To some patients, silicone is worth it, even with the conditions. “The silicone implants look and feel so natural that it doesn’t matter that I will have to spend more money later on M.R.I.’s,” said Katherine John, a substitute schoolteacher in Savage, Minn., who had the surgery last December. But Ms. Meyer, the bank teller, decided to have saline implants after hearing about silicone’s risks and expenses. “They told me that if the silicone implant ruptured, it would kind of coagulate in the breast and you wouldn’t feel it,” she said. “The idea that you could be walking around for two years with a rupture until you had the next M.R.I. gave me an uneasy feeling.” Both women are patients of Dr. Joseph M. Gryskiewicz, a plastic surgeon in Edina, Minn., who is chairman of the emerging trends task force of the American Society for Aesthetic Plastic Surgery.