3D finite element analysis of removable partial denture with lingual bar major connector constructed with cobalt chromium, PEEK, PEKK, and BioHPP

Using the same size of PEEK, Bio HPP as the optimal dimensions of the cobalt chromium major connector of the mandibular class I RPD causes increased stress and deflection to the supporting structure, teeth, and soft tissues. This can be assigned to the PEEK's, Bio HPP, lower stiffness compared to cobalt chromium. On the other hand, PEKK showed decreased stresses and deflection of the supporting structure. When using PEEK and Bio HPP for class I RPD, the mandibular major connector must be larger.