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Sensory transduction in human teeth with inflamed pulps
O Ajcharanukul1, W Chidchuangchai, P Charoenlarp
1Department of Stomatology, Faculty of Dentistry, Srinakharinwirot University, Bangkok 10500, Thailand.
Journal of Dental Research
|January 13, 2011
Summary
Pulpal inflammation alters dentin sensitivity. Cold stimuli produced more pain, while negative pressure stimuli produced less pain in inflamed teeth, suggesting different sensory receptor responses to stimuli.
Area of Science:
- Dentistry
- Neuroscience
- Pain Research
Background:
- Dentin sensitivity is a common clinical concern.
- Cold and negative pressure stimuli are used to assess dentin sensitivity.
- Evidence suggests these stimuli may activate different sensory receptors.
Purpose of the Study:
- To investigate the effect of pulpal inflammation on dentin sensitivity to cold and negative hydrostatic pressure stimuli.
- To compare the responses to these stimuli in inflamed versus non-inflamed pulps.
Main Methods:
- Dentin was exposed in human premolars (n=14, ages 15-25).
- Stimuli (cold: 5°C, negative pressure: -300 mm Hg) were applied to etched dentin.
- Measurements were taken immediately after cavity preparation and after 7 days of gutta-percha filling to induce pulpal inflammation.
Main Results:
- Pulpal inflammation (indicated by increased pulpal blood flow) significantly increased pain from cold stimuli.
- Pulpal inflammation significantly decreased pain from negative pressure stimuli.
- This differential effect suggests distinct mechanisms for stimulus transduction.
Conclusions:
- Sensory receptors mediating cold-induced pain in dentin may not solely rely on outward fluid flow.
- The findings support the hypothesis that different stimuli activate distinct sensory pathways in the dental pulp.
- Pulpal inflammation differentially modulates the perception of pain evoked by cold and negative pressure stimuli.
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