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Computed Tomography

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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Related Experiment Video

Updated: Jun 3, 2025

Scanning Electron Microscopic Evaluation of Surface Defects of Remover Retreatment File After Single and Multiple Uses

Scanning Electron Microscopic Evaluation of Surface Defects of Remover Retreatment File After Single and Multiple Uses

Published on: October 11, 2024

Comparative Retreatment Efficacy of Two Multi-File Systems with Different Access Cavity Designs: A Micro-Computed

Emine Odabaşı Tezer¹, Dilan Kırmızı², Mohamad Abduljalil³

¹Department of Endodontics, Faculty of Dentistry, Ankara University, Ankara 06560, Turkey.

Medicina (Kaunas, Lithuania)

|January 8, 2025

Summary

Neither conservative nor traditional access cavities, nor different ProTaper systems, significantly impacted root canal retreatment effectiveness. However, specific combinations showed varied remaining obturation material percentages.

Keywords:

access cavity design instrumentation micro-CT multi-file systems retreatment

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Published on: January 27, 2011

Area of Science:

Endodontics
Dental Materials Science

Background:

Root canal retreatment aims to remove obturation materials.
Access cavity design and instrumentation systems may influence retreatment efficiency.

Purpose of the Study:

To evaluate the efficiency of two multi-file systems in removing obturation materials.
To compare the effects of conservative (CAC) and traditional (TAC) access cavities on retreatment outcomes.
To utilize micro-computed tomography (micro-CT) for quantitative analysis.

Main Methods:

80 mandibular premolars were prepared and obturated.
Samples were divided into CAC and TAC groups, then further into eight subgroups based on retreatment systems (ProTaper Next and ProTaper Ultimate).
Micro-CT scans quantified remaining obturation material before and after retreatment.

Main Results:

Access cavity design (p=0.500), ProTaper system (p=0.138), and their interaction (p=0.513) had no significant effect on remaining material.
Group 3 (TAC and PTN) had the highest percentage of remaining material (29.53%).
Group 6 (CAC and PTR + PTUL) showed a lower percentage of remaining material.

Conclusions:

Complete removal of obturation materials was not achieved by any tested retreatment procedure.
Access cavity design and multi-file systems showed no significant impact on the amount of residual root canal filling material.