The aim of this study was to evaluate the effect of different surface finishing processes on the color stabilities of lithium disilicate glass-ceramics, zirconia-reinforced lithium silicate ceramics, and resin nanoceramics after artificial ageing. MATERIALS AND METHODS. 216 samples were prepared from 3 different CAD/CAM materials (LAVA Ultimate, IPS e.max CAD, VITA Suprinity) with A1 HT color at a size of 14 × 12 mm and a thickness of 0.5 ± 0.05 mm. Color measurements of the samples were performed with a spectrophotometer using color parameters and CIE Lab color system on a gray backing between baseline color and after 5000 cycles of artificial ageing in 4 stages (i.e. the first measurement before the treatment, the second measurement after polishing, the third measurement after cement application, and the fourth measurement after artificial ageing). The results were evaluated using the Variance analysis and Fisher's LSD test. RESULTS. Resin nanoceramics (LU) exhibited higher color change values than zirconia-reinforced lithium silicate (VS) and lithium disilicate (EC) ceramics after artificial ageing. Manual polishing and glazing resulted in similar color change for LU and VS (P>.05). In the EC group, glazing provided statistically different results as compared to the manual polishing and control groups (P<.05). Among the ceramic groups, color change values of the subgroup, which was treated by glazing, of the zirconia-reinforced lithium silicate (VS) and lithium disilicate (EC) samples were below the clinically acceptable level (ΔE < 3.5). CONCLUSION. The lowest color change for all stages was observed in Vita Suprinity.
Aim:The objectives of this study are to evaluate the anxiety levels of patients toward dental treatment during the pandemic process, to obtain information about the level of awareness, perceptions and attitudes of patients seeking dental treatment and to determine the relationship between anxiety levels and socio-demographic variables of individuals. Material and Method: A total of 300 patients who applied to the dentistry faculty were included in the study, and a survey questionnaire was administered to these patients. The survey consisted of three parts; in the first part, the socio-demographic features of the patients were asked, in the second, the State-Trait Anxiety Inventory (STAI) developed by Spielberger was used to measure the level of anxiety, and in the last part, a questionnaire form about the perceived sensitivity to COVID-19 developed by the authors was applied. The statistical analysis of the data was performed with SPSS for Windows version 24.0 and a p value less than 0.05 was accepted as statistically significant. The normality of distribution of continuous variables was tested by the Shaphiro-Wilk test. The Mann Whitney U, Kruskal-Wallis and Dunn multiple comparison tests were used to compare non-normal data between two or more groups. Results: A total of 300 patients, 155 men and 145 women, participated in the study. The mean state anxiety score was 43.38±8.34. Significant differences were not found among the independent variables affecting the level of anxiety, age, gender, marital status, education, whether individuals have had COVID-19. When the questions evaluating the patients' perception on dental treatment were compared with the anxiety scores, there were statistically significant differences among groups. Conclusion:The study results revealed that the patients had a high level of anxiety in places such as dental hospitals where many patients are treated, but they were aware of the preventive measures to be taken during the pandemic process.
Different post-core systems were used to prosthodontic treatments for teeth, which were endodontically treated or had excessive loss of coronal tooth structures, from past to present. In the past, when only metal post systems were used, but because of rising aesthetic expectations and developing of adhesive dentistry, manufacturers have tried to find new materials, finally ceramic and fiber reinforced composite post systems have been developed. Each post system has its advantages and disadvantages. The success or failure of restoration is directly related to knowing the characteristics of the post. The most significant features of post systems are having similar physical properties to dentin, being compatible with the surrounding tissue and prosthetic restoration, causing minimal stress on teeth and being easy to practice. Aim of this review is to evaluate the post systems and examine the place of the future. Keywords: Post systems, metal, ceramic, fiber Özet Endodontik tedavi görmüş ve aşırı koronal diş dokusu kaybına uğramış dişlerin protetik tedavisinde geçmişten günümüze farklı post-kor sistemleri kullanılmıştır. Eskiden sadece metal post sistemleri kullanılırken, estetik beklentilerin artması ve adeziv diş hekimliğinde meydana gelen gelişmelerden dolayı üretici firmalar yeni materyal arayışına girmişlerdir, sonucunda seramik ve fiberle güçlendirilmiş kompozit post sistemlerini geliştirmişlerdir. Her post sisteminin avantajları ve dezavantajları bulunmaktadır. Restorasyonun başarısı veya başarısızlığı postların özelliklerinin bilinmesiyle doğrudan ilişkilidir. Dentine benzer fiziksel özellikler taşıması, çevre dokular ve protetik restorasyonlarla uyumlu olması, dişte minimal strese neden olması ve uygulamasının kolay olması post sistemlerinde aranan en önemli özelliklerdir. Bu derlemenin amacı; post sistemlerini değerlendirmek ve gelecekteki yerini incelemektir.
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