A patient presents with lingering, prolonged pain to cold stimulation and tenderness to percussion. What is the most likely pulpal diagnosis?

Symptomatic irreversible pulpitis is characterized by spontaneous or lingering pain that persists after removal of the thermal stimulus (especially cold). Tenderness to percussion indicates periapical inflammation secondary to pulpal infection spreading through the apex. In contrast, reversible pulpitis produces a sharp, transient pain that resolves quickly when the stimulus is removed. Pulp necrosis typically shows no response to thermal testing. The AAE classification distinguishes symptomatic from asymptomatic irreversible pulpitis; this presentation is symptomatic because the patient has pain complaints.