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Optical approach for monitoring the periodontal ligament changes induced by orthodontic forces around maxillary anterior teeth of white rats

  • Jihoon Na
  • Byeong Ha Lee
  • Jae Ho Baek
  • Eun Seo Choi
Original Article

Abstract

Structural variations of the periodontal ligament (PDL) induced by orthodontic forces have been evaluated by optical coherence tomography (OCT) and compared to images obtained by conventional radiography. Here, two specially designed orthodontic appliances were installed on the maxillary anterior teeth of white rats for applying different magnitudes of orthodontic forces. Constant distraction force magnitudes of 0, 5, 10, and 30 gf were given to four respective rats over a period of 5 days. At the end of the treatment period, the rats were sacrificed and the maxillaries were extracted for X-ray and OCT imaging. The PDL variations, proportional to the force magnitude, were clearly indicated in the OCT measurements. The OCT images further showed that the ligament was torn for a constant orthodontic force of 30 gf. These results support the clinical dental application of OCT for monitoring the ligament changes during orthodontic procedures. The real-time imaging capability of OCT, together with its high resolution, has the potential to help dentists with in vivo orthodontic treatments in human subjects as well.

Keywords

Optical coherence tomography Periodontal ligament Periodontium Dentistry Medical optics instrument Clinical application 

Abbreviations

OCT

Optical coherence tomography

PDL

Periodontal ligament

SD

Sprague–Dawley

Notes

Acknowledgments

This work was supported in part by the Ministry of Commerce, Industry and Energy of Korea through the Industrial Technology Infrastructure Building Program and by the Advanced Technology Center (ATC) project of the Ministry of Commerce Industry and Energy (MOCIE).

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Copyright information

© International Federation for Medical and Biological Engineering 2008

Authors and Affiliations

  • Jihoon Na
    • 1
  • Byeong Ha Lee
    • 1
  • Jae Ho Baek
    • 2
  • Eun Seo Choi
    • 3
  1. 1.Department of Information and CommunicationsGwangju Institute of Science and Technology (GIST)GwangjuSouth Korea
  2. 2.Department of Orthodontics, Division of DentistryUlsan University Hospital UlsanSouth Korea
  3. 3.Department of PhysicsChosun UniversityGwangjuSouth Korea

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