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Computed Tomography01:10

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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Updated: Jun 22, 2026

Multimodal Approach to Assess Bone Regeneration and Scaffold Performance
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Hard-tissue debris accumulation analysis by high-resolution computed tomography scans.

Frank Paqué1, Andres Laib, Hanspeter Gautschi

  • 1Division of Preventive Dentistry, Periodontology, and Cariology, University of Zürich Center of Dental Medicine, Zürich, Switzerland. frank.paque@zzmk.uzh.ch

Journal of Endodontics
|July 2, 2009
PubMed
Summary

A new method using microcomputed tomography (microCT) quantifies hard-tissue debris after root canal instrumentation. This technique revealed significant debris accumulation, highlighting its potential for evaluating endodontic procedures.

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Biomaterials

Background:

  • Hard-tissue debris accumulation is a common, yet understudied, consequence of root canal instrumentation.
  • Effective assessment methods are crucial for understanding and mitigating this side effect.

Purpose of the Study:

  • To present and validate a novel method for quantifying hard-tissue debris in root canals using high-resolution microcomputed tomography (microCT).
  • To assess the volume of hard-tissue debris following root canal instrumentation without irrigation.

Main Methods:

  • Selection of mandibular molars (n=6) with specific root canal anatomy.
  • Quantification of debris volume using microCT by analyzing radiopaque material accumulation in 2mm segments of the mesial canal system.
  • Backscattered electron imaging to confirm the composition of debris as root dentin.

Main Results:

  • Microcomputed tomography scans confirmed debris composition consistent with root dentin.
  • An average of 29.2% (±14.5%) of the canal volume was filled with hard-tissue debris after instrumentation.
  • Three-dimensional reconstructions effectively visualized debris distribution throughout the canal system.

Conclusions:

  • The developed microCT-based method provides a suitable quantitative approach for assessing dentin debris accumulation.
  • This technique can be utilized to compare the efficacy of different instrumentation and irrigation protocols in managing hard-tissue debris.