After more than a decade of sharply restricted sales because of health concerns, silicone gel breast implants are poised for an unusual return to the market. The Food and Drug Administration is reviewing an application to approve the controversial devices, and close observers believe it will rule on the subject this year.The National Organization for Women and the consumer group Public Citizen fear that the FDA is moving too fast, and will call today for the agency to slow considerably its review process. They say that the long-term studies needed to determine whether there is a health risk from silicone...