A new method for evaluating the threshold of periodontal ligament mechanoreceptor by slow speed mechanical stimulation

Kazuhiro Oki, Mai Hamanaka, Taro Arima, Shuhei Takahashi, Kouichi Hasegawa, Shogo Minagi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Objectives: This study aimed to establish a reliable method for detecting the threshold for perception of force applied to tooth and to report the basic properties of force threshold in the normal dentition subjects. Background: The perception of mechanical stimulation exerted to tooth is formed by input from periodontal ligament mechanoreceptors and intradental mechanoreceptors. Periodontal ligament mechanoreceptors respond to a wide range speed of stimulus, whereas intradental mechanoreceptors are activated only by a rapid stimulation. Reliable properties of perception have not been reported because of the difficulties to regulate velocity and degree of the stimulus. Methods: Eighteen healthy subjects were observed in this study (mean age: 27.2 ± 5.7 years). A loading device to generate slow speed loading was fabricated and measured as follows: (i) the fluctuation of the force threshold within a day, (ii) day-to-day fluctuation, (iii) changes in the force threshold by a transient mechanical loading. Results: In the normal dentition, it was observed that the fluctuation within a day and day to day of the pressure sense showed no significant differences; however, a transient mechanical loading caused the sensitivity of the periodontal ligament to decrease significantly. Conclusions: The device examining the force threshold resulted from periodontal ligament mechanoreceptors was useful in evaluating the sensitivity of the periodontal ligament.

Original languageEnglish
Pages (from-to)482-487
Number of pages6
JournalJournal of Periodontal Research
Issue number5
Publication statusPublished - Oct 2003


  • Mechanical stimulation
  • Mechanoreceptor
  • Periodontium
  • Pressure sense

ASJC Scopus subject areas

  • Periodontics


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