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Detection Thresholds for Root Canal Visibility on High-Resolution CBCT: A Micro-CT Validation Study.

Kheya Patel1, Feng-Ming Wang1, Mehrnaz Tahmasbi1

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This summary is machine-generated.

High-resolution cone-beam computed tomography (CBCT) can reliably detect root canals around 300 micrometers. Canals smaller than 200 micrometers are often missed, impacting dental assessments.

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Area of Science:

  • Dentistry
  • Radiology
  • Endodontics

Background:

  • Cone-beam computed tomography (CBCT) is essential for evaluating root canal anatomy.
  • Establishing precise size thresholds for confident canal detection in CBCT remains a challenge.

Purpose of the Study:

  • To determine the relationship between root canal diameter and the probability of confident detection using high-resolution CBCT.
  • To establish practical size thresholds for canal visibility on CBCT, using micro-CT as a reference standard.

Main Methods:

  • Sixty-one human teeth were imaged using both micro-CT and CBCT.
  • Canal diameters from micro-CT were correlated with CBCT cross-sections.
  • Three observers assessed canal visibility on CBCT, with detection probability modeled using logistic regression and ROC analysis.

Main Results:

  • Excellent interobserver agreement (κ=0.78-0.91) was achieved.
  • Confident detection probability reached 70% at ~265 μm, 80% at ~299 μm, and 90% at ~350 μm.
  • Receiver operating characteristic analysis showed high discriminative accuracy (AUC=0.89).

Conclusions:

  • Consistent root canal visibility on 80-μm-voxel CBCT is achieved at approximately 300 μm.
  • Canals between 200-300 μm are often visible, while those <200 μm are frequently missed.
  • These thresholds aid clinicians in anticipating radiographically undetectable but patent canals.