Stress Distribution in Fiber Post-Restored First Premolar Teeth with Periapical Lesions: A Finite Element Study

Abstract

Objectives This study aimed to evaluate, using three-dimensional (3D) finite element analysis (FEA), the stress distribution within endodontically treated (RCT), periapical lesioned mandibular premolar teeth restored with fiber posts and metal-supported porcelain crowns under masticatory forces. Material and Methods Two FEA models representing different clinical scenarios were developed: a healthy mandibular premolar tooth (Model 1) and an RCT premolar tooth with a periapical lesion, restored with a fiber post and a metal-supported porcelain crown (Model 2). A static load of 300 N was applied to the occlusal surface at a 45° angle to the longitudinal axis of the tooth. Maximum equivalent stresses on dental tissues, post material, surrounding bone structures, and the periapical lesion were calculated and visualized according to the Von Mises criterion. Results Functional loading concentrated stresses predominantly at the buccal cervical region in both models. However, the fiber post model exhibited relatively higher stress values and greater deformation compared to the intact tooth, particularly at the cervical area and post-dentin interface. Conclusion It has been determined that the use of fibre posts in the restoration of teeth with periapical lesions leads to a concentration of stress distribution in the cervical region and at the post-dentine interface. Therefore, the resulting biomechanical load transfer mechanisms should be evaluated through an analytical and systematic clinical assessment

Keywords

• Fiber post
• Metal-supported porcelain
• Periapical lesion
• Finite element analysis
• Biomechanics.

Fiber Post ile Restore Edilmiş Periapikal Lezyonlu Birinci Premolar Dişlerde Gerilme Dağılımının Sonlu Elemanlar Analizi ile İncelenmesi

Öz

Amaç Bu çalışmanın amacı, kök kanal tedavili (KKT), periapikal lezyonlu ve fiber post ile restore edilerek metal destekli porselen kron ile restore edilmiş mandibular premolar dişte, çiğneme kuvvetleri altında oluşan stres dağılımının üç boyutlu sonlu elemanlar analizi (SEA) yöntemiyle değerlendirilmesidir. Gereç ve Yöntemler Çalışmada iki farklı senaryoyu temsil eden SEA modelleri oluşturulmuştur: sağlıklı mandibular premolar diş (Model 1) ve periapikal lezyonlu, kanal tedavili, fiber post ve metal destekli porselen kron ile restore edilmiş premolar diş (Model 2). Modellerin oklüzal yüzeyine, dişin uzun aksıyla 45° açı yapacak şekilde 300 N değerinde statik yük uygulanmıştır. Diş dokuları, post materyali, çevre kemik yapıları ve periapikal lezyon üzerindeki maksimum eşdeğer gerilmeler Von Mises kriterine göre hesaplanmış ve simülasyon çıktıları hazırlanmıştır. Bulgular Fonksiyonel yükleme altında her iki modelde de gerilmeler ağırlıklı olarak bukkal servikal bölgede yoğunlaşmıştır. Ancak, fiber post uygulanan modelde, özellikle servikal bölgede ve post-dentin ara yüzünde, sağlam dişe kıyaslagöreceli olarak daha yüksek gerilme ve daha fazla deformasyon değerleri gözlenmiştir. Sonuç Periapikal lezyonlu dişlerin restorasyonunda fiber post kullanımının, gerilme dağılımını servikal bölgede ve post-dentin ara yüzünde yoğunlaştırdığı belirlenmiştir. Bu nedenle, ortaya çıkan biyomekanik yük aktarım mekanizmalarının analitik ve sistematik bir klinik değerlendirme ile incelenmesi gereklidir.

Anahtar Kelimeler

• Fiber post
• Metal destekli porselen
• Periapikal lezyon
• Sonlu elemanlar analizi
• Biyomekanik.

Kaynakça

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