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In general, it is a layer which is underneath another layer, [2] so underlay is thus also used to describe many different surface-covering products. In vinyl flooring or "linoleum", the underlay is the thin layer of plywood that is fastened over the structural subfloor to create a uniform, smooth platform for the sheet vinyl. For laminated wood ...
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[3]: 136–137 Because patients' soft-tissue undercuts may be shallow or deep, impression materials vary in their rigidity in order to obtain an accurate impression. Rigid materials are used with patients with shallow undercuts, while elastic materials are used with patients with deep undercuts, as the material must be flexible enough to reach ...