Effect of cavity depth on dentine sensitivity in man

Area of Science:

• Dental research
• Biophysics
• Pain perception

Background:

• The enamel-dentine junction (EDJ) is a critical interface in human teeth.
• Understanding dentine sensitivity is crucial for dental treatments and pain management.

Purpose of the Study:

• To investigate whether dentine at the EDJ is more sensitive to hydrostatic pressure stimuli compared to deeper dentine.
• To compare pain responses and nerve activity at varying depths of dentine.

Main Methods:

• Cavities were prepared in human premolars, extending from the EDJ to deeper dentine.
• Hydrostatic pressure stimuli were applied, and pain intensity was recorded using a Visual Analog Scale (VAS).
• Intradental nerve action potentials were monitored to assess neural responses.

Main Results:

• Pain intensity and nerve action potentials generally increased as cavities were deepened into the dentine.
• Etched dentine elicited greater responses than unetched dentine.
• Negative hydrostatic pressures produced stronger responses than positive pressures.

Conclusions:

• Dentine near the EDJ did not demonstrate heightened sensitivity to hydrostatic pressure compared to deeper dentine.
• Dentine's compliance may influence its sensitivity to mechanical stimuli, warranting further investigation.