Advanced Dental Admission Test (ADAT)

Dentinogenesis Imperfecta is characterized by which of the following features?

1. Normal tooth color and shape

2. Autosomal dominant inheritance pattern

3. Minimal occlusal wear

4. Deeply pigmented roots

The correct answer is: Autosomal dominant inheritance pattern

Dentinogenesis Imperfecta is a genetic disorder that affects the development of dentin, the tissue underlying the enamel of teeth. The essential feature of this condition is its autosomal dominant inheritance pattern, which indicates that only one copy of the mutated gene from an affected parent can cause the disorder in offspring. This autosomal dominant trait explains why it often appears in multiple members of a family, reflecting its transmission through generations. In contrast, the other options do not align with the characteristics of Dentinogenesis Imperfecta. For instance, the condition is typically associated with discolored teeth that may appear blue, gray, or yellow, rather than normal tooth color. Furthermore, affected individuals experience significant occlusal wear due to the structural weakness of the enamel and dentin; thus, minimal occlusal wear is not characteristic of the condition. Deeply pigmented roots can also be misleading, as the roots may be affected but their pigmentation is not a defining feature of Dentinogenesis Imperfecta. Overall, the autosomal dominant inheritance is a key aspect that distinguishes this condition from other dental anomalies.