Abstract
Background
Post space preparation can increase the risk of experiencing perforation and root
fracture. The authors assessed remaining dentin thickness after post space preparation
and the fit of different prefabricated posts to root canal preparation systems in
a theoretical model.
Methods
Ten datasets per type of tooth from cone-beam computed tomography were analyzed to
determine the minimum root diameter from 5 through 13 mm from the apical foramen.
The preparation shapes of 10 root canal preparation systems were calculated and compared
with the root dimensions to determine the remaining dentin thickness. Eight post brands
were compared with root dimensions to determine the areas where there was less than
1 mm dentin thickness.
Results
The average root canal preparation shape produced canal diameters of 0.57 mm at 5
mm from the canal terminus and 0.94 mm at 13 mm from the canal terminus. The mean
post size tip diameter was 1.03 mm, which is larger than the dimensions of the average
canal preparation. Post preparation would result in less than 1 mm of dentin thickness
remaining in premolars, smaller roots of molars, and mandibular incisors. The area
with less than 1 mm of dentin thickness was around the post tip.
Conclusions
Endosequence Fiber Post (Brasseler USA), RelyX Fiber Post 3D (3M), and Rebilda (VOCO)
were the better fitting posts with the root canal preparation shapes.
Practical Implications
Many posts would result in less than 1 mm dentin thickness. Clinicians should use
posts that fit their root canal preparations to minimize dentin removal.
Key Words
Endodontic files
endodontics
post and core
prosthodontics
endodontic therapy
post and core technique
root canal
Abbreviation Key:
CEJ (Cementoenamel junction), D0 (Apical size of root canal preparation instrument), Dx (Diameter (in mm) of the instrument at position x, where x is the distance (in mm)
from the tip of the instrument), dx (Diameter (in mm) of the post at position x, where x is the distance (in mm) from the
tip of the instrument), MB (Mesiobuccal canal), Md (Mandibular), MRD (Minimum root diameter), Mx (Maxillary), N/A (Not applicable), P (Palatal canal), T (Taper), T0-8 (Taper prepared from 0 through 8 mm from the apical end of the post), T5-9 (Taper prepared from 5 through 9 mm from the apical end (mm/mm)), T9-13 (Taper prepared from 9 through 13 mm from the apical end), v (Variable taper)
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Biography
Dr. Ha is an endodontic resident, Adelaide Dental School, University of Adelaide, Adelaide, South Australia, Australia
Biography
Dr. Chaves is a PhD student of endodontics, School of Dentistry, Federal University of Goias, Goiania, Brazil.
Biography
Dr. Decurcio is an associate professor of endodontics, School of Dentistry, Federal University of Goias, Goiania, Brazil.
Biography
Dr. Estrela is the chairman of endodontics, School of Dentistry, Federal University of Goias, Goiania, Brazil.
Biography
Dr. Peters is a professor and discipline lead, endodontics, School of Dentistry, University of Queensland, Brisbane, Australia.
Biography
Dr. Rossi-Fedele is a professor of endodontics, Adelaide Dental School, University of Adelaide, Adelaide, South Australia, Australia.
Article Info
Publication History
Published online: October 13, 2021
Accepted:
June 22,
2021
Received in revised form:
May 30,
2021
Received:
February 23,
2021
Publication stage
In Press Corrected Proof
Footnotes
Disclosure. Dr Peters serves as a consultant for Dentsply Sirona. None of the other authors reported any disclosures.
The authors acknowledge Dentsply Sirona for the use of licenses of their software, particularly 3D Endo. The authors also acknowledge the product managers from Kavo Kerr, Dentsply Sirona, Coltene Whaldent, and EdgeEndo who provided the details of their rotary files.
Identification
DOI: https://doi.org/10.1016/j.adaj.2021.06.014
Copyright
(C) 2021 American Dental Association. All rights reserved.
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