IN MANY INSTANCES tissue loss can only be satisfactorily corrected by introducing new material in the form of implants or grafts to the defective site. Organic and artificial implants have been used in medicine for several decades with varying degrees of success. Autografts, homografts, and heterografts have not been uniformly successful because of problems associated with absorption and host response; while artificial substances either produce unwanted tissue reactions or are difficult to use. When silicones were introduced into medicine in 1950, they were considered to be the most promising material so far developed as they apparently produced no tissue reaction, repelled water, blood, and most organic tissue and were available in forms that permitted their use in a variety of sites. Many articles describing their use have appeared; most of these reported highly satisfactory results, but, as with all new techniques, experience must modify our initial enthusiasm. Silicone-rubber implants are
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