الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 134 |  |  |
| | | from | 134 | | |
Abstract
This study compared the effect of moisture on push-out bond strength for mineral trioxide aggregate (MTA Fillapex), Resin based (AH Plus) and Bioceramic (Ceraseal) sealer.
One hundred thirty five single rooted teeth were decoronated at the cemento-enamel junction to standard root length which was 16 mm. Samples were prepared with rotary instruments up to apical size 35/.04 and 5ml of 2% Naocl. After preparation, the canals were irrigated using 5ml of 17 %EDTA for 1minute as final flush to remove smear layer followed by 5ml of saline for 5 minutes to remove any remnants for irrigation.
Samples were divided randomly into three main groups according to drying method (n=45) for each group. group (A): paper point, group (B): wet and group (C): drying with ethanol. After drying protocols samples were divided into three subgroups according to the sealers used. Subgroup (Ⅰ): AH Plus, subgroup (Ⅱ): ceraseal and subgroup (Ⅲ): MTA Fillapex. Samples were stored (37◦C and 95% humidity) for 7 days to allow complete setting of the sealers. Samples were sectioned horizontally into slices with (2mm) thickness for push-out test and EDX analysis to determine failure adhesive and cohesive. Other samples were sectioned vertically for scanning with electron microscope to evaluate interfacial adaption and sealer penetration.
Data were collected, tabulated and statistically analyzed with the following conclusion:
Irrigation with 2% Naocl followed by EDTA were effective in root canal debridement and resulted in more opening of dentinal tubules achieving better sealer penetrability.
Regardless dryness modes Ceraseal Bioceramic sealer had the greatest bond strength among all sealers.
Regarding canal moisture for ceraseal adaption the more canal moisture the more adaption and bond strength.
Mta Fillapex showed the lowest bond strength and adaption with wet mode followed by paper point and alcohol mode.
Drying with ethanol for AH plus showed a significant higher bond strength than paper point and wet group.
Bio ceramic sealers showed good behavior in wet and normal condition while in dry mode showed sealer cracks.
AH plus and MTA fillapex showed good toleration on drying with alcohol better than wet condition.