The effect of three different sealers on the radiopacity of root fillings in simulated canals.

Objective: The aim of this study was to investigate the effect of 3 root canal sealers on radiopacity of root fillings in simulated canals by means of direct digital radiography.

Study Design: Thirty simulated root canals in transparent acrylic blocks were prepared with a 4% tapered, size 25 instrument. A single 4% tapered, size 25 gutta-percha cone was inserted into each canal. Standardized images of the blocks with an aluminum step-wedge were obtained by using Digora storage phosphor plates. Then, 3 root canal sealers (Roeko, Diaket, Pulpdent) were mixed according to the manufacturers' instructions. The gutta-percha cones were completely coated with one of the sealers and placed in the identical canal to the full working length. The images of the blocks were reobtained after sealer application. The mean gray values (MGVs) of root fillings were measured with or without the sealer at 3 different levels (1 mm, 6 mm, and 11 mm from apex) by using the Image Tool program. Each MGV measurement was then converted to its aluminum equivalent by means of the step-wedge values. A paired t test was used for statistical analysis.

Results: RoekoSeal caused a significant decrease in the radiopacity of the root fillings at the 1-mm level (P < 0.01). Diaket and Pulp Canal Sealer (PCS) increased the radiopacity of the fillings at all levels significantly (P < 0.01) except 6- and 11-mm levels of the Diaket specimens (P > 0.05).

Conclusion: The type and the thickness of root canal sealers can influence the radiopacity of the root fillings.