Some doctors use slowly dissolving stitches, while other doctors use permanent stitches to sculpt the tip. My educated guess is that it's about 60/40 dissolving/permanent. So if you really want to know, you have to specifically ask your surgeon.The trend in rhinoplasty right now is to leave as much cartilage intact as possible, and reshape it with stitches. If permanent stitches are chosen, the assumption is they hold the new cartilage shape and don't cause additional future problems like stitch infection. If dissolving stitches are utilized, they reshape the cartilage long enough to ensure the new shape, and then fade off into the distance so they don't cause long term foreign body reactions. I think it just comes down to surgeon preference, I have never seen any data comparing the two materials on a basis of result or complication.