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Related Experiment Video

Updated: Jan 25, 2026

Assessment of Nerve Injury-Induced Mechanical Hypersensitivity in Rats Using an Orofacial Operant Pain Assay
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How May Placebo Mechanisms Influence Orofacial Neuropathic Pain?

L Vase1, L Baad-Hansen2,3, M Pigg3,4

  • 11 Department of Psychology and Behavioural Sciences, School of Business and Social Sciences, Aarhus University, Aarhus, Denmark.

Journal of Dental Research
|May 16, 2019
PubMed
Summary

Placebo effects are psychoneurobiological phenomena influencing pain processing, not just bias. Understanding these effects is crucial for orofacial neuropathic pain diagnosis and treatment.

Keywords:
cognitionfacial painneuralgiaplacebo effectrandomized controlled trialtreatment outcome

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Area of Science:

  • Neuroscience
  • Psychology
  • Pain Management

Background:

  • The understanding of placebo has evolved from inactive treatments to recognizing the impact of patient perception on pain and outcomes.
  • Significant placebo effects observed in chronic neuropathic pain warrant investigation into their role in orofacial neuropathic pain.

Purpose of the Study:

  • To review the definition, magnitude, and mechanisms of placebo effects in pain, particularly neuropathic pain.
  • To explore the applicability of placebo mechanisms to orofacial neuropathic pain, a developing research area.
  • To discuss how understanding placebo effects can enhance the diagnosis and treatment of orofacial neuropathic pain.

Main Methods:

  • Literature review of placebo effects in pain, focusing on neuropathic and orofacial neuropathic pain.
  • Analysis of social, psychological, neurobiological, and genetic mechanisms underlying placebo responses.
  • Examination of the influence of patient perception, healthcare provider relationships, and treatment expectations on outcomes.

Main Results:

  • Placebo effects are measurable psychoneurobiological phenomena, not merely response bias.
  • Patient perception, provider interaction, and emotional/expectational factors significantly influence treatment outcomes.
  • Orofacial neuropathic pain, particularly following trigeminal nerve injury, may be highly susceptible to placebo factors.

Conclusions:

  • Placebo mechanisms offer valuable insights for improving the understanding, diagnosis, and therapeutic strategies for orofacial neuropathic pain.
  • Consideration of placebo effects is essential for accurate assessment and treatment in orofacial neuropathic pain research and clinical practice.
  • Applying knowledge of placebo mechanisms presents both opportunities and challenges in evaluating dental treatments for neuropathic pain.