Tabriz University of Medical Sciences Journal of Dental Research, Dental Clinics, Dental Prospects 2008-210X 10 3 2016 08 17 The sealing ability of novel Kryptonite adhesive bone cement as a retrograde filling material 189 193 10.15171/joddd.2016.030 EN Ýsmail Uzun Cangül Keskin Buðra Güler Journal Article 10.15171/joddd.2016.030 2016 08 28 2016 08 28 Background. This study evaluated theability of Kryptonite bone cement insealing retrograde cavities. Methods. The root canals of one hundred extracted human maxillary incisor teeth were instrumented up to master apical file #40 using Mtwo rotary system and obturated with gutta-percha and AHPlus sealerby cold lateral compaction method. The specimens were assigned to one control group and four experimental groups based on the retrograde filling materials (n=20). The specimens were immersedin 0.5% Rhodamine B solution for 48h. Then the specimens were divided longitudinally into two parts and the depth of dye penetration was assessed under ×10 magnification. Data were analyzed using one-way ANOVA and Bonferroni tests. Results. There werestatistically significant difference between the experimental groups and the control group (P<0.05). There wereno statistically significant differences betweenthe experimental groups in dye penetration scores (P>0.05). Conclusion. Kryptonite cement provided optimal apical seal in a manner similar to MTA, amalgam and IRM when used as a retrograde filling cement.