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Information Journal Paper

Title

Micro-CT Evaluation of Gutta-Percha Removal by Two Retreatment Systems

Pages

  221-227

Abstract

 Introduction: The aim of the present ex vivo research was to compare the remaining filling material and the volumes of dentine removed after retreatment of curved canals with two rotary systems naming ProTaper Universal Retreatment and Mani NRT-GPR using micro-computed tomography (micro-CT). Methods and Material: Forty mandibular molars containing two completely separated canals, with curvature angle of 25-35° and a curvature radius <10 mm were prepared to the Mtwo instrument 35/0. 04 and filled with warm Gutta-Percha and AH-Plus sealer. The teeth were randomly divided into 2 groups (n=20), according to the retreatment system evaluated: ProTaper Universal Retreatment (PR group) or Mani NRT-GPR (MR group). Retreatment was considered complete when the working length was reached and when smooth dentinal walls were observed, with no evidence of filling material adhered to instruments or in the irrigating solution. Preoperative and postoperative micro-CT images were obtained with an isotropic voxel size of 11. 88 μ m to observe the volume of residual filling material in the canals and dentine removed after retreatment. Statistical analysis was performed by Student’ s t-test (P<0. 05). Results: The mean percentage of remaining filling material was 12. 96% for PR group and 24. 26% for MR group (P=0. 0056). The percentage of dentin removal was greater in the PR group (5. 02%) than MR group (1. 36%) (P=0. 0028). Both systems failed to completely remove the filling material from the canals. Conclusion: ProTaper Universal Retreatment system was more effective than Mani NRT-GPR system regarding removal of root filling material and also removed significantly more dentine after retreatment of curved mesial root canals of mandibular molars.

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    APA: Copy

    Alberto Rubino, Gustavo, Taccio de Miranda Candeiro, George, Gonzales Freire, Laila, Faga Iglecias, Elaine, Mello Lemos, Erico de, Luiz Caldeira, Celso, & GAVINI, GIULIO. (2018). Micro-CT Evaluation of Gutta-Percha Removal by Two Retreatment Systems. IRANIAN ENDODONTIC JOURNAL (IEJ), 13(2), 221-227. SID. https://sid.ir/paper/303052/en

    Vancouver: Copy

    Alberto Rubino Gustavo, Taccio de Miranda Candeiro George, Gonzales Freire Laila, Faga Iglecias Elaine, Mello Lemos Erico de, Luiz Caldeira Celso, GAVINI GIULIO. Micro-CT Evaluation of Gutta-Percha Removal by Two Retreatment Systems. IRANIAN ENDODONTIC JOURNAL (IEJ)[Internet]. 2018;13(2):221-227. Available from: https://sid.ir/paper/303052/en

    IEEE: Copy

    Gustavo Alberto Rubino, George Taccio de Miranda Candeiro, Laila Gonzales Freire, Elaine Faga Iglecias, Erico de Mello Lemos, Celso Luiz Caldeira, and GIULIO GAVINI, “Micro-CT Evaluation of Gutta-Percha Removal by Two Retreatment Systems,” IRANIAN ENDODONTIC JOURNAL (IEJ), vol. 13, no. 2, pp. 221–227, 2018, [Online]. Available: https://sid.ir/paper/303052/en

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