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Spark erosion: a sophisticated technique to solve a difficult problem.

Even with the most careful planning, situations arise that require sophisticated treatment alternatives. The Milled Bar, of which the spark erosion bar is one type, is described in detail. A two-degree tapered meso (primary) bar with anterior friction pins attached to osseointegrated implants provides frictional retention when supporting a secondary bar with swivel lock attachments. The two components of the prosthesis are accurately associated with each other using spark erosion and plasma arc welding technology.