An alternative technique for macroscopic retention is a non-etching method that utilize a cast mesh pattern on the inner surface of the retainers to produce roughness before alloy is cast.
The mesh is a kind of net made of nylon that is placed over lingual surface of abutment teeth on the working cast. It is then covered by wax or resin, with the undersurface of the retainer becoming mesh-like when retainer is cast.
All the process must to be done carefully to prevent occluding the mesh with the pattern material. With Cast Mesh technique non etching method after casting is needed due to the use of noble-metal alloys.
Cast Mesh is a technique sensitive that provides adequate retention with a resulting thick lingual casting, which was followed by investing and casting process, a method by which a wax pattern of a restoration can accurately duplicate its shape and anatomic features to be converted to a replicate in dental alloy.
The Cast Mesh and the Virginia Salt method have been supplanted by direct adhesion with resin, which is possible for most casting alloys if the correct surface treatment is provided.