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Amaç: Araştırmanın amacı, ortodontide özellikle yüksek açılı vakalarda uygulanan ağız dışı aygıtlardan biri olan vertikal çeneliğin temporomandibular eklem (TME) üzerindeki biyomekanik etkilerinin ön açık kapanışı olan ve olmayan bireylerde sonlu elemanlar metodu ile değerlendirilmesidir. Gereç ve Yöntem: Vertikal çeneliğin TME’de oluşturduğu stres miktar ve dağılımının belirlenmesinde ön açık kapanışı olan ve olmayan iki farklı bireye ilişkin iki ayrı üç boyutlu geometrik model oluşturuldu (Sırasıyla Model I ve Model II). Dijital görüntülerden geometrik modellerin ağ yapısı oluşturularak stres miktar ve dağılımının hesaplanması işlemi ise ABAQUS bilgisayar programı kullanılarak yapıldı. Bulgular: 5 N`luk ortopedik kuvvet uygulayan vertikal çenelik apareyinin Model I ve Model II’deki TME’de oluşturduğu stres miktar ve dağılımında farklılıklar tespit edildi. Model I ve Model II’e ait dişlerde saptanmış olan en yüksek stres miktarını mandibular kondil bölgesi izlemektedir. Model I ve Model II’deki mandibular kondil bölgesinde tespit edilen en yüksek stres miktarları sırasıyla 5.64 MPa, 1.38 MPa’dır. Model I ve Model II’e ait mandibular kondilde tespit edilen yüksek stres bölgelerinin lokalizasyonunda da farklılıklar tespit edildi. Model I’e ait mandibular kondil başında stres üst arka bölgede lokalize, Model II’de üst ön bölgede lokalize oldu. Sonuç: Klinisyenler ön açık kapanışa sahip bireylerde kullanılan standart ortopedik kuvvetlerin TME üzerindeki olası patolojik etkileri konusunda dikkatli olmalıdır.
Objective: To evaluate the biomechanical effects of vertical chin cup, an extraoral device especially used in patients with high-angle malocclusion, on temporomandibular joint (TMJ) in those with and without previous open bite using finite element method. Materials and Method: Two different three-dimensional geometric models (Models I and II) were created for two subjects with or without the previous open bit (Models I and II, respectively) in order to determine the amount and distribution of the stresses created by vertical chin cup on the TMJ. ABAQUS software was used to calculate the amount and distribution of the stresses by forming the mesh structure of the geometric models from digital images. Results: There were differences in the amount and distribution of the stresses on the TMJ in Models I and II created by vertical chin cup with an orthopedic force of 5 N. Mandibular condylar region follows the highest amount of stress tension found in the teeth of Models I and II. The highest amount of stress detected in the mandibular condylar area in Models I and II were 5.64 and 1.38 MPa, respectively. There were differences in the localization of high stress zones found in the mandibular condyle of Models I and II. The stress at the mandibular condylar head of Model I was localized in the upper posterior region whereas it was localized in the upper front region in Model II. Conclusion: Clinicians should be aware of the possible pathological effects of standard orthopedic forces on TMJ in subjects with anterior open bit.
Objective: To evaluate the biomechanical effects of vertical chin cup, an extraoral device especially used in patients with high-angle malocclusion, on temporomandibular joint (TMJ) in those with and without anterior open bite using finite element method. Materials and Method: Two different three-dimensional geometric models (Models I and II) were created for two subjects with or without anterior open bite (Models I and II, respectively) in order to determine the amount and distribution of the stresses created by vertical chin cup on the TMJ. ABAQUS software was used to calculate the amount and distribution of the stresses by forming mesh structure of the geometric models from digital images. Results: There were differences in the amount and distribution of the stresses on the TMJ in Models I and II created by vertical chin cup with an orthopedic force of 5 N. Mandibular condylar region follows the highest amount of stress tension found in the teeth of Models I and II. The highest amount of stress detected in the mandibular condylar area in Models I and II were 5.64 and 1.38 MPa, respectively. There were differences in the localization of high stress zones found in the mandibular condyle of Models I and II. The stress at the mandibular condylar head of Model I was localized in the upper posterior region whereas it was localized in the upper front region in Model II. Conclusion: Clinicians should be aware of the possible pathological effects of standart orthopedic forces on TMJ in subjects with anterior open bite.
Alan : Sağlık Bilimleri
Dergi Türü : Ulusal
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