Accidentally Extruded Calcium Hydroxide Into a Cystic Lesion Associated With an Adjacent Tooth-A Case Report.

A rare case of pulp necrosis and apical resorption of a second premolar, caused by a cystic lesion from a first molar, led to calcium hydroxide extrusion. CBCT imaging, combined with clinical and historical findings, enabled accurate assessment of the lesion, resorption extent, and extruded material to guide treatment.