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Related Experiment Video

Updated: May 26, 2026

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Tracing toothache intensity in the brain.

M Brügger1, K Lutz, B Brönnimann

  • 1University of Zürich, Center of Dental Medicine, Clinic for Removable Prosthodontics, Masticatory Disorders and Special Care Dentistry, Plattenstrasse 11, Zürich 8032, Switzerland. michael.bruegger@uzh.ch

Journal of Dental Research
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

This study mapped brain responses to tooth pain intensity using fMRI. Specific brain regions, including the anterior insula and cingulate cortex, showed linear correlations with pain, aiding understanding of nociception.

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Area of Science:

  • Neuroscience
  • Pain Research
  • Neuroimaging

Background:

  • Understanding trigeminally mediated nociception is crucial for pain management.
  • Identifying brain regions that respond to varying pain intensities can enhance our knowledge of pain processing.

Purpose of the Study:

  • To analyze cortical responses to electrical stimulation of a human maxillary canine tooth at varying intensities.
  • To identify specific brain regions involved in coding toothache intensity.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to capture hemodynamic responses.
  • Electrical stimulation of graded strengths was applied to a canine tooth, from painless to painful levels.
  • Participants rated evoked sensations on a visual analog scale.

Main Results:

  • A cerebral network corresponding to the lateral and medial nociceptive system was identified.
  • Positive linear correlations between stimulus intensity and brain activity were found in the anterior insula (bilaterally) and contralateral anterior mid-cingulate and pregenual cingulate cortices.
  • These findings indicate specific subregions within the cortical pain network are responsible for coding toothache intensity.

Conclusions:

  • Specific subregions within the brain's pain network, including the anterior insula and parts of the cingulate cortex, are involved in coding toothache intensity.
  • This research contributes to a better understanding of trigeminal nociception and brain mechanisms of pain.