Premium
Micro‐Computed Tomography of Tooth Volume Changes Following Post Removal
Author(s) -
Kim Jiyeon J.,
Alapati Satish,
Knoernschild Kent L.,
Jeong YongHoon,
Kim Do Gyoon,
Lee Damian J.
Publication year - 2017
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.12442
Subject(s) - gutta percha , materials science , dentistry , glass ionomer cement , significant difference , post hoc , cement , statistical analysis , volume (thermodynamics) , orthodontics , root canal , medicine , composite material , mathematics , statistics , physics , quantum mechanics
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 (mm 3 ). 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.