Australian Dental Council (ADC) Test 2025 – 400 Free Practice Questions to Pass the Exam

The condition characterized by the absence of lamina dura in radiographs typically manifests with bone changes that lead to alterations in the appearance of the dental structures.

Paget's disease leads to an irregular and enlarged bone structure, which often results in the disappearance of the lamina dura due to the disorganized bone remodeling. Similarly, fibrous dysplasia presents with radiographic findings that lack the normal integrity of the lamina dura, as the fibrous tissue replaces normal bone.

Hyperparathyroidism is associated with changes in bone density and typically presents with resorption of the lamina dura on radiographs, often highlighted by a condition known as brown tumors, which are osteitis fibrosa cystica.

In contrast, hyperthyroidism does not typically feature changes in the lamina dura in the same way these other conditions do. While hyperthyroidism can affect bone turnover and remodeling, it does not directly influence the radiographic appearance of the lamina dura. Therefore, it is not characterized by its absence on radiographs, making it the correct choice for this question.