Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 18 0 2021 12 08 3330 3330 Sedighe Sadat Hashemikamangar Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran Sara Valizade Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Alireza Mahmoudi Nahavandi Color Imaging and Color Image Processing Department, Institute for Color Science and Technology, Tehran, Iran Masoomeh Hasani Tabatabaei Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Marzieh Daryadar Department of Operative Dentistry, Tehran University of Medical Science 2019 10 21 2020 08 16 Objectives: This study aimed to develop a new method for measurement of florescence and compare the fluorescence of some clinical dental ceramics in different thicknesses. Materials and Methods: Forty-eight samples of feldspathic (Vita VM9, A2), IPS e.max (Ivoclar HT, A2), zirconia (Korox Zircostar, A2) and Enamic (Vita A2) ceramics were used in this study in 0.5 and 1 mm thicknesses. The fluorescence of the samples was measured by using a developed technique. The results were analyzed by two-way ANOVA and Duncan post-hoc test. P<0.05 was considered significant. Results: Enamic, feldspathic and e.max ceramics had significantly different fluorescence in descending order (P=0.000). Fluorescence of ceramics increased with an increase in their thickness from 0.5 to 1 mm (P=0.007). Conclusion: The results confirmed the applicability of the presented method for measurement of fluorescence of dental ceramics. While, the thickness of restoration determines the concentration of the fluorescent agent, some additional technical information is required for justification of the observed trend in the studied ceramics. Keywords: Fluorescence; Ceramics; Zirconium Oxide; VITA Enamic https://fid.tums.ac.ir/index.php/fid/article/view/3330