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Dentinogenesis imperfecta is a genetic disorder that affects the development of dentin, the hard tissue beneath the enamel of the teeth. Among the various types of dentinogenesis imperfecta, type 2 is specifically characterized by the presence of dentinal abnormalities without significant involvement of other tissues such as enamel or cementum.

In type 2, individuals typically present with slightly discolored teeth—often a blue-gray or brown color—due to the dentin being affected while the enamel remains intact in terms of its structure. This differentiation is critical because it highlights that the issue is primarily within the dentin itself, distinguishing it from other types where additional dental structures are often impacted as well.

The other types, particularly type 1 and type 3, exhibit more systemic conditions related to osteogenesis imperfecta or structural and aesthetic concerns involving multiple tissues, which is not the case for type 2. Thus, this unique characteristic of dentin involvement in type 2 makes it stand out among the classifications of dentinogenesis imperfecta.