Page 68 - Demo

Chapter 366in more than 26,000 patients who were treated with either the Vitek-Kent system or the Vitek Proplast-Teflon disc replacement before the production was halted.(6,7,12,24,33,34) The fossa component consisted of three (and later two) layers of porous Proplast and high density PTFE (Teflon). While the Proplast layer in contact with the fossa temporal bone could allow ingrowth of both soft and hard tissues, the Teflon layer articulating against the condyle was meant to withstand wear from the joint articulation. (6,12,23,34).A final TMJ system to be highlighted is the Nexus CMF TMJ Total Joint Prosthesis (more commonly known as the Christensen TMJ System) (Fig. 3). This system different from the other recent (more traditional) metal-on-polymer bearing type of implants systems, in being a metal-on-metal joint replacement device. This meant both the fossa and condylar head were made of a cast cobalt-chromium-molybdenum (CoCrMo) alloy. Furthermore, the complete mandibular component and the fixation screws were also made of CoCrMo.(6,7,11,35–37) Due to reason explained further in this paper, the Christensen device recently had its FDA approval revoked and the system is no longer manufactured.Fig. 3: Nexus CMF Total Joint ProsthesisFig. 2: Vitek-Kent Total Joint ProsthesisNikolas de Meurechy NW.indd 66 05-06-2024 10:14