The Open Dentistry Journal

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Evaluation of Fracture Resistance and Sites of Failure of Different Dowel Core Restorations: An In-Vitro Study

Manjeev Guragain1, *, Suraj Mathema2, Dinesh Rokaya3
1 Department of Dentistry, Tribhuvan University Institute of Medicine, Kathmandu, Nepal
2 Department of Prosthodontics and Maxillofacial Prosthetics, People’s Dental College and Hospital, Nayabazar, Kathmandu, Nepal
3 Department of Prosthodontics, Kathmandu University School of Medical Sciences, Dhulikhel, Nepal



Dowel Cores are often required in endodontically treated tooth to aid retention and resistance for a final prosthetic crown. Studies concerning the role of post-core systems on the fracture resistance with different dowel material remain controversial.


This experimental study aimed to investigate the fracture resistance strength and failure mode of 3 dowel systems (glass fiber, indirect resin, and prefabricated metal with resin core).


Twenty-one extracted human maxillary central incisors were first endodontically treated and then separated into 3 equal groups randomly;1st group consisted of glass fiber dowel, 2nd group consisted of indirect resin dowel, and 3rd group consisted of the prefabricated metal dowel. All specimens were restored with resin core and indirect resin crown. A testing force was applied with a universal testing machine (at 135 o angle) at 3 mm from the incisal edge of crown and forces were measured. Statistical tests were done using One-way ANOVA and Chi-square Test.


There was no significant difference (P-value >0.05) of the fracture resistance among glass fiber dowel, indirect resin dowel and pre-fabricated dowel with indirect resin crown. The prefabricated metal dowel had maximum fracture resistance (566 ±157.771 N) followed by Glass fiber dowel (541.047 ±199.571 N) and indirect resin dowel and post (444.550 ±139.788 N).


Glass fiber dowel, indirect resin dowel and prefabricated metal dowel with resin core and indirect resin crown systems showed statistically insignificant fracture strength values and mode of failure.

Keywords: Glass fiber dowel, Indirect resin dowel, Prefabricated metal dowel, Resin core, Indirect resin crown, Central incisor.

Article Information

Identifiers and Pagination:

Year: 2019
Volume: 13
First Page: 454
Last Page: 461
Publisher Id: TODENTJ-13-454
DOI: 10.2174/1874210601913010454

Article History:

Received Date: 30/08/2019
Revision Received Date: 25/10/2019
Acceptance Date: 05/12/2019
Electronic publication date: 31/12/2019
Collection year: 2019

© 2019 Guragain et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Dentistry, Tribhuvan University Institute of Medicine, Kathmandu, Nepal; Tel: 945475250; E-mail:

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