Biological Markers in the Gingival Crevicular Fluid Associated with External Invasive Resorption: A Split-Mouth Cross-Sectional Study.

Introduction: This study aimed to investigate the levels of interleukin-1 receptor antagonist (IL-1RA), receptor activator of nuclear factor-κB ligand (RANKL), osteoprotegerin (OPG), interleukin-1β, osteopontin, and tissue necrotizing factor-α in teeth with external invasive resorption (EIR) in comparison to the contralateral healthy tooth of the same patient.

Methods: Twenty-nine patients with at least one tooth with EIR and a healthy tooth on the contralateral side (33 paired teeth) were included. Data on patient demographics and medical and dental history were collected.