American Board of Orthodontics (ABO) Practice Exam

AI Type 1C, which refers to Amelogenesis Imperfecta Type 1C, typically presents with a more generalized defect in enamel formation. In this condition, all teeth are affected, and the severity of the enamel deficiency is notably pronounced across the dental arch. Patients with this type often experience significant enamel hypoplasia, resulting in a range of issues such as increased susceptibility to caries, sensitivity, and aesthetic concerns.

The characteristic feature of AI Type 1C is that it does not restrict its impact to a few selected teeth or just the incisors; rather, it manifests in all teeth more severely than other types. This comprehensive involvement is what distinguishes it from forms of amelogenesis imperfecta that may affect only specific groups of teeth or exhibit variable severity among them. Consequently, the features of AI Type 1C include a consistent and widespread presence of enamel hypoplasia across both primary and permanent dentition.

This understanding helps clarify how the disorder impacts overall oral health and treatment considerations for affected individuals.