Abstract
Multiple tooth impaction and retarded dental eruption are common symptoms of systemic disorders such as cleidocranial dysostosis, hypothyroidism, osteogenesis imperfecta, and rickets etc. We investigate d a case in which multiple permanent teeth had not erupted without general systemic disorders. The patient (a ten-year-old boy) visited the Pedodontic Clinic of Osaka University Dental School Hospital, because of prolonged retention of primary teeth and tardy eruption of permanent teeth.
