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Updated: Aug 25, 2026

Place and Response Learning in the Open-field Tower Maze
Published on: October 28, 2015
Clinical response to a vacant post space
1University of Medicine and Dentistry of New Jersey, New Jersey Dental School, Newark 07103, USA. fishelge@umdnj.edu
Aim:
To report a case demonstrating a radiolucency of developing adjacent to an unfilled post space.
Summary:
A mandibular left first molar was root filled before post-space preparation. The tooth was restored coronally but the post space was left empty, and 14 months later, pain and furcal radiolucency developed. Cleaning, shaping, medicating and filling the post space resulted in the resolution of symptoms and healing of the radiolucency.
Key Learning Points:
Post space should be prepared under conditions of asepsis. A post space must not be allowed to remain empty when a tooth is restored.
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