الفهرس | Only 14 pages are availabe for public view |
Abstract Different levels of residual moisture in the root canal have been shown to alter the sealing properties of conventional and resin-based sealers. The quality of adhesion between root canal dentin and sealers may be also affected by the moisture condition of the root canals before filling procedures. Despite the fact that the perception of moisture may vary widely among clinicians, several manufacturers recommend that the root canals be maintained in a moist state to benefit from the hydrophilic properties of their sealers without providing exact clinical instructions for achieving the degree of residual moisture that is ideal for their products (74). The purpose of this study was to find whether the residual moisture had an effect on sealing ability using different mixture sealer types. In the present study seventy single canalled posterior human permanent teeth with mature apices were collected, where ten teeth were used as positive and negative control groups, the other sixty prepared teeth were divided into two main groups (n=30 teeth) according to level of moisture into dry and wet groups. Each group was later subdivided according to obturation system used into three sub-groups (n=10): Subgroup (1): was obturated by RealSeal SE system Subgroup (2): was obturated by EndoRez system. Subgroup (3): was obturated by AH Plus/Gutta percha. Apical seal was evaluated by dye extraction method using spectrophotometer Summary and conclusion 64 and the result showed the following: All the sealers used in the study showed significant difference between dry and wet moisture condition. In the dry canal condition it was found that the sealing ability of RealSeal SE/ Resilon was better than AH-Plus /Gutta percha, while no significant difference was observed between the other groups. In moist canal condition there was no significant difference between all the sealers. This study concluded the following: 1-Moisture condition of root canals at the time of obturation had a significant undesirable effect on leakage and sealing ability of both epoxy resin sealer (AH-plus) and methacrylate resin based sealers (RealSeal SE and EndoRez sealers). 2-The drying procedure is a critical step and should not be missed in endodontic treatment. All sealers exhibited their highest dye absorbance values under the wet canal condition. The present study recommended that: 1-Drying of the root canals prior obturation even with hydrophilic resin sealers as wet canal condition would represent extreme experimental scenarios that should be avoided in the clinical situation. 2-The results suggest that the RealSeal SE/Resilon root canal obturation system might provide better seal due to the ability of forming monoblock obturation. |