Dentinogenesis imperfecta may overlap with which systemic condition in some types?

• A. Ehlers-Danlos.
• B. Osteogenesis imperfecta.
• C. Marfan.
• D. Down syndrome.

Answer: (B)

Dentinogenesis imperfecta often overlaps with systemic disorders that involve type I collagen, especially osteogenesis imperfecta. The link comes from shared biology: both bone and dentin rely on type I collagen as a major structural component. When mutations in the COL1A1 or COL1A2 genes disrupt this collagen, they can cause brittle bones in osteogenesis imperfecta and defective dentin formation in dentinogenesis imperfecta. Clinically, teeth are often opalescent and wear rapidly, reflecting the abnormal dentin, and DI can appear as part of the broader OI syndrome due to the common genetic pathway. While other connective-tissue disorders exist, the classic and well-established association with DI is osteogenesis imperfecta.