A patient shows signs of improperly formed DEJ and reduced size of pulp chamber. What condition is likely present?

The presence of improperly formed dentin-enamel junction (DEJ) and a reduced size of the pulp chamber suggests a condition related to the formation and structure of dental tissues, particularly dentin. Dentinogenesis imperfecta is a genetic disorder that affects the development of dentin, leading to compromised structural integrity. This condition typically results in teeth that have an irregular DEJ and a smaller pulp chamber due to abnormal dentin formation.

In individuals with dentinogenesis imperfecta, the teeth often exhibit characteristics such as a bulbous crown, opalescent coloration, and increased fragility, which can further contribute to the compromised appearance and functionality of the teeth. The reduced size of the pulp chamber is a direct consequence of the abnormal dentin, as the formation of healthy dentin is essential for maintaining normal pulp chamber dimensions.

The other conditions listed do not primarily affect the DEJ or lead to reduced pulp chamber size in the same manner. Fluorosis is related to excessive fluoride exposure during tooth development and typically manifests as discoloration or mottling of the enamel rather than changes in dentin or pulp size. Amelogenesis imperfecta affects enamel formation specifically, without direct involvement in dentin structure. Chronic periodontitis concerns the supporting structures around teeth,