Somatosensory abnormalities in atypical odontalgia: A case-control study

Area of Science:

• Neuroscience
• Pain Research
• Oral Medicine

Background:

• Persistent idiopathic orofacial pain, such as atypical odontalgia (AO), has poorly defined somatosensory characteristics.
• Understanding these sensory alterations is crucial for diagnosing and managing AO.

Purpose of the Study:

• To investigate and compare somatosensory function between patients with atypical odontalgia (AO) and healthy controls.
• To test the hypothesis that AO patients exhibit greater somatosensory abnormalities.

Main Methods:

• Recruited 46 AO patients and 35 age/sex-matched controls.
• Utilized qualitative sensory testing and intraoral quantitative sensory testing (QST).
• Included specific inclusion criteria for AO diagnosis, such as persistent pain and absence of clinical/radiological findings.

Main Results:

• 85% of AO patients showed qualitative somatosensory abnormalities versus 14% of controls (P<0.001).
• Significant differences in intraoral QST, including mechanical detection/pain thresholds and dynamic mechanical allodynia, were observed (P<0.01).
• Complex hypersensitivity and hyposensitivity patterns were noted in AO patients' somatosensory profiles.

Conclusions:

• Atypical odontalgia is associated with significant intraoral somatosensory dysfunction.
• Findings suggest peripheral and central sensitization of trigeminal pathways in AO.
• Generalized nociceptive system sensitization may contribute to AO pathophysiology.