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      Sealing efficacy of system B versus Thermafil and Guttacore obturation techniques evidenced by scintigraphic analysis

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          This study compared root canal sealing ability, filled by Continuous Wave compaction and two carrier-based obturation systems, using the nuclear medicine approach.

          Material and Methods

          Fifty-five single-rooted extracted teeth were selected. The crowns were sectioned and each tooth was instrumented using rotary Protaper® Universal system. The roots were divided into 3 experimental groups and two control groups. Forty-five root canals were filled, using Continuous Wave, GuttaCore or Thermafil system and TopSeal sealer. Ten teeth were used as control. On the 7th days the apices were submersed in a solution of sodium pertechnetate 99mTc for 3 hours and the radioactivity was counted.


          Although apical leakage in the Continuous Wave group was lower compared with GuttaCore and Thermafil groups, there was no statistical difference ( p>0.05).


          System B, GuttaCore and Thermafil techniques showed a similar sealing effect.

          Key words:Continuous wave compaction, Gutta percha core-carrier, leakage, nuclear medicine.

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          Most cited references 21

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          Factors affecting the long-term results of endodontic treatment.

          The influence of various factors that may affect the outcome of root canal therapy was evaluated in 356 patients 8 to 10 yr after the treatment. The results of treatment were directly dependent on the preoperative status of the pulp and periapical tissues. The rate of success for cases with vital or nonvital pulps but having no periapical radiolucency exceeded 96%, whereas only 86% of the cases with pulp necrosis and periapical radiolucency showed apical healing. The possibility of instrumenting the root canal to its full length and the level of root filling significantly affected the outcome of treatment. Of all of the periapical lesions present on previously root-filled teeth, only 62% healed after retreatment. The predictability from clinical and radiographic signs of the treatment-outcome in individual cases with preoperative periapical lesions cases was found to be low. Thus, factors which were not measured or identified may be critical to the outcome of endodontic treatment.
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            Assessment of a new root canal sealer's apical sealing ability.

             Wei Zhang,  Zhi Li,  Bin Peng (2009)
            The aim of this study was to investigate the apical sealing ability of a newly introduced root canal sealer: iRoot SP Root Canal Sealer. Sixty-eight extracted human anterior single-root teeth were used. The coronal part of each tooth was removed and the root canals were prepared with ProTaper files. The specimens were divided into 3 groups of 20 teeth each. Group A specimens were filled with iRoot SP using the continuous wave condensation technique; Group B specimens were obturated with iRoot SP using a single cone technique; Group C specimens were filled with AH plus by means of the continuous wave condensation technique. Evaluation of the apical leakage was performed with a fluid filtration method at 24 hours and 1, 4, and 8 weeks. Scanning electron microscopy (SEM) was used to qualitatively assess what mechanisms might be responsible for leakage of the different groups. There was no significant difference in fluid leakage among the groups, as well as no time effect on leakage (P > .05). SEM revealed both gap-free regions and gap-containing regions in canals filled with both materials. iRoot SP was equivalent to AH Plus sealer in apical sealing ability.
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              Outcome of root canal obturation by warm gutta-percha versus cold lateral condensation: a meta-analysis.

              The purpose of this study was to evaluate clinical outcome differences of root canal obturation by warm gutta-percha (GP) or cold lateral condensation (CLC) through a systematic review and meta-analysis. There were 10 clinical studies evaluated. Postoperative pain, long-term outcomes, obturation quality, and overextension were the characteristics investigated. The results suggest that the two obturation techniques are not significantly different except in overextention. The relative risk (RR) value of warm GP versus CLC and 95% confidence interval (CI) of the first three criteria were 1.10 (0.71, 1.71), 0.78 (0.58, 1.05), and 1.31 (0.98, 1.76), respectively. Overextension was more likely to occur in the warm GP obturation group in comparison with the CLC group. The RR value and 95% CI were 1.98 (1.33, 2.93). In conclusion, warm GP obturation demonstrated a higher rate of overextension than CLC. Postoperative pain prevalence, long-term outcomes, and obturation quality were similar between the two groups.

                Author and article information

                J Clin Exp Dent
                J Clin Exp Dent
                Medicina Oral S.L.
                Journal of Clinical and Experimental Dentistry
                Medicina Oral S.L.
                1 January 2017
                January 2017
                : 9
                : 1
                : e56-e60
                [1 ]PhD, Department of Dentistry, Faculty of Medicine, University of Coimbra, Portugal
                [2 ]PhD, Department of Biophysics and Biomathematics, IBILI-Faculty of Medicine, University of Coimbra, Portugal
                [3 ]DDS, Department of Dentistry, Faculty of Medicine, University of Coimbra, Portugal
                Author notes
                Department of Dentistry Faculty of Medicine, University of Coimbra Av. Bissaya Barreto - Blocos de Celas 3000 Coimbra, Portugal , E-mail: m.mferreira@ 123456netcabo.pt

                Conflict of interest statement:The authors declare that they have no conflict of interest.

                Copyright: © 2017 Medicina Oral S.L.

                This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                Operative Dentistry and Endodontics


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