Micro-Computed Tomography Assessment of Apical Accessory Canal Morphologies

Area of Science:

• Endodontics
• Dental Morphology
• Biomaterials Science

Background:

• Accessory canals (ACs) are complex anatomical structures in teeth.
• Understanding AC morphology is crucial for effective endodontic treatment.
• Previous investigations often lacked detailed morphologic analysis.

Purpose of the Study:

• To investigate the morphologic features of accessory canals (ACs).
• To analyze the diameter, length, shape, and undulation of ACs.
• To provide data for improving endodontic debridement strategies.

Main Methods:

• Micro-computed tomography (micro-CT) at 2.5-μm resolution was used.
• Ninety-three 3-mm-long apical root segments with unobstructed ACs were analyzed.
• A centerline fitting algorithm was employed for quantitative analysis.

Main Results:

• 178 unobstructed ACs were identified and analyzed.
• Median AC diameter was 67.0 μm; average length was 786.6 μm.
• ACs were predominantly oval-shaped with tortuous, rather than straight, undulations.

Conclusions:

• AC morphology (diameter, length, shape, undulation) exhibits significant variability.
• The tortuous and variable nature of ACs may present challenges during root canal debridement.
• Further research into AC morphology can inform clinical practices.