Sodium Channel Expression in Human Teeth

September 21, 2015 updated by: Michael Henry, The University of Texas Health Science Center at San Antonio
The human tooth pulp has many nerve fibers and is a common source of pain. This study examines nerve fibers within normal and painful samples and identifies changes that can contribute to the generation of pain.

Study Overview

Status

Completed

Conditions

Detailed Description

The human tooth pulp is a rich source of pain fibers and is a common site of pathology that is often accompanied by spontaneous and stimulus-induced lingering pain. A common treatment modality includes the extraction of the offending tooth diagnosed with irreversible pulpitis. Extracted teeth represent an abundant source of normal and diseased human nociceptors and the evaluation of these tissues represents a powerful model to study human pain mechanisms since the character of pain, pain levels, and response to stimuli can be documented prior to extraction.

The overall objective of this study is to correlate changes in the expression of Sodium Channels (NaCh) with clinical responses to hot and cold thermal stimuli, and the expression of the associated receptors/transducers responsible for receiving that stimulus in extracted teeth with severe and spontaneous pain. Teeth requiring extraction in the clinical setting will be used for this study.

The research questions are: 1.) To evaluate quantitatively the overall NaCh and Nav 1.3, 1.6, 1.7, 1.8 1.9 isoform expressions in nerves of normal teeth as compared to diseased teeth 2.) To evaluate quantitatively hot/cold VR1 and CMR1 receptor expression in nerves of normal teeth as compared to the nerves in the modality-specific pain groups of diseased teeth 3.) To investigate the ultrastructural localization of NaCh isoforms in different fiber types and at sites that may be involved in pain generation.

Study Type

Observational

Enrollment (Actual)

250

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Texas
      • San Antonio, Texas, United States, 78229
        • University of Texas Health Science Center, San Antonio Dental School

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

16 years to 80 years (Child, Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Healthy patients presenting to the dental clinic with an indication for extraction of their normal third molar(wisdom) teeth or diseased teeth that are associated with pain.

Description

Inclusion Criteria:

  • individuals 16-80 years old
  • normal third molar(wisdom)teeth
  • painful, diseased teeth requiring extraction

Exclusion Criteria:

  • individuals under age 16 or above age 80
  • pregnant females
  • prisoners
  • nonvital painful teeth

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Case-Control
  • Time Perspectives: Cross-Sectional

Cohorts and Interventions

Group / Cohort
Normal Teeth
Normal molar teeth
painful teeth
Painful molar teeth

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Sodium Channel (NaCh) expression in nerves of normal teeth compared to diseased teeth.
Time Frame: Immediately following extration of the tooth.
Ex vivo lab bench study utilizing extracted human teeth.
Immediately following extration of the tooth.

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Vanilloid receptor subtype-1 (VR1) and cold-and menthol-sensitive receptor-1(CMR1) expression in normal vs diseased teeth.
Time Frame: Immediately following extraction of tooth.
Ex vivo bench lab study utilizing extracted human teeth.
Immediately following extraction of tooth.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

The University of Texas Health Science Center at San Antonio

Investigators

  • Principal Investigator: Michael A. Henry, DDS, PhD, University of Texas Health Science Center at San Antonio, TX

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 2006

Primary Completion (Actual)

September 1, 2015

Study Completion (Actual)

September 1, 2015

Study Registration Dates

First Submitted

December 15, 2007

First Submitted That Met QC Criteria

December 15, 2007

First Posted (Estimate)

December 18, 2007

Study Record Updates

Last Update Posted (Estimate)

September 22, 2015

Last Update Submitted That Met QC Criteria

September 21, 2015

Last Verified

September 1, 2015

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • HSC20060051H

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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