الفهرس 
solubility
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Abstract
The concept of the three dimensional obturation is the main factor for the success of endodontic treatment. Many factors affect the stability of the obturating system such as the solubility of the core material in the body fluids and the adhesion of the obturation system to the dentin wall.
The first part of this study was designed to determine the percentage of weight loss of ActivGP points, Resilon points and conventional gutta-percha points after immersion in normal saline solution for one day, one week and one month.
The second part of the study was designed to evaluate the apical sealing ability of samples obturated with Activ GP, Resilon/Epipheny system and conventional gutta-percha with resin sealer after immersing the samples (extracted human teeth) in saline solution for one day, one week and one month. The apical sealing ability was tested using fluid filtration technique.
The results showed that there was increase in the percentage of weight loss by time and was significantly higher for Activ GP and Resilon after one month.
The results showed that the Activ GP system was stable by time and recorded the least leakage however the convetional Gutta-percha points with resin sealer recorded the highest leakage values for all tested periods. For the resilon Eipheny system the leakage increased significantly after one month observation period.
from the results of this study the following can concluded: 1. Gutta-percha, resilon and active GP are soluble by time 2. The solubility of the main core obturating material is not the only determining factor for the stability of the root canal filling material. 3. The use of the single cone ActivGP with glass ionomer sealer is promising for sealing of the root canal system.
Recommendations; 1. Long term evaluation of ActivGP system. 2. Evaluation of the solubility of ActivGP in