Document Detail

A new method for evaluating the threshold of periodontal ligament mechanoreceptor by slow speed mechanical stimulation.
MedLine Citation:
PMID:  12941072     Owner:  NLM     Status:  MEDLINE    
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.
Kazuhiro Oki; Mai Hamanaka; Taro Arima; Shuhei Takahashi; Kouichi Hasegawa; Shogo Minagi
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Validation Studies    
Journal Detail:
Title:  Journal of periodontal research     Volume:  38     ISSN:  0022-3484     ISO Abbreviation:  J. Periodont. Res.     Publication Date:  2003 Oct 
Date Detail:
Created Date:  2003-08-27     Completed Date:  2003-11-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0055107     Medline TA:  J Periodontal Res     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  482-7     Citation Subset:  D; IM    
Department of Occlusal and Oral Functional Rehabilitation, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan.
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MeSH Terms
Analysis of Variance
Dental Stress Analysis / methods*
Least-Squares Analysis
Mechanoreceptors / physiology*
Periodontal Ligament / innervation*,  physiology*
Physical Stimulation / instrumentation,  methods*
Reproducibility of Results
Sensory Thresholds
Stress, Mechanical

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