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Sensory and reflex responses to tooth pulp stimulation in man
Brain Research
|August 20, 1976
Summary
Not all tooth pulp nerves transmit pain signals. Research indicates some afferent nerves may not produce pain, with sensory and reflex responses likely originating from the same nerve fibers.
Area of Science:
- Neuroscience
- Dental Research
- Pain Perception
Background:
- Tooth pulp afferent nerves are crucial for sensory input.
- Understanding their role in pain is essential for effective dental analgesia.
Purpose of the Study:
- To investigate if all tooth pulp afferent nerves can elicit pain.
- To differentiate sensory and reflex responses to nerve stimulation.
Main Methods:
- Human subjects received monopolar and bipolar electrical stimulation of teeth.
- Sensory thresholds were determined.
- Electromyography (EMG) of masseter and anterior digastric muscles was recorded.
Main Results:
- Stimulation up to three times sensory threshold showed no digastric muscle response.
- At or just above sensory threshold, masseter muscle exhibited inhibitory effects.
- Muscle response latency was 18-22 msec with bipolar stimulation.
- Stimulation did not cause pain, despite eliciting sensations.
Conclusions:
- Some pulpal afferent nerves may not be capable of producing pain.
- Sensory and reflex responses at threshold likely involve the same nerve fibers.
- This challenges the assumption that all afferent nerves in the tooth pulp are pain-producing.