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as we begin our discussion of Class 2 inlays we again consider the permanence of gold castings and why they last because this is the greatest attribute by far of this type restoration I speak often of a friend Dr George Elsman who has been such a great influence on me and many others as a teacher of gold foil and castings these castings were made by him 43 years ago and you can see from this picture why refer to the effect of bracing the enamel when referring to lack of breakdown of margins when the gold is closely adapted to the tooth margins these castings were made with type 1 gold with a hardness of probably 75. so the surface is parked and the Finish is not as it was when the inlays were placed but the Integrity of the margins is remarkable why do gold castings last excellent margins can be produced that do not break down after years of service coefficients of expansion is similar to enamel occlusal wear is similar to enamel gold does not tarnish or corrode and well-fitting castin