The Open Dentistry Journal

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Influence of Different Post-Core Systems on Impact Stress: a Pilot Study

Yoshihiro Kondoh1, Tomotaka Takeda2, *, Takamitsu Ozawa2, Keishiro Narimatsu2, Michiyo Konno2, Toshiki Fujii2, Chieko Sekiguchi2, Kazunori Nakajima2, Keiichi Ishigami 2, Masahito Shomura3, 4
1 Department of General Dentistry, Tokyo Dental College Chiba Hospital
2 Department of Sports Dentistry, Tokyo Dental College
3 Department of Pediatric Dentistry, Matsumoto Dental University School of Dentistry
4 Division of Oral Health Promotion, Matsumoto Dental University Graduate School


This pilot study compared impact strain at the core and root surfaces between two different post-core systems.

Materials and Methods:

The form of a bovine mandibular front tooth was modified to resemble that of a human maxillary incisor as a test specimen. A cast post and core (Metal PC) and composite resin and glass fiber-reinforced epoxy resin post (Fiber-Resin PC) system were tested. Four gauges were affixed to the buccal and lingual surfaces of the core and root. The specimens were then embedded in a metal mold using dental stone. A pendulum-type device with a pyramid-shaped metal impact object with a titanium alloy head was used to provide 2 different shock forces. Maximum distortion was measured and analyzed.


Distortion at the core at each measurement point and total amount of distortion with Fiber-Resin PC was significantly greater (p<0.05) than that with Metal PC against both impact forces. On the other hand, distortion at the root at the buccal measurement point with Fiber-Resin PC was significantly less than that with Metal PC against both impact forces. Total distortion was significantly less with Fiber-Resin PC than that with Metal PC against the greater impact shock. Acceleration with Fiber-Resin PC was significantly less than that with Metal PC against both impact forces.


Fiber-Resin PC has the potential to protect remaining root against traumatic force. This suggests that a Fiber-Resin PC is more suitable for non-vital teeth against not only occlusal but also traumatic impact force.

Keywords: : Acceleration, distortion, glass fiber-reinforced epoxy resin post, impact force, post-core system, root.

Article Information

Identifiers and Pagination:

Year: 2013
Volume: 7
First Page: 162
Last Page: 168
Publisher Id: TODENTJ-7-162
DOI: 10.2174/1874210601307010162

Article History:

Received Date: 20/8/2013
Revision Received Date: 21/10/2013
Acceptance Date: 23/10/2013
Electronic publication date: 29 /11/2013
Collection year: 2013

© Kondoh et al.; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Department of Sports Dentistry, Tokyo Dental College, 1-2-2, Masago, Mihama-ku, Chiba, 261-8502, Japan; Tel: +81432703605; Fax: +81432703609; E-mail:

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