Wear still occurs even if less than the competition. Since Si3N4 is soluble and resorbable, patients dont have to worry about negative side effects. In fact the wear particles seem to enhance the healing process. Although there is a potential issue, in theory, with patients that have impaired liver function as they may not be able to handle the increased bioavailable ammonia for which the liver turns into urea. Although patients with impaired liver and/or kidney function will also have issues removing excess metals as well. Not sure how ZTA wear is processed.
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