Micro-Computed Tomography of Tooth Volume Changes Following Post Removal

Jiyeon J. Kim, Satish Alapati, Kent L. Knoernschild, Yong Hoon Jeong, Do Gyoon Kim, Damian J. Lee

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Purpose: To measure tooth volume change before and after post removal using micro-CT and to compare the difference among various combinations of prefabricated post and cement systems. Materials and Methods: Forty-eight extracted maxillary anterior teeth and mandibular canines were sectioned 13 mm from the apex. Root canals were properly instrumented. Preparations were filled with gutta percha using lateral condensation. Post space was prepared with a touch and heat device, leaving 5 mm of gutta percha from the apex. Specimens were scanned with micro-CT to establish objective baseline volume and divided into two groups of post systems: stainless steel (SS) ParaPost and glass-fiber reinforced composite (FRC) post. Half the posts for each group were cemented with Ketac Cem radiopaque glass-ionomer cement, and the other half with SpeedCEM dual-curing resin cement. The posts and residual cement were removed by the same operator, using the ultrasonic vibration technique under an endodontic operating microscope. The remaining tooth root structure was scanned again using micro-CT with volume reported (mm3). The statistical difference between the combination of posts and cements was measured using the Kruskal-Wallis ANOVA test (α = 0.001). The independent variables were evaluated separately using post hoc Tukey examination to determine which groups resulted in a statistically significant difference. Results: There was a statistical difference of tooth root volume change among the groups. Post hoc exam revealed a statistically significant difference in tooth root volume change between group 1 (SS + GI) and the other groups (α = 0.0002). Conclusion: Compared to other post and cement combinations, serrated parallel-sided SS posts cemented with GI cement had the most tooth root structure loss upon post removal using the ultrasonic vibration technique.

Original languageEnglish (US)
Pages (from-to)522-528
Number of pages7
JournalJournal of Prosthodontics
Issue number6
StatePublished - Aug 2017
Externally publishedYes


  • Tomography
  • canal
  • endodontic
  • post removal
  • post space

ASJC Scopus subject areas

  • General Dentistry


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