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Effect of exposure parameters and gutta-percha cone size on fracture-like artifacts in endodontically treated teeth on cone-beam computed tomography images

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Abstract

Objectives

To ascertain the effects of exposure parameters (tube current and tube voltage) and the gutta-percha cone (GPC) size on root fracture-like artifacts obtained with cone-beam computed tomography (CBCT).

Methods

Fracture-like artifacts appearing on CBCT images of nine extracted human mandibular premolars filled with GPCs of size #50 or #80 were analyzed using six exposure factors: two tube voltages (80 kV and 110 kV); and three tube currents (4 mA, 7 mA, and 10 mA). On axial images, the gray value (GV) was recorded at three points: the mesiobuccal portion (MBP) as the sound dentin, the mesial portion (MP) as the artifact line, and the water area (WA). The rate of decrease in the GV (RDGV) of the artifact line was calculated using the formula: RDGV (%) = (GV of MBP − GV of MP) × 100/(GV of MBP − GV of WA).

Results

Comparison of the #80 group and the #50 group with equal tube voltages and tube currents shows that artifact lines in the #80 group were more obvious than those in the #50 group. The artifact lines with 80 kV were markedly more visible than those with 110 kV for each tube current and GPC size. Tube current changes did not affect the artifact line for any tube voltage or GPC size.

Conclusions

For the reduction of artifacts, we recommend selection of higher tube voltages and lower tube currents when taking CBCT images of teeth with each GPC size.

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Acknowledgements

This work was supported in part by a Grant-in-Aid for Project Research from the Japanese Association for Dental Science (no. 16K15810) and Research Center for Biomedical Engineering (2035).

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Authors and Affiliations

  1. Division of Oral Diagnosis, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan

    Masahiro Iikubo, Junya Fujisawa, Akira Kumasaka, Takashi Nishioka, Ikuho Kojima & Maya Sakamoto

  2. Department of Diagnostic and General Care, Fukuoka Dental College, 2-15-1 Tamura, Sawara-ku, Fukuoka, 814-0193, Japan

    Toyohiro Kagawa & Kenji Yuasa

  3. Department of Oral and Maxillofacial Radiology and Diagnosis, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, 230-8501, Japan

    Kaoru Kobayashi

Authors
  1. Masahiro Iikubo
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  2. Toyohiro Kagawa
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  3. Junya Fujisawa
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  4. Akira Kumasaka
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  5. Takashi Nishioka
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  6. Ikuho Kojima
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  7. Maya Sakamoto
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  8. Kaoru Kobayashi
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  9. Kenji Yuasa
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Correspondence to Masahiro Iikubo.

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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. Informed consent was obtained from all patients for being included in the study.

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This study did not use any animal.

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Iikubo, M., Kagawa, T., Fujisawa, J. et al. Effect of exposure parameters and gutta-percha cone size on fracture-like artifacts in endodontically treated teeth on cone-beam computed tomography images. Oral Radiol 36, 344–348 (2020). https://doi.org/10.1007/s11282-019-00411-3

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  • DOI: https://doi.org/10.1007/s11282-019-00411-3

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