A novel ultrasonic tip for removal of filling material in flattened/oval-shaped root canals: a microCT study

Abstract

The aim of this study was to evaluate the influence of a novel ultrasonic tip as an auxiliary method for removing filling material from flattened/oval-shaped canals. The null hypothesis tested was that this method does not influence removing the filling material in flattened/oval-shaped canals. Forty-five mandibular incisors were selected and randomly divided into three experimental groups (n = 15) according to different protocols for removing root canal filling material. Group R: Reciproc R25/.08, Group RC: Reciproc R25/.08 + Clearsonic tip, and Group CR: Clearsonic tip + Reciproc R25/.08. The teeth were scanned pre and post-operatively by means of a micro-computed tomography system. Data were analyzed using non-parametric Kruskal-Wallis and Dunn tests (p < 0.05). The percentage of residual root canal filling material between the experimental groups was examined. Statistically significant differences between the experimental groups were found in the root canal. Group R had the highest percentage of residual root canal filling material when compared with Groups RC and CR. The lowest percentage of residual root canal filling material was observed in Group CR. In the apical third of the root canal, statistically significant differences were found between the different protocols. The use of the ClearSonic tip followed by the Reciproc 25/.08 file to remove filling material resulted in the lowest percentage of residuals in the whole root canal and in the apical third.

Verification of remaining filling materials in flattened/oval-shaped root canals after use of several endodontic retreatment protocols

“…Concerning rotatory and reciprocating instrumentation, this study observed lower residuals after endodontic retreatment compared to the use of manual and oscillatory instrumentation, in accordance with the results of Patil et al [12]. Regarding root canal thirds, Rivera-Peña et al [17] showed lower residual in the cervical third when ultrasonic instrumentation was used, the same was not seen in the middle and apical thirds.…”

“…Another finding observed was that the use of ultrasonic instrumentation did not eliminate completely the amount of residual in endodontic retreatment. Rivera-Peña et al [17] evaluated the inf luence of ultrasonic instrumentation as an auxiliary method for removing filling material from flattened/oval-shaped canals evidencing a higher presence of residuals in the group that did not use ultrasonic instrumentation. In contrast, Kaloustian et al [10] showed that the percentage of residual material was not significantly different among the groups regarding use of ultrasonic tips.…”

Effect of ultrasonic cleaning on the bond strength of fiber posts in oval canals filled with a premixed bioceramic root canal sealer

“…An evaluation of the post space preparation protocol showed that the debridement potential of the ultrasonic tips was superior to the rotary system; the technique positively influenced the bond strength of fiber post cemented in AHP sealed samples. The observation can be explained by the use of a new ultrasonic tip developed for the effective removal of filling material in oval canals [5]. The tips allowed for a conservative post space preparation [5] and favored the removal of filling material from the areas that the post drills could not touch [18], resulting in higher values of bond strength.…”

“…The observation can be explained by the use of a new ultrasonic tip developed for the effective removal of filling material in oval canals [5]. The tips allowed for a conservative post space preparation [5] and favored the removal of filling material from the areas that the post drills could not touch [18], resulting in higher values of bond strength. However, the bond strength values of BIOC sealed samples were not influenced by the method of post space preparation.…”

“…The remaining material reduces the area available for adhesion and affects the bond strength of the cemented fiber post [2][3][4]. The use of ultrasonic tips to prepare root canal walls removes the smear layer, leaves the dentin surface free of material residues, and enhances the bond strength of fiber posts, especially in canals with complex anatomies, such as the oval-shaped canals [5,6].…”