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The Regulation of Osteoprotegerin by Mechanical Stimulation

This study has been completed.
Sponsor:
ClinicalTrials.gov Identifier:
NCT00155311
First Posted: September 12, 2005
Last Update Posted: March 15, 2013
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Collaborator:
National Science Council, Taiwan
Information provided by (Responsible Party):
National Taiwan University Hospital
  Purpose
To test whether levels of OPG can be changed during orthodontic treatment. Alveolar bone samples will be collected from partially impacted third molars after orthodontic uprighting for different period of time in volunteers. In situ hybridization and immunohistochemistry analysis for OPG and RANKL will reveal their roles in this physiological process.

Condition Intervention Phase
Malocclusion Procedure: orthodontic treatment Phase 1

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Factorial Assignment
Masking: Single (Investigator)
Primary Purpose: Treatment

Further study details as provided by National Taiwan University Hospital:

Primary Outcome Measures:
  • OPG staining [ Time Frame: at most 7 days ]
    at 1, 3, 7 days after orthodontic force application on wisdom teeth, bone covering the tooth will be removed before taking the wisdom tooth out. The tissue section of the bone will be done with immunocytochemistry after de-calicification.


Enrollment: 10
Study Start Date: January 2005
Primary Completion Date: December 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: days after treatment
different days after orthodontic treament, samples will be taken.
Procedure: orthodontic treatment

Detailed Description:

Long treatment time is a major factor causing high fee for orthodontic treatment. Patients would have dental caries or periodontitis resulted from improper oral hygiene care during this long treatment period. Therefore, how to speed up the tooth movement which determines the duration of orthodontic treatment, can help more people to obtain good occlusion and esthetics. Orthodontic force on tooth induces bone resorption on the compression side and bone deposition on the tension side, thus bone remodels and then tooth moves. Bone resorption is a complex process. Osteoblasts play an important role during initiation of bone resorption.

Changes OPG expression of osteoblasts under mechanical stimulation can play a role in bone remodeling. In order to test this hypothesis, the following specific aims will be achieved:

  1. To test whether levels of OPG can be changed during orthodontic treatment. Alveolar bone samples will be collected from partially impacted third molars after orthodontic uprighting for different period of time in volunteers. In situ hybridization and immunohistochemistry analysis for OPG and RANKL will reveal their roles in this physiological process.
  2. To optimize the regulation by changing magnitude and frequency of pressure, and characterize the time table for these changes..
  Eligibility

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.


Ages Eligible for Study:   18 Years to 35 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • patients with two mandibular impaction third molars containing at least one mesially angular impaction with crown exposed to the oral cavity

Exclusion Criteria:

  • pregnancy or diseases with abnormal bone metabolism
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00155311


Locations
Taiwan
Department of Dentistry, National Taiwan University Hospital
Taipei, Taiwan
Sponsors and Collaborators
National Taiwan University Hospital
National Science Council, Taiwan
Investigators
Principal Investigator: Chung-Chen Yao, DDS, PhD National Taiwan University Hospital
  More Information

Responsible Party: National Taiwan University Hospital
ClinicalTrials.gov Identifier: NCT00155311     History of Changes
Other Study ID Numbers: 9361700741
First Submitted: September 8, 2005
First Posted: September 12, 2005
Last Update Posted: March 15, 2013
Last Verified: March 2013

Keywords provided by National Taiwan University Hospital:
orthodontic tooth movement
OPG
RANKL

Additional relevant MeSH terms:
Malocclusion
Tooth Diseases
Stomatognathic Diseases