Abstract
BackgroundThe objective of the present micro-computed tomography (micro-CT) study was to assess the presence of voids in band-shaped isthmuses obturated using three different filling techniques.MethodsTwenty-four artificial molar teeth with a band-shaped isthmus were allocated to three groups (n = 8) for obturation, according to the filling technique: single-cone (SC), continuous wave of condensation (CWC) or lateral condensation (LC). Obturation was performed with gutta-percha (GP) cones and iRoot SP (Innovative Bioceramix, Vancouver, Canada). Post-filling micro-CT scanning was performed. The percentage of filling materials and void volumes were calculated in the isthmus areas and data were analyzed using one-way ANOVA and Tukey tests.ResultsThe mean percentage of void volumes and corresponding filling percentages in the isthmus areas after obturation in the SC groups was 22.98 % ± 1.19 %, 77.02 % ± 1.19 %; in the CWC groups 10.46 % ± 2.28 %, 89.54 % ± 2.28 %; and in the LC groups was 13.14 % ± 1.85 %, 86.86 % ± 1.85 %, respectively.ConclusionsIn band-shaped isthmus area, the obturation quality of CWC was superior to SC and LC techniques.
Highlights
The objective of the present micro-computed tomography study was to assess the presence of voids in band-shaped isthmuses obturated using three different filling techniques
Because the point of this study focused on the bandshape isthmus present in the apical 5 mm region of the mesial root, in each specimen, the volume of the filling and voids in the isthmus were measured, and the percentage of voids and filling were calculated
Analysis of micro-CT three dimensions (3D) reconstructions revealed the mean volume of voids in the focused area after obturation in the SC, continuous wave of condensation (CWC), and lateral condensation (LC) groups was 0.23436, 0.10668, and 0.13394 mm3 respectively, with percentage values of 22.98 % ± 1.19 %, 10.46 % ± 2.28 %, and 13.14 % ± 1.85 % (Fig. 2)
Summary
The objective of the present micro-computed tomography (micro-CT) study was to assess the presence of voids in band-shaped isthmuses obturated using three different filling techniques. Apart from the proper cleaning and shaping of the root canal, adequate obturation of the root canal system is required after biomechanical procedures, to ensure the long-term success of endodontic treatment [2]. It is difficult to achieve this goal because of anatomical complexities of the root canal system and limitations in current preparation and filling techniques [3, 4]. An isthmus ( termed as a lateral interconnection, corridor, or transverse anastomosis) is a narrow, ribbon-shaped communication between two root canals [4, 9, 10]. A band-shaped isthmus is defined as a band-shaped corridor between root canals starting from the level where two canals merge (isthmus roof ) and extending to the
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