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    Determination of a cone-beam CT low-dose protocol for root fracture diagnosis in non-endodontically treated anterior maxillary teeth

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    Authors
    Andraws Yalda, F.
    Theodorakou, Chrysoula
    Clarkson, R. J.
    Davies, J.
    Feinberg, L.
    Sengupta, A.
    Horner, K.
    Affiliation
    College of Dentistry, Hawler Medical University, Erbil, Iraq
    Issue Date
    2021
    
    Metadata
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    Abstract
    Objectives: The aim of this study was to determine a "low-dose protocol" which provides acceptable diagnostic accuracy for detection of root fractures in unrestored anterior maxillary teeth, using an ex vivo model. Methods: 48 maxillary anterior teeth, half with horizontal or oblique root fractures, were imaged using CBCT in an anthropomorphic model. Nine X-ray exposure combinations were used, including the manufacturer's standard ("reference") exposure and high-resolution settings ("HiRes"), by varying kV, exposure time, and rotation angle. Measurements of Dose Area Product (DAP) were recorded. Five dental radiologists assessed the scans for root fractures and judged image quality. Parameters of diagnostic accuracy were calculated, including area under the Receiver Operating Characteristic curve (Az). Objective measures of image quality were made at the same exposure combinations using an image quality phantom. Results: Although there was a significant linear relationship between DAP and mean Az, only the lowest DAP exposure combination had a mean Az significantly different to the reference exposure. There was no significant effect on other diagnostic accuracy parameters when using HiRes compared with the reference exposure. There was a significant positive relationship between DAP and contrast resolution. HiRes did not significantly improve contrast resolution and made a small improvement to spatial resolution. Conclusions: Scope existed for radiation dose reduction compared with the manufacturer's guidance. There was no improvement in diagnostic accuracy using HiRes settings. A cautious recommendation for this CBCT machine is that it is possible to achieve a dose reduction of about 20% compared with the reference exposure parameters.
    Citation
    Andraws Yalda F, Theodorakou C, Clarkson RJ, Davies J, Feinberg L, Sengupta A, et al. Determination of a cone-beam CT low-dose protocol for root fracture diagnosis in non-endodontically treated anterior maxillary teeth. Dentomaxillofacial Radiology. 2021 Sep 8;20210138.
    Journal
    Dentomaxillofacial Radiology
    URI
    http://hdl.handle.net/10541/624601
    DOI
    10.1259/dmfr.20210138
    PubMed ID
    34494874
    Additional Links
    https://dx.doi.org/10.1259/dmfr.20210138
    Type
    Article
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.1259/dmfr.20210138
    Scopus Count
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