Which condition is NOT commonly associated with loss of lamina dura?

• A. Paget's disease
• B. Hyperparathyroidism
• C. Osteomalacia
• D. Dental caries

Answer: (D)

Loss of the lamina dura is a radiographic finding that can indicate various underlying conditions affecting the bone, particularly around the teeth. Dental caries primarily result in localized destruction of tooth structure and can lead to the loss of the tooth itself if left untreated, but they do not directly cause changes in the lamina dura.

In contrast, the other conditions listed are associated with systemic changes in bone metabolism. Paget's disease leads to abnormal bone remodeling, which can result in changes to the lamina dura. Hyperparathyroidism causes increased osteoclastic activity, leading to bone resorption and potential loss of the lamina dura. Osteomalacia involves impaired bone mineralization, which can also affect the integrity of the lamina dura. Thus, dental caries stands out as it does not usually influence the lamina dura, making it the correct choice for this question.