisi için uygulanmakta ve her vakanın ihtiyacına göre yüksek seviyeli ya da oransal kondilektomi olarak modifikasyonlar tercih edilebilmektedir. Bu modifikasyonların cerrahi sonrası TME bölgesindeki etkisini anlamak amacıyla, hemimandibular hiperplazi ve hemimandibular elongasyon modellerinde yüksek ve oransal kondilektomiden sonra stres değişiklikleri incelenmiştir. Gereç ve Yöntemler: Hemimandibular hiperplazi ve hemimandibular elongasyon sonlu eleman modelleri oluşturuldu ve bu modeller üzerinde 5 mm ve 10 mm kondilektomi simülasyonları yapıldı. Kondil başı ve glenoid fossa için preoperatif ve postoperatif von Mises stres ve maksimum asal gerilim değerleri karşılaştırıldı. Bulgular: Hemimandibular hiperplazi modelleri hem anatomik yapılar hem de tedavi modalitesi açısından hemimandibular elongasyon modellerine kıyasla daha yüksek preoperatif ve postoperatif stres değerleri gösterdi. Etkilenmeyen tarafta stres seviyeleri, hiperplazi ve elongasyon modelleri için benzer bulundu. Elongasyon modellerinde hem yüksek hem de oransal kondilektomi prosedürleri sonrası, etkilenen ve etkilenmeyen taraflarda stres düzeyindeki azalma değerleri daha dengeliydi. Hiperplazi modellerinde ise oransal kondilektomi sonrası etkilenmeyen tarafta stresin daha belirgin bir şekilde azaldığı gözlemlendi. Sonuç: Oransal kondilektomi hem hiperplazi hem de elongasyon vakaları için stres düzeylerindeki azalma açısından daha olumlu sonuçlar göstermiştir. Hiperplazi vakalarında preoperatif ve postoperatif stres seviyesi değişikliklerinin daha belirgin olduğu göz önüne alındığında, bu vakalarda yapısal adaptasyon süreci daha belirgin olabilir ve bu da temporomandibular problemlere yönelik artan bir eğilime yol açabilir.
Anahtar Kelimeler: Hemimandibular hiperplazi; hemimandibular elongasyon; sonlu elemanlar analizi; yüksek kondilektomi; oransal kondilektomi
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