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COMPARISON OF VICKERS HARDNESS VALUES OF CO-CR RESTORATIONS MANUFACTURED WITH DIFFERENT TECHNIQUES

COMPARISON OF VICKERS HARDNESS VALUES OF CO-CR RESTORATIONS MANUFACTURED WITH DIFFERENT TECHNIQUES AİM Nowadays, Co-Cr alloys are widely used dental alloys in fixed and removable prosthetic restorations. Restorations are prepared using these alloys in 3 different methods. These methods are; 1-Laser sintering method with Cad-Cam technology 2-Method of milling metal blocks with Cad-Cam technology 3- The traditional casting method. The aim of our study is to determine the hardness values of Co-Cr restorations prepared using these three methods together with the hardness values of standard Co-Cr ingots and to compare these values with each other. The results were statistically analyzed using the Oneway ANOVA test and the post hoc Tamhane's T2 test. MATERİALS AND METHODS In this study; For each group, 15 samples with a diameter of 6.5 mm and a height of 4 mm, a total of 60 samples were prepared. The experimental groups are as follows: Group 1: Co-Cr samples / CAD CAM/Metal Sintering Method Group 2: Co-Cr samples /CAD-CAM/ Millings of Metal Blocks Group 3: Co-Cr samples/ Traditional Casting Method Group 4: Co-Cr samples/Standart Co-Cr Ingots Before Casting Vickers hardness measurements were carried out by applying a 100 gr load for 10 seconds. RESULTS There was a statistically significant difference between the groups in terms of the mean Vickers hardness values (p:0.000; p<0.05). Post hoc Tamhane's T2 test was performed to determine which group the significance originated from. According to the mean hardness value of Group 1 was significantly higher than Group 2, Group 3 and Group 4 (p1-2:0.000; p1-3:0.000; p1-4:0.031; p<0.05). The mean hardness value of Group 4 was significantly higher than Group 2 and Group 3 (p4-2:0.000; p4-3:0.000; p<0.05). The mean hardness of Group 2 was significantly higher than Group 3 (p2-3:0.000; p<0.05).

CONCLUSION According to the findings of this study; Co-Cr samples prepared by sintering method have the highest hardness value. This is followed by samples prepared from standard Co-Cr ingots before casting. When traditional casting is made using these ingots, it is seen that they cannot maintain their hardness values before casting and they have the lowest hardness values.

Bülent Demirbaş
Marmara Üniversitesi SHMYO
Turkey

Gülden Sınmazışık
Marmara Üniversitesi SHMYO
Turkey

 


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