A 14.7-year-old young adult with severe osteogenesis imperfecta (OI) type I without dentinogenesis imperfecta (DGI; patient no. 1). The panoramic radiograph shows one congenitally missing tooth in the right upper jaw (the site of the missing germ marked with a circle) and invagination of an upper right premolar (continuous arrow). Premolars with dens evaginatus or other malformations are marked with broken arrows. One premolar in the upper left jaw had been extracted due to crowding