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  • Title: Micro-Computed Tomography Assessment of Apical Accessory Canal Morphologies.
    Author: Xu T, Tay FR, Gutmann JL, Fan B, Fan W, Huang Z, Sun Q.
    Journal: J Endod; 2016 May; 42(5):798-802. PubMed ID: 26975416.
    Abstract:
    INTRODUCTION: The morphologic features of accessory canals (ACs) were investigated by using micro-computed tomography technique with a centerline fitting algorithm. METHODS: Ninety-three 3-mm-long apical root segments with unobstructed ACs were scanned by micro-computed tomography at 2.5-μm scanning resolution. After automatic segmentation, a centerline of the reconstructed lateral canal was developed, and the diameter, length, shape, and undulation of ACs were analyzed along the centerline. RESULTS: Of 178 unobstructed ACs identified, the median diameter was 67.0 μm, the average length was 786.6 μm, the predominant shape was oval, and the undulation was tortuous rather than straight. CONCLUSIONS: The diameter, length, shape, and undulation may vary among ACs in particular from the pulpal space to the external root surface, which may complicate the debridement of the ACs.
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