tooth abnormalities Aberrant root formation 1 Child 1 DNA methylation 1 Female 1 Hertwig's epithelial root sheath 1 Humans 1 Incisor 1 Radiography 1 Tooth Root 1 case report 1 child 1 dental enamel hypoplasia 1 dental trauma 1 diagnostic imaging 1 epigenetic mechanism 1 epigenomics 1 female 1 growth, development and aging 1 human 1 incisor 1 injuries 1 molar incisor hypomineralization 1 radiography 1 tooth root 1 young permanent tooth 1