Micro-CT evaluation of sonically and ultrasonically activated irrigation on the removal of hard-tissue debris from isthmus-containing mesial root canal systems of mandibular molars

The aim of this study was to compare the percentage of non-instrumented area of root canals prepared with different enlargements using single-file reciprocating systems (Reciproc and WaveOne) and a conventional multi-file rotary (BioRaCe) system by micro-computed tomographic analysis. Thirty mesial roots of mandibular molars with moderate curvature (10° to 20°) presenting a type II Vertucci canal configuration and similar internal volume were chosen and scanned at an isotropic resolution of 14.16 µm. The sample was assigned to 3 groups (n=10) according to the system used for root canal preparation: Reciproc, WaveOne, and BioRaCe groups. Second and third scans were taken after the canals were prepared with instruments sizes 25 and 40, respectively. The recorded images of the surface area voxels of the canals, before and after preparation were examined from the furcation level to the apex to quantify the non-instrumented surface. Statistical data were compared using GLM for repeated-measures with a significance level set at 5%. Instrumentation systems did not influence the percentage of untouched root canal surfaces (p=0.690) whilst a significant reduction in the percentage of static voxels was observed after the enlargement of the root canal (p=0.010) in all groups (p=0.507). None of the systems was able to prepare the entire surface area of the mesial root canal of mandibular molars. The increased final apical size resulted in a significant positive effect on the shaping ability of the tested systems.

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Three-dimensional modeling and measurements of root canal anatomy in second primary mandibular molars: a case series micro CT study

European Archives of Paediatric Dentistry ◽

10.1007/s40368-019-00426-8 ◽

2019 ◽

Vol 20 (5) ◽

pp. 457-465 ◽

Cited By ~ 3

Author(s):

C. El Hachem ◽

M. K. Kaloustian ◽

W. Nehme ◽

N. Ghosn ◽

J. C. Abou Chedid

Keyword(s):

Root Canal ◽

Three Dimensional ◽

Case Series ◽

Second Primary ◽

Micro Ct ◽

Mandibular Molars ◽

Three Dimensional Modeling ◽

Dimensional Modeling ◽

Root Canal Anatomy

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Micro-CT Evaluation of Root Filling Removal after Three Stages of Retreatment Procedure

Brazilian Dental Journal ◽

10.1590/0103-6440201300061 ◽

2015 ◽

Vol 26 (6) ◽

pp. 612-618 ◽

Cited By ~ 11

Author(s):

Ricardo Abreu da Rosa ◽

Manuela Favarin Santini ◽

Bruno Cavalini Cavenago ◽

Jefferson Ricardo Pereira ◽

Marco Antônio Húngaro Duarte ◽

...

Keyword(s):

Root Canal ◽

Filling Material ◽

Micro Ct ◽

Micro Computed Tomography ◽

Root Canal Filling ◽

Tomography System ◽

Filling Materials ◽

Ct Evaluation ◽

Ah Plus ◽

Post Hoc

The aim of this study was to quantify the residual filling material after filling removal, re-preparation with rotary or reciprocating files and passive ultrasonic irrigation (PUI). Twenty maxillary molars were prepared using ProTaper instruments up to F1. The teeth were filled with AH Plus and ProTaper gutta-percha points using the single-cone technique. Thereafter, the specimens were scanned using a micro-computed tomography system (Micro-CT #1). Then, the root canal filling was removed using ProTaper Retreatment files, and a new scan was performed (Micro-CT #2). The specimens were divided into two groups according to the instrument used for re-preparation: ProTaper rotary or WaveOne reciprocating files (Micro-CT #3). Finally, PUI was performed, and a new micro-CT scan was performed (Micro-CT #4). Intragroup and intergroup analyses were performed using Friedman and Dunn's post hoc test and the Kruskal-Wallis and Dunn post hoc tests, respectively. Palatal canal presented the highest volume of residual filling material in all stages of endodontic retreatment (p<0.05). The main reduction of filling volume was achieved after using ProTaper Retreament (p<0.05). The amount of remaining filling material after using ProTaper Retreatment was similar to that achieved with rotary and reciprocating files and after PUI (p>0.05). Rotary and reciprocating files achieved similar removal of the root canal filling (p>0.05). The greatest reduction in filling material was achieved after using ProTaper Retreatment files. Rotary and reciprocating instruments and PUI did not improve the removal of root canal filling materials.

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