Impact of hypomineralised second primary molar on preschoolers' oral health–related quality of life—A hierarchical approach

Background Hypomineralised second primary molar (HSPM) is a developmental enamel defect associated with dental caries. Aim To evaluate the impact of HSPM on oral health–related quality of life (OHRQoL) in preschoolers through hierarchical analysis. Design This population‐based cross‐sectional study assessed 834 5‐year‐old preschoolers, in Teresina, Piauí, Brazil, using sociodemographic questionnaires and Early Childhood Oral Health Impact Scale (ECOHIS). Dental examination was performed by two calibrated examiners (κ ≥ 0.80) for the diagnosis of HSPM (EAPD), dental caries (dmft and pufa indices), and malocclusion (Foster and Hamilton criteria). Analysis of the determinants of OHRQoL was stratified at three levels (P