Turkiye Klinikleri Journal of Dental Sciences

.: ORIGINAL RESEARCH
İlerletme Genioplastisinde Kullanılan Farklı Vida Sistemlerinin Stabilite ve Stres Dağılımlarının Sonlu Elemanlar Analizi ile Karşılaştırılması
Comparison of Stability and Stress Distributions of Different Screw Systems Used in Advancement Genioplasty with Finite Element Analysis
Hale YURTYAPANa, Ferhat AYRANCIa
aAğız, Diş ve Çene Cerrahisi AD, Ordu Üniversitesi Diş Hekimliği Fakültesi, Ordu, TÜRKİYE
Turkiye Klinikleri J Dental Sci. 2019;25(2):124-32
doi: 10.5336/dentalsci.2018-62215
Article Language: TR
Full Text
ÖZET
 Amaç: Genioplasti osteotomisi fiksasyonunda kullanılan titanyum mikro vida, titanyum mini vida ve rezorbe olabilen vida sistemlerinin deplasman miktarı, kemikte oluşan asal stresler ve vidalarda oluşan Von-mises stres dağılımlarının sonlu elemanlar analizi (SEA) ile karşılaştırılmasıdır. Gereç ve Yöntemler: Genioplasti osteotomisi yapılan distal fragmanın anteriora 8 mm ilerletildiği ve titanyum mikro vida (1,5 mm), mini vida (2,0 mm) ve rezorbe olabilen vida (2,8 mm) sistemleriyle fikse edildiği üç model bilgisayarda modellenmiştir. Distal fragmana horizontal olarak linguale doğru 100 N kuvvet uygulanarak oluşan von-mises ve asal stresler ile deplasman değerleri SEA ile incelenmiştir. Bulgular: En az deplasman miktarı titanyum mini vida modelinde, en fazla deplasman miktarı ise rezorbe olabilen vida modelinde hesaplanmıştır. En az von-mises stres 135,86 N/mm2 ile rezorbe olabilen vida modelinde, en fazla von-mises stresi ise 856,31 N/mm2 ile mikro vida modelinde oluşmuştur. Kemikte en fazla gerilme ve sıkışma stresleri mikro vida modelinde oluşur iken (sırasıyla 55,7 N/mm2 ve 33,4 N/mm2), en az gerilme ve sıkışma stresleri mini vida modelinde hesaplanmıştır. Sonuç: Stabilite ve stres dağılımı açısından 2,0 mm'lik mini vida modeli diğer modellerden üstün bulunmuştur. Rezorbe olabilen vida modeli de kabul edilebilir bir stabilite ve stres dağılımı sağlamıştır.

Anahtar Kelimeler: Genioplasti; rijit fiksasyon; rezorbe olabilen fiksasyon; sonlu elemanlar analizi
ABSTRACT
 Objective: The aim of our study is to compare titanium micro screw, titanium mini screw and resorbable screws used in the genioplasti procedure to analyze the principle and Vonmisses stress distribution and displacement with finite element method. Material and Method: 3 different computer models were modeled in which the distal fragment was advanced 8 mm after genioplasty osteotomy and fixed by titanium micro screw (1.5 mm), titanium mini screw (2.0 mm) and resorbable screws (2.8 mm). Tensile force of 100 N was applied to the lingual side of the lower fragment horizontally. Von-mises stress, principle stress and displacement values were analyzed with finite element analysis. Results: The least amount of displacement was calculated in the fixation model with two titanium mini screws. The maximum displacement was calculated in the resorbable screw model. In materials, the least von-mises stress 135.86 N/mm2 was calculated in the resorbable screw model, the maximum von-mises stress 856.31 N/mm2 was calculated on micro screw model. The hightest tensile and compressive stress in the bone was formed in the micro screw model (in order 55.7 N/mm2 and 33.4 N/mm2) and the minimum tensile and compressive stresses were formed in mini screw model. Conclusion: In terms of stability and stress distribution, 2.0 mm mini screw model is superior to other models. The resorbable screw model also provided acceptable stability and stress distribution.

Keywords: Genioplasty; rigid fixation; resorbable fixation; finite element analysis
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