Short-term stress relaxation of porcine periodontal ligament - finding an appropriate visco-elastic model

Roisin Tohill, M. R. Hien, M R McGuinness, L Chung, R. L. Reuben

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


Findings are presented here from a prototype palpation device for making load-displacement measurements, intended ultimately for in vivo use on humans. Here, the device is applied in vitro to a number of pig-jaws to assess its ability to distinguish visco-elastic properties of the PDL.

Four jaws were tested, each test consisting of the application of a series of step displacements to the second mandibular premolar, and allowing the stress to relax over a period of up to 35 seconds. The resulting stress relaxation curves are lit to a number of simple visco-elastic models to assess the most appropriate method of assessing short- and medium-term visco-elastic properties. The results indicate that four-parameter models give significantly better results than three-parameter models and that the time of testing is critical in determining longer time-constant effects.

Original languageEnglish
Title of host publicationWorld Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany
Subtitle of host publicationVol. 25/11 Biomedical Engineering for Audiology, Ophthalmology, Emergency and Dental Medicine
EditorsOlaf Dössel, Wolfgang C Schlegel
Number of pages4
ISBN (Electronic)978-3-642-03891-4
ISBN (Print)978-3-642-03890-7
Publication statusPublished - 2009
EventWorld Congress on Medical Physics and Biomedical Engineering - Munich, Germany
Duration: 7 Sep 200912 Sep 2009

Publication series

NameIFMBE Proceedings
ISSN (Print)1680-0737


ConferenceWorld Congress on Medical Physics and Biomedical Engineering


  • tooth displacement
  • periodontal ligament
  • Visco-elastic models

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