Dentinogenesis imperfecta (DGI) is a hereditary dentin defect characterized by abnormal dentin structure resulting in abnormal tooth development. The disease is Monarch Disease Ontology term MONDO_0018849 (dentinogenesis imperfecta). Also known as: DGI, DGI without OI, DI, dentinogenesis imperfecta (disease), dentinogenesis imperfecta without osteogenesis imperfecta, non-syndromic DGI, non-syndromic dentinogenesis imperfecta, opalescent teeth without OI.