Pre-Eruptive Intra-Coronal Resorption (PIER) Lesion Shown in Impacted Second Premolar (Case Report)

Pre-eruptive intra-coronal resorption (PIER) is a defect found in the dentin of an unerupted tooth, located just beneath the dentin-enamel junction. It has an estimated prevalence of PIER 0.5-2% of teeth. The severity of the lesion can vary from small to large in size, which may extend to the pulp. Historically, these defects were mistaken for caries and referred to as "hidden caries or pre-eruptive caries", which are described as intra-follicular decay. PIER is typically discovered incidentally during routine examinations by dental X ray radiographs. Previous studies have reported that in the pre-eruptive phase, these lesions contain soft tissue and inflammatory cells. This report presents a clinical case of PIER in a mandibular second impacted permanent molar.