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What is "Chicken-wire" appearance of enlarged bone marrow spaces is seen in: and explain in detail?
In the jaws in beta thalassemia, there is generalized rarefraction of alveolar bone, thinning of cortical bone, and a “chicken-wire” appearance of enlarged marrow spaces and coarse trabeculation. 
In some cases, the lamina dura may be thin, the roots of the teeth short, and the premaxilla prominent.

Poynton HG: Oral radiology, Baltimore, 1982, Williams & Wilkins, Page: 230-232.