Farklı niti döner eğe sistemlerinin diferansiyel taramalı kalorimetre analizi ile sıcaklığa bağlı döngüsel yorulma dirençleri arasındaki ilişkinin incelenmesi
Küçük Resim Yok
Tarih
2021
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Trakya Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Çalışmamızın amacı farklı sıcaklıklarda ayarlanmış (+4, +35 ve +60 °C) su banyosu içine yerleştirilecek dinamik test düzeneği ile sıcaklık farkının eğelerin kırılma ve döngüsel yorgunluk dirençlerine etkisi ile eğelerin faz geçiş sıcaklıkları arasındaki ilişkinin değerlendirilmesidir. Öncesinde DSC analizi yaptığımız HyFlex EDM, VDW.ROTATE ve TruNatomy eğelerinin üç farklı sıcaklıkta 5 mm yarıçap 60 derece kurvatür açısına sahip, 3 mm derinliğinde 1.5 mm genişliğinde paslanmaz çelik yapay kanalda kırılana kadarki süresi ölçüldü ve kırılana kadarki tur sayıları hesaplandı. Kırık parça uzunlukları ölçülerek kırık yüzey SEM ile görüntülendi. Üç ve üzeri gruplara göre normal dağılmayan verilerin karşılaştırılmasında Kruskal Wallis testi kullanıldı. İkili karşılaştırmalar için ise Mann Whitney U analizleri yapıldı (p<0.005). Bütün eğeler için sıcaklık 4 °C'den 60 °C'ye yükseldikçe KKTS değeri azaldı ve bu azalmanın DSC analizinde bulduğumuz sıcaklık arttıkça östenit faza geçiş ile uyumlu olduğu görüldü. DSC analizine göre kanal içi sıcaklıkta HyFlex EDM östenit faz içermezken diğer eğeler östenit faz içermekteydi ve en yüksek Af değeri HyFlex EDM'ye aitti. KKTS değerleri 4 °C'de VDW.ROTATE > TruNatomy > HyFlex EDM , 35 °C'de HyFlex EDM > VDW.ROTATE > TruNatomy , 60 °C'de ise VDW.ROTATE > HyFlex EDM > TruNatomy olacak şekilde anlamlı bulundu. SEM kullanılarak yapılan kırık yüzeylerin analizi ile kırılmaların döngüsel yorgunluk sonucu oluştuğu belirlendi. Anahtar Kelimeler: döngüsel yorgunluk, VDW.ROTATE, TruNatomy, Hyflex EDM, DSC.
The aim of our study is to evaluate the relationship between the effect of the temperature difference on the fracture and cyclic fatigue resistance of the files and the phase transition temperatures of the files with the dynamic test setup to be placed in a water bath set at different temperatures (+4, +35 and +60 °C). The time to fracture of HyFlex EDM, VDW.ROTATE and TruNatomy files, which we had previously done DSC analysis, was measured in a stainless steel artificial canal with a 5 mm radius, 60 degrees curvature angle, 3 mm deep, 1.5 mm wide, at three different temperatures, and the number of cycles until fracture was calculated. The fractured fragment lengths were measured and the fracture surface was visualized by SEM. The Kruskal Wallis test was used to compare the data that were not normally distributed according to groups of three or more. Mann Whitney U analyzes were performed for comparisons (p<0.005). As the temperature increased from 4 °C to 60 °C for all files, the NCF value decreased and this decrease was found to be compatible with the transition to the austenite phase as the temperature increased, which we found in the DSC analysis. According to DSC analysis, HyFlex EDM did not contain austenite phase at intracanal temperature, while other files contained austenite phase and the highest Af value belonged to HyFlex EDM. NCF values were found significant as VDW.ROTATE > TruNatomy > HyFlex EDM at 4 °C, HyFlex EDM > VDW.ROTATE > TruNatomy at 35 °C, and VDW.ROTATE > HyFlex EDM > TruNatomy at 60 °C. Analysis of the fractured surfaces using SEM revealed that the fractures were caused by cyclic fatigue. Keywords: cyclic fatigue, VDW.ROTATE, TruNatomy, Hyflex EDM, DSC.
The aim of our study is to evaluate the relationship between the effect of the temperature difference on the fracture and cyclic fatigue resistance of the files and the phase transition temperatures of the files with the dynamic test setup to be placed in a water bath set at different temperatures (+4, +35 and +60 °C). The time to fracture of HyFlex EDM, VDW.ROTATE and TruNatomy files, which we had previously done DSC analysis, was measured in a stainless steel artificial canal with a 5 mm radius, 60 degrees curvature angle, 3 mm deep, 1.5 mm wide, at three different temperatures, and the number of cycles until fracture was calculated. The fractured fragment lengths were measured and the fracture surface was visualized by SEM. The Kruskal Wallis test was used to compare the data that were not normally distributed according to groups of three or more. Mann Whitney U analyzes were performed for comparisons (p<0.005). As the temperature increased from 4 °C to 60 °C for all files, the NCF value decreased and this decrease was found to be compatible with the transition to the austenite phase as the temperature increased, which we found in the DSC analysis. According to DSC analysis, HyFlex EDM did not contain austenite phase at intracanal temperature, while other files contained austenite phase and the highest Af value belonged to HyFlex EDM. NCF values were found significant as VDW.ROTATE > TruNatomy > HyFlex EDM at 4 °C, HyFlex EDM > VDW.ROTATE > TruNatomy at 35 °C, and VDW.ROTATE > HyFlex EDM > TruNatomy at 60 °C. Analysis of the fractured surfaces using SEM revealed that the fractures were caused by cyclic fatigue. Keywords: cyclic fatigue, VDW.ROTATE, TruNatomy, Hyflex EDM, DSC.
Açıklama
Diş Hekimliği Uzmanlık
Anahtar Kelimeler
Diş Hekimliği, Dentistry
