Final answer:
Widening of the periodontal ligament space is seen in trauma from occlusion and orthodontic tooth movement, but not in Scleroderma or Paget's disease.
Step-by-step explanation:
Widening of the periodontal ligament space is NOT seen radiographically in A. trauma from occlusion. B. orthodontic tooth movement. C. Scleroderma (systemic sclerosis). D. Paget's disease.
Widening of the periodontal ligament space refers to an increase in the space between the tooth root and the surrounding bone, which can be seen on a radiograph. In trauma from occlusion, excessive force on the teeth due to misalignment or clenching can cause the periodontal ligament space to widen. Similarly, during orthodontic tooth movement, the application of mechanical force to reposition teeth can cause temporary widening of the periodontal ligament space. However, in conditions like Scleroderma and Paget's disease, which affect the connective tissues and bones respectively, widening of the periodontal ligament space is not typically observed on radiographs.