Effect of intra-orifice depth on sealing ability of four materials in the orifices of root-filled teeth: An ex-vivo study

Abstract

Aim. To investigate the effect of orifice cavity depth on the sealing ability of Fusio, Fuji II, Fuji IX, and MTAG. Materials and Methods. Ninety-two canals in extracted mandibular premolars were prepared, obturated, and randomly grouped into 4 groups. Each group was subgrouped for a 2mm and 3mm orifice cavity depth (n=10). The remaining roots were divided to serve as positive and negative controls (n=6). Cavities of the 4 experimental groups were filled with the respective materials and subjected to methylene blue dye leakage. Linear leakage was measured in mm using a stereomicroscope. Statistical Analysis. Kruskall-Wallis test was used at P<0.05, and t-test was done to compare 2mm and 3mm. Results. All tested materials leaked to various degrees. Significantly higher leakage score was found for Fuji IX, Fusio, Fuji II, and MTA G in a descending order, when the materials were placed at 3mm depths. A significant difference was found in the leakage score between the 2mm and 3mm depths in all tested materials with the 3mm depth showing a greater leakage score in all tested materials. Exception was in MTA G at 2mm and 3mm depths (0.551mm±0.004mm and 0.308mm±0.08mm, resp.). Conclusion. The null hypothesis should be partially rejected. Fusio and MTA G were affected by orifice cavity depth with regard to their sealing ability. MTA G had the least leakage when placed at 2 or 3mm depths, and Fusio is the next when placed at 2mm depth. Two millimeters orifice cavity depth is suitable for most adhesive orifice barrier materials. © 2012 Motaz Ahmad Ghulman and Madiha Gomaa.