People call the teflon-shielded bearings "teflon bearings" because it is easier to say. Just like many people will order a coke when the actual name is coca cola
If a couple of bearings are bad and you reinstall them, the effect could be pretty bad. Typically when a bearing feels rough it is the result of some of the balls wearing out, or something wrong with one of the races. In any case, it is likely that the bearing will get worse and eventually destroy itself. unfortunately, if the baring is in a hub carrier or diff then other parts will be damaged as well, costing even more money The smarter choice is to replace them.