Use of micro-CT to examine effects of heat on coronal obturation

Ivy Shen, Joan Daniel, Kali Vo, Chul Ahn, Carolyn Primus, Takashi Komabayashi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Purpose: The aim of this study was to categorize the effects of heat on cor-onal obturation with gutta-percha and sealer using X-ray micro-computed tomography (micro-CT). Methods: Ten single-rooted, extracted human teeth were shaped using ProTaper NEXT files to size X5 (#50/Taper 6%) with 2.5% NaOCl irriga-tion. A single ProTaper NEXT X5 gutta-percha point was then inserted with epoxy resin (AH Plus) or tricalcium silicate (EndoSequence BC) sealer (n = 5/group), and cut at the cemento-enamel junction. The teeth were scanned using micro-CT (SkyScan1272) to obtain 11 sagittal 2-D images. Three calibrated raters categorized the coronal 0.5 mm of the images into four categories: “swirled sealer and/or gutta-percha without voids” (I), “uniform voids and sealer/gutta-percha” (II), “non-uniform voids and sealer/gutta-percha” (III), and “swirled sealer and/or gutta-percha with voids” (IV). Intra-rater and inter-rater reliability were then calculated. Chi-square tests were conducted to determine the significance of differences in each category between sealers. Results: The intra-class correlation coefficient was 0.55 (same rater/two different times) and Fleiss’ kappa (different raters/same image) was 0.34. Categories I, II, III, and IV accounted for 16.4%, 4.2%, 30.3%, and 49.1% for AH Plus, and 6.7%, 4.2%, 27.3%, and 61.8% for EndoSequence BC, respectively. Conclusion: Category IV was most common and Category II the least common. Significant differences were evident between sealers for Category I (P < 0.01).

Original languageEnglish (US)
Article numberjosnusd/22-0013
Pages (from-to)224-227
Number of pages4
JournalJournal of Oral Science
Issue number3
StatePublished - Jul 2022


  • endodontic sealers
  • epoxy resin
  • heat
  • micro-CT
  • tricalcium silicate

ASJC Scopus subject areas

  • Dentistry(all)


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