resurfacing

Coating a bone graft with an inorganic compound found in bones and teeth may significantly increase the likelihood of a successful implant, according to Penn State researchers. Natural bone grafts need to be sterilized and processed with chemicals and radiation before implantation into the body...

I've had my Skip Dr for a while, and have fixed quite a few CDs, but I have no idea how many. I can't tell if I need to replace my wheel or not. Because I've had it for so long, I don't remember how it worked when it was new, verses how it works now. If anyone could give me some advice...