Aim of study: to compare the ability of four restorative materials (MTA - Composite
- Zinc Phosphate - Glass Ionomer Cement) in coronal sealing of the endodontically treated
root canal orifice in extracted teeth.
Materials and Methods: 60 extracte
d teeth with single canal were chosen. X-Ray
Images were taken, then their crowns were cut off by using diamond disc, then the canals
were classically prepared, after that, they were filled with Zinc Oxide Eugenol Cement and
the gutta-percha cones using Lateral Condensation technique. They were left for (24) hours
in order to ensure the quite hardening of the filling material. After that, the filling material
was removed vertically by using an eraser tool up to a depth of (2) mm inside the root
canal. Then, the teeth were randomly divided into four groups, each contained (15) teeth
(n1=n2=n3=n4=15). The entry orifices of all the teeth were filled with one of the
restorative materials. The teeth were coated with Varnish except for 1 mm around orifices,
After then, they were immersed in Methylene Blue Dye of 2 % for five minutes. After that,
the teeth were washed under a stream of plentiful water and left to dry. Longitudinal
sections were made in the buccal lingual direction. Then the sections were examined under
the optical magnifier to measure the liner dye leakage using a millimeter ruler designed by
“AutoCAD 2013” Program.