The main goal of root canal treatment is to provide three-dimensional obturation of the root canal system.Root canal sealers are necessary to seal the gap between the root dentin wall and the obturating material.Calcium silicate-based materials have attracted considerable attention because of their good biocompatibility and bioactivity,enhancing the formation of crystalline structure similar to tooth and bone apatite, thereby improving sealer-to-root dentin bonding. The waterbased hydraulic calcium silicate sealers cannot be used with the warm root canal obturation techniques because heat dramatically changes the properties of the materials including setting time, flowability, viscosity and weight loss.
The aim of this study is to compare between the Ceraseal and Neosealer flo in terms of pushout bond strength and penetrability when each is used in either lateral or vertical compaction technique in single-rooted mandibular premolars.
Sixty human permanent extracted single-rooted mandibular premolar teeth will be decoronated and instrumented till size (40/04) by M3 Pro gold files with standard irrigation protocol. The specimens will then be randomly divided into 4 groups(n=15) according to the type of root canal sealer used and the obturation technique employed:Group 1 (CL): Ceraseal in lateral compaction. Group 2 (CV): Ceraseal in warm vertical compaction. Group 3 (NL): Neosealer flo in lateral compaction. Group 4 (NV): Neosealer flo in warm vertical compaction.Teeth will be sectioned horizontally into 2mm thick slices using diamond disc at marks done at 3mm and 7 mm at apical and middle parts respectively.
Then the specimens will be tested for push out bond strength Each specimen will be placed on the base of the Universal Testing Machine. Also after 72 hours from obturation, each tooth will be embedded centrally and vertically in an acrylic resin block the sections will be imaged using a confocal laser scanning microscope at 10X magnification for evaluation of penetrability.