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
Identifiers and Pagination:Year: 2013
First Page: 162
Last Page: 168
Publisher Id: TODENTJ-7-162
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
open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
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.