Discussion
Which of the following can be used as casting material ?
I. Silicon rubber
II. Moulage
III. Wax
IV. Plaster of Paris
Answer: D
All four can be used, so the answer is I, II, III and IV.
Casting preserves three-dimensional impressions such as footprints, tyre marks and tool marks. Plaster of Paris and dental stone are the standard materials for impressions in soil. Silicone rubber casting compounds record fine detail in tool marks and on small surfaces. Moulage, a reversible gelatine-based material, and wax (or sulphur) are also used, for example for impressions in snow or on delicate surfaces.
The options leaving out plaster of Paris omit the most common casting material of all, and the others omit materials that are genuinely used.
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