Durability – It’s All in the Polymers

By December 7, 2015Dr. Gettleman's Blog

b5658fb1-37d6-4f3a-8763-713178ffda28Dr. Lawrence Gettleman is a professor of prosthodontics and biomaterials at the University of Louisville School of Dentistry. He invented Novus and was on the team that obtained its final patent. > Click here for more about Dr. Gettleman


 

We have actually seen Novus last well beyond its five-year warranty period.  That goes for conventional dentures as well as laboratory rebases and relines. I have a photograph of a denture with a Novus liner that was at least fifteen years old. It had a little discoloration, a little peeling, a little wear, but it was basically okay. The patient who brought it in didn’t want the prosthodontist to adjust it at all. “Don’t change anything!,” he said. “It’s fine!”

That durability comes from the rubber in Novus, which is about seventy percent of the liner by weight. The rubber doesn’t need plasticizers, so it stays soft and is interpenetrated with ordinary acrylics that are used in other areas of dentistry. By blending the two materials into an interpenetrating network, the best properties of both are achieved. The polymer chains of rubber are mixed with several polymer chains of acrylics, which enables them to chemically bond to the denture base, holds the material very tightly together and keeps it intact.