Abstract:
The purpose of this study was to investigate the amount of sodium hypochlorite extrusion from root canal when using the EndoActivator® with different apical preparation sizes compared to the conventional irrigation method. 100 extracted human maxillary anterior teeth with mature apices were instrumented and divided into 3 groups (30 teeth/group) based on the 3 different apical sizes: #35, #50, #80. Each tooth was fixed in agarose gel and irrigated with both needle (NG) and EndoActivator© (EA) techniques. The data of apical extrusion is collected in 2 parts, which are color changed detection and weight difference of model. Differences in apical extrusion volumes were analyzed by Kruskal-Wallis test (p < 0.05). In positive control group and models with increasing weights, the color change of agarose gel was observed from colorless to blue color. On the other hand, there was no color change in negative control group and in teeth with apical preparation of size #35 that corresponded to the result of no weight change. When root canal was prepared to apical size #35, weight change was not observed in both NG and EA groups. However, the extrusion volume was increasing when apical preparation size increased regardless of irrigation technique used. There were significant difference in extrusion volume among root canals with apical size #50 and 80 in NG and EA groups However, there was no significant difference between root canal with apical size #50 in NG group and apical size #80 in EA group (p>0.05). In conclusion, the apical extrusion depended on apical preparation size and irrigating systems. When increased in apical preparation size, amount of NaOCl extrusion was greater. There was few amount of apical extrusion when using EndoActivator®. Although, apical extrusion volume in EndoActivator® using was greater when increased in apical preparation size, the extrusion was less in EndoActivator® system when compared with needle and syringe irrigation.
