Remaining dentinal thickness after simulated post space preparation and the fit of prefabricated posts to root canal preparation shapes

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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References

Schwartz R, Jordan R. Restoration of endodontically treated teeth: the endodontist’s perspective, part 1. Endodontics: Colleagues for Excellence-AAE. 2004;spring/summer:1-6.

Can cement film thickness influence bond strength and fracture resistance of fiber reinforced composite posts?.

Clin Oral Investig. 2016; 20: 849-855

Retention of root canal posts: effect of cement film thickness, luting cement, and post pretreatment.

Oper Dent. 2015; 40: E149-E157

Micro-computed tomography of tooth tissue volume changes following endodontic procedures and post space preparation.

Int Endod J. 2009; 42: 1071-1076

Modern molar endodontic access and directed dentin conservation.

Dent Clin North Am. 2010; 54: 249-273

Stress-strain response in human dentine: rethinking fracture predilection in postcore restored teeth.

Dent Traumatol. 2004; 20: 90-100

A clinical and roentgenological study of 55 cases of root perforation.

Int Endod J. 1989; 22: 75-84

The impact of post space preparation with Gates-Glidden drills on residual dentin thickness in distal roots of mandibular molars.

JADA. 2004; 135: 903-909

Direct linear measurement of root dentin thickness and dentin volume changes with post space preparation: a cone-beam computed tomography study.

Contemp Clin Dent. 2018; 9: 77-82

Factors affecting retention of post systems: a literature review.

J Prosthet Dent. 1999; 81: 380-385

The endo-restorative interface: current concepts.

Dent Clin North Am. 2010; 54: 345-374

Direct or indirect post crowns to restore compromised teeth: a review of the literature.

Br Dent J. 2018; 224: 413-418

Treatment outcome of repaired root perforation: a systematic review and meta-analysis.

J Endod. 2015; 41: 1795-1804

A prospective study of the factors affecting outcomes of non-surgical root canal treatment, part 2: tooth survival.

Int Endod J. 2011; 44: 610-625

BusinessWire Global Endodontic Files Market 2020-2024. Technavio.

(Accessed July 15, 2020)

https://www.businesswire.com/news/home/20200422005468/en/

Current trends in use and reuse of nickel-titanium engine-driven instruments: a survey of endodontists in the United States.

J Endod. 2020; 46: 391-396

ISO 3630-1:2019 Dentistry-Endodontic instruments, Part 1:general requirements.

International Organization for Standardization,
2019

Prevalence and extent of long oval canals in the apical third.

Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2000; 89: 739-743

Survey of dentists to determine contemporary use of endodontic posts.

J Prosthet Dent. 2017; 117: 642-645

Anatomy of the pulp-chamber floor.

J Endod. 2004; 30: 5-16

Descriptive Anatomy of the Human Teeth.

SS White Dental Manufacturing Company,
1897

Crown and root lengths of incisors, canines, and premolars measured by cone-beam computed tomography in patients with malocclusions.

Korean J Orthod. 2013; 43: 271-278

The risk of perforation in the curved canal: anticurvature filing compared with the stepback technique.

Int Endod J. 1987; 20: 33-39

Parallel post-space preparation in different tooth types ex vivo: deviation from the canal centre and remaining dentine thickness.

Int Endod J. 2007; 40: 778-785

Correspondence between fiber post and drill dimensions for post canal preparation.

Am J Dent. 2017; 30: 295-298

Preferred reporting items for root and canal anatomy in the human dentition (PROUD 2020): a systematic review and a proposal for a standardized protocol.

Eur Endod J. 2020; 5: 159-176

The impact of post preparation on the residual dentin thickness of maxillary molars.

J Prosthet Dent. 2011; 106: 184-190

Residual dentin thickness in bifurcated maxillary first premolars after root canal and post space preparation with parallel-sided drills.

J Prosthet Dent. 2008; 99: 267-273

A combined radiographic and computerized scanning method to evaluate remaining dentine thickness in mandibular incisors after various intracanal procedures.

Int Endod J. 2003; 36: 682-686

Reinforcement of simulated immature roots restored with composite resin, mineral trioxide aggregate, gutta-percha, or a fiber post after thermocycling.

J Endod. 2011; 37: 1390-1393

Success rates of prosthetic restorations on endodontically treated teeth; a systematic review after 6 years.

J Oral Rehabil. 2013; 40: 618-630

Do metal post-retained restorations result in more root fractures than fiber post-retained restorations? A systematic review and meta-analysis.

J Endod. 2015; 41: 309-316

Evaluation of fiber posts vs metal posts for restoring severely damaged endodontically treated teeth: a systematic review and meta-analysis.

Quintessence Int. 2019; 50: 8-20

Impact of adhesive surface and volume of luting resin on fracture resistance of root filled teeth.

Int Endod J. 2011; 44: 432-439

Influence of post fit and post length on fracture resistance.

Int Endod J. 2009; 42: 47-53

A systematic review of dowel (post) and core materials and systems.

J Prosthodont. 2009; 18: 464-472

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

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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