Dentinogenesis imperfecta — opalescent gray-blue teeth with bulbous crowns.

DI type II (Shields classification) is an isolated autosomal-dominant dentin disorder caused by DSPP mutations. Classic findings: opalescent gray-blue-brown teeth, bulbous crowns with cervical constriction, obliteration of pulp chambers/canals, and crown fracture due to weak dentin-enamel junction. DI type I is associated with osteogenesis imperfecta; amelogenesis imperfecta primarily affects enamel, not dentin/pulp.