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Either self adhesive or normal sheet wax can be used for covering the saddle area.
Cut the boundary with a scalpel to leave a sharp edge. This gives the acrylic better retention to the metal framework when the denture is finished. Adapt a wax spacer of approx. 0.2 mm under the sublingual bar!
Always integrate a stop into the lower, free-end saddle area of a partial denture! This keeps the metal framework stable during the finishing stage!
It is not necessary to melt self adhesive sheet wax to the plaster model. Block-out undercuts resulting from scarring and tooth extraction with wax beforehand.