Widening of periodontal ligament is seen in:
Widening of periodontal ligament is seen in

Osteosarcoma
Chondrosarcoma
Scleroderma
Trauma from occlusion

Obliteration of periodontal ligament space is seen in

Hypercementosis
Ankylosis
Hypofunction of teeth
Paget's disease
Hypercementosis
Osteosarcoma
Hypofunction of teeth
Paget's disease