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

Masahiro Iikubo, Toyohiro Kagawa, Junya Fujisawa, Akira Kumasaka, Takashi Nishioka, Ikuho Kojima, Maya Sakamoto, Kaoru Kobayashi, Kenji Yuasa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)344-348
Number of pages5
JournalOral Radiology
Volume36
Issue number4
DOIs
Publication statusPublished - 2020 Oct 1

Keywords

  • Artifact
  • Cone-beam computed tomography
  • Root canal filling
  • Tube current
  • Tube voltage

ASJC Scopus subject areas

  • Dentistry (miscellaneous)
  • Radiology Nuclear Medicine and imaging

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