PEEK plates for the fixation of mandibular condylar base fractures: a finite element analysis comparison of single and double plate configurations with titanium and resorbable systems.

Achieving stable fixation in the treatment of mandibular condylar base fractures is critical for preventing complications and restoring function. The aim of this study was to biomechanically evaluate and compare titanium, 60% carbon fiber-reinforced polyetheretherketone (Cfr-PEEK), and resorbable polymer plates used in the fixation of condylar base fractures under single- and double-miniplate configurations using finite element analysis. A three-dimensional mandibular model representing a condylar base fracture was constructed, and finite element models incorporating different plate materials and fixation configurations were developed. Vertical occlusal loads of 135 N and 500 N were applied to the contralateral molar region. Von Mises stresses in the bone, plates, and screws, as well as stress distribution, displacement, and interfragmentary gap at the fracture site, were analyzed. The results demonstrated that both plate material and fixation configuration influenced stress distribution within the plate-screw system and displacement behavior at the fracture line. Distinct patterns were observed between single- and double-miniplate applications depending on the loading magnitude, particularly in terms of fracture stability and interfragmentary movement. These findings indicate that plate material plays a determining role in the biomechanical behavior of fixation systems and should be evaluated together with functional loading conditions in the management of condylar base fractures.