Assessment of Proplast-Teflon disc replacements [published erratum appears in J Oral Maxillofac Surg 1991 Feb;49(2):220] This retrospective study reports the findings in the follow-up of 31 temporomandibular joints in which Proplast-Teflon (Vitek Inc, Houston, TX) replacements were used. Among the problems noted were pain, malocclusion, restricted opening, and degenerative changes in the condyle and fossa. 