Stress Analysis Of Fixed Dental Prostheses Produced With Different Materials According To The All-On-Four Concept

Abstract

Objective: The most important factor affecting the long-term success of implant supported systems is biomechanics after prosthesis delivery. The aim of this study was to investigate the prosthetic restorations designed by using different substructure materials on the implants placed according to All-On-4 technique in atrophic mandible with different stress analysis methods and compare the methods each other.

Methods: For this purpose, a photo-elastic resin model, according to All-On-4 concept was prepared. After taking impression, fiber-reinforced resin, PEEK, zirconia and metal substructures were manufactured with Cad/Cam. Photo elastic stress analysis was performed.   On the other hand 3D virtual models of the same substructures were formed with the .stl data of the CAD. Then finite element stres analysis was applied at the same circumstances.

Results: In the photoelastic and finite element stres analysis, rigid substructures such as metal and zirconia showed lower stres values than elastic materials such as PEEK and fiber. As a facility of the finite element analysis internal stresses of the substructures were evaluated. Lower stresses were observed in fiber and PEEK infrastructures with low elastic modulus.

Conclusion: İncreased modulus of elasticity of the infrastructure, reduced.stresses transmitted to the implants When the internal stresses of the materials were evaluated, lower stresses were seen in infrastructures such as fiber and PEEK with low elastic modulus .Photoelastic and finite element stress analyzes gave similar stress results to the implant and surrounding tissues. Therefore, the results supported each other.

Keywords

• All-On-Four,Dental Implant,Stress Analysis,Substructures

All-On-Four Konseptine Göre Farkli Materyaller İle Üretilmiş Sabit Dental Protezlerin Stres Analizleri

Abstract

Amaç: İmplant destekli sistemlerin protez tesliminden sonra uzun vadeli başarısını etkileyen en önemli faktör biyomekaniktir. Bu çalışmanın amacı, atrofik mandibulada All-On-4 tekniğine göre yerleştirilen implantlarla farklı alt yapı materyalleri kullanılarak tasarlanan protez restorasyonlarını farklı stres analiz yöntemleri ile incelemek ve yöntemleri karşılaştırmaktı.

Yöntem: Bu amaçla, All-On-4 konseptine göre foto-elastik bir rezin model hazırlandı. Ölçü alındıktan sonra, fiberle güçlendirilmiş rezin, PEEK, zirkonya ve metal alt yapılar Cad / Cam ile üretildi. Foto elastik stres analizi yapıldı. Öte yandan, aynı alt yapıların 3 boyutlu sanal modelleri, CAD'in .stl verileriyle oluşturuldu. Daha sonra aynı koşullar altında sonlu elemanlar stres analizi uygulanmıştır.

Bulgular: Fotoelastik ve sonlu elemanlar stres analizinde metal ve zirkonya gibi sert alt yapılar PEEK ve fiber gibi elastik materyallere göre daha düşük stres değerleri göstermiştir. Sonlu elemanlar analizi  imkanlarıyla alt yapıların iç gerilmeleri değerlendirildi. Düşük elastik modüllü fiber ve PEEK altyapılarında düşük gerilimler gözlendi.

Sonuç: Altyapının elastikiyet modülü arttığında implantlara iletilen stresler azalmaktadır. Malzemelerin iç gerilmeleri değerlendirildiğinde, düşük elastik modüllü, fiber ve PEEK gibi altyapılarda düşük gerilmeler görülmektedir. Fotoelastik ve sonlu elemanlar stres analizleri implant ve çevre dokularda benzer stres sonuçları vermiştir. Yani sonuçlar birbirini desteklemiştir.

Keywords

• All-On-4,Alt Yapı,Dental İmplant,Stres Analizi

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