Efe Can SİVRİKAYA, Mehmet GÜLER, Muhammed Latif BEKCİ

Evaluation of Stress Distributions of Zirconia Connecting Screw in Bruxism: A Finite Element Analysis

Background: The purpose of the present study was to evaluate the stress distributions of zirconia or titanium connecting screws under different loads (vertical and oblique) in bruxism patients and to indicate its applicability by comparing with physiological stress limit values. Methods: Four different models were created in which the implants were the same size and design, with dental implant, abutment and connection screws made of zirconia or Ti (only screw). 3D-Finite element analysis (3D-FEA) was applied to study the effect of a vertical load (1000 N) and oblique load (an angle of 30°) on abutments in the models. The placement of implants are mandibular right first molar. Computerized tomography imaging of cadaver mandibles was used. Von Mises stresses of the different screw materials were compared with each other and the physiological stress limit values for zirconia. Results: Von Mises stress values increased in oblique loading in all models. The von Mises stress values were significantly reduced in the titanium screw than zirconium under both loading simulations. Conclusion: In patients with a high biting force physiological stress limit values for zirconia were not exceeded. Zircon connection screw may be used in patients with bruxism.

Bruksizm Hastalarında Zirkon Bağlantı Vidasının Stres Dağılımlarının Sonlu Elemanlar Analizi İle Değerlendirilmesi

Amaç: Çalışmanın amacı, bruksizm hastalarında farklı materyallerdeki implant-abutment bağlantı vidasında meydana gelen stress dağılımının değerlendirilmesidir. Ayrıca fizyolojik stress limit değerleri ile karşılaştırılarak uygulanabilirliğini belirtmektir. Gereç ve Yöntemler: İmplantların, abutmentlerin ve bağlantı vidalarının aynı dizayn ve boyutta olduğu 4 model oluşturuldu. Bağlantı vidası titanium veya zircon olarak modellendi, diğer materyaller ise titanium olarak modellendi. Bruksizmli hastaların ısırma kuvvetinin taklidi için 1000 N dikey veya 30° açılı yükleme abutmentlerin orta noktalarına uygulandı. Modellenen implant sağ mandibular birinci molar hizasındadır. Mandibulanın modellenmesinde kadavranın bilgisayarlı tomografi görüntüleri kullanıldı. Farklı bağlantı vidası materyallerinde meydana gelen (zircon veya titanium) von Mises stress değerleri karşılaştırıldı. Ayrıca zirkonyum bağlantı vidasındaki von Mises stress değerleri zirkonyumun fizyolojik stress limit değeri ile karşılaştırıldı. Bulgular: Von Mises stres değerleri tüm modellerde 30° açılı yüklemede artmıştır. Von Mises stres değerleri, her iki yükleme simülasyonunda titanyum vidada zirkonyuma göre önemli ölçüde azaldı. Sonuç: Isırma kuvveti yüksek olan hastalarda zirkonyum fizyolojik stres limit değerleri aşılmamıştır. Bruksizm hastalarında zirkon bağlantı vidası kullanılmasında sakınca yoktur.

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