Pulp and periapical tests
Cold, electric, percussion, palpation and imaging contribute different information. A sensibility response does not directly prove pulpal blood supply.
Understand
Sensibility testing, percussion, palpation, mobility, periodontal probing and radiographs probe different tissues and processes. A neural response is not a direct measurement of pulpal perfusion.
Assess
Test control teeth and repeat equivocal findings. Relate lingering thermal pain, tenderness to percussion, sinus tracts and periapical changes to separate pulpal and apical diagnoses.
Apply
Avoid diagnosing from one test. Recent trauma, immature teeth, calcification and restorations can alter responses; document uncertainty and reassess when the result would change treatment.
Key distinctions
Pulp tests have imperfect sensitivity and specificity. A recently traumatised immature tooth may fail to respond despite living tissue, and an adjacent tooth or metallic restoration can create a misleading electric response. Control teeth and repeated tests make an interpretation more credible. A sinus tract may be traced radiographically when appropriate to identify the true source.
Think through a case
A heavily restored tooth responds weakly to cold, but the adjacent tooth has a clear lingering response. Control teeth and a repeat test prevent wrong-tooth treatment.
The distinction to remember
Do not treat a single cold or electric test as a direct blood-flow measurement. False responses occur with trauma, calcification and restorations.
Test your recall
What does a cold test primarily measure?
Show answer
A neural response, not direct pulp vitality.