Tam seramik sistemlerde tekrarlanan fırınlama işlemlerinin etkisinin densitometrik analizi ve R-RAY floresans (XRF) ile değerlendirilmesi
Özet
The purpose of this study was to investigate the changes that occured in all-ceramic systems depending on repeated firing procedures by densitometric analysis and XRF. The two different all-ceramic system materials used in this study. The one is the IPS emax press all-ceramic systems and the other one is zirconium oxide all-ceramic systems. Each group consists of 6 sub-groups and every sub-group consists of 10 samples prepared in a total of 120 full-ceramic samples.IPS e-max press all-ceramic systems and zirconium oxide all-ceramic systems with 6 sub-groups were created. These groups; the control group, 1 time firing, 3 times firing, 5 times firing, 7 times firing and 9 times firings. Dental radiographs were taken from each group. On these dental films 10 all-ceramics samples, 1,0 mm cross-section of tooth and 12 digit aluminum step-wedge was placed and exposed. The densitometric analysis of radiographs of 12 were made with Densonorm 21i densitometer.The data obtained were statistically analyzed by ANOVA and LSD test. At the end of statistical analysis; radiopacity values of all-ceramic systems decreased when the number of firings were increased. In other words, it was concluded that all ceramic samples became more radiolucent. However, it was reported that to observe restorations radiographically, radiopacity values of restorations should be equivalent to enamel or slightly high.The results of XRF analysis has shown that; at the end of repeated firings the Fe, Bi, Ca, Cr, Co, Cu, Ga, Ge, As, Se, Cs, Hf, Pb, Sr, Br, Rb, Y and Ta elements that generate metal oxides have varied and moved away from the structure in both of all-ceramic systems. According to densitometric and XRF analysis results, the effects of repeated firing procedures on all-ceramic systems should be considered by clinicians.