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Wear resistance of titanium and CoCr ball attachments after thermomechanical fatigue

Purpose: The aim of this study is to investigate the wear resistance of the titanium and cobalt-chrome (CoCr) ball attachments after thermomechanical fatigue.

Materials and Methods: In this study, titanium and CoCr ball attachments were used. Study specimens were prepared with the 5-axis CNC milling machine and fixed to laboratory analogs. Thermomechanical fatigue was applied with the chewing simulator which corresponds to a 5-year aging process. After the thermomechanical fatigue process, loss of retention due to deformation of the ball attachments was measured with tensile bond strength test in an universal test machine. The changes in the surface topography as a result of the aging process were evaluated with SEM-EDX of the ball attachments and with XRD of matrices. Weight loss of the ball attachments were also recorded with a precision scale. Two-way ANOVA and Tukey post hoc tests were used to compare the datas.

Results: Loss of retention and wear were observed on both titanium and CoCr ball attachments. Tensile bond strength of the CoCr group was significantly higher than that of the Titanium group (p<0.05). Weight loss values of the Titanium group was significantly higher than that of the CoCr group (p<0.05).

Conclusion: CoCr is more successful in terms of wear resistance than titanium material.

Oguzhan Gorler
Dokuz Eylul University

Melih Ulgey
Dokuz Eylul University

Gizem Yesilyurt
Sivas Cumhuriyet University


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