Evaluation of Stress Distribution in Root Canal Treated Maxillary Incisors Treated with Different Fiber-Reinforced Composite Resins by Finite Element Analysis

Abstract

Objective: The aim of this study is to evaluate the stress caused by different fiber reinforced composite resin (FRCR) restorations under functional forces in tooth models with two different types of horizontal and oblique fractures in the maxillary incisor using finite element analysis (FEA) method. Materials and Methods: A maxillary incisor with complete root development was scanned in a microcomputed tomography device. With the information obtained, two different groups with horizontal and oblique fractures were formed by creating a maxillary incisor model with three-dimensional root development. Based on the sample model, root canal treatment was performed, horizontal and oblique fracture lines were created, maxillary incisor models were restored with different FRCR and simulated in three dimensions. Then, the stresses occurring in the teeth under functional force were evaluated with the FEA method. Results: In models using FRCR, the stresses on the cervical region of root dentin and restorative material were reduced. When all models were examined, the highest stress values in both the cervical region of root dentin and the restorative material were observed in models using only composite resin. The lowest stress values were observed in the models using prefabricated long glass fiber post. It was observed that the stresses occurring in the models with the horizontal fracture line were higher than the models with the oblique fracture line. Conclusion: The use of FGKR in teeth with crown fractures will help reduce both the stresses in the cervical region of root dentin and the stresses on the restorative material. Models restored with FGKR created less stress and strengthened the tooth structure more.

Keywords

• FRCR
• FEM
• nanofil composite
• post
• complicated crown fracture

Farklı Fiberle Güçlendirilmiş Kompozit Rezinler ile Tedavi Edilen Kök Kanal Tedavili Maksiller Kesici Dişlerde Oluşan Stres Dağılımının Sonlu Elemanlar Analizi ile Değerlendirilmesi

Abstract

Amaç: Bu çalışmanın amacı, maksiller kesici dişte horizontal ve oblik iki farklı kırık tipine sahip diş modellerinde farklı fiberle güçlendirilmiş kompozit rezin (FGKR) restorasyonlarının fonksiyonel kuvvetler altında oluşturduğu stresin sonlu elemanlar analizi (SEA) yöntemiyle değerlendirilmesidir. Materyal ve Metod: Kök gelişimi tamamlanmış bir maksiller kesici diş mikrobilgisayarlı tomografi cihazında taranmıştır. Elde edilen bilgilerle üç boyutlu kök gelişimi tamamlanmış maksiller kesici diş modeli oluşturularak, horizontal ve oblik kırığa sahip iki farklı grup oluşturulmuştur. Örnek model esas alınarak, kök kanal tedavisi yapılmış horizontal ve oblik kırık hattı oluşturulmuş, maksiller kesici diş modelleri farklı FGKR ile restore edilerek üç boyutlu olarak simüle edilmiştir. Ardından dişlerde fonksiyonel kuvvet altında oluşan stresler SEA yöntemiyle değerlendirilmiştir. Bulgular: FGKR kullanılan modellerde kök dentininin servikal bölgesi ve restoratif materyalde oluşan stresler azalmıştır. Tüm modeller incelendiğinde hem kök dentininin servikal bölgesinde hem de restoratif materyalde en yüksek stres değerleri yalnızca kompozit rezin kullanılan modellerde görülmüştür. En düşük stres değerleri ise prefabrik uzun cam fiber post kullanılan modellerde görülmüştür. Horizontal kırık hattına sahip olan modellerde oblik kırık hattına sahip modellere göre oluşan streslerin daha fazla olduğu görülmüştür. Sonuç: Kron fraktürüne sahip dişlerde FGKR kullanımı hem kök dentininin servikal bölgesinde oluşan stresleri hem de restoratif materyaldeki stresleri azaltmaya yardımcı olacaktır.

Keywords

• FGKR
• SEA
• nanofil kompozit
• post
• komplike kron kırığı

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