In recent years, a major research goal of companies has been to create mechanical components suitable for rehabilitation that are safer and more reliable. Evaluating their biomechanical features could be a way to improve them. Implant-retained overdentures are a commonly used prosthetic treatment option For completely edentulous patients. various types of attachments are used, including bars or studs and depending on the arch and interocclusal space. A recently introduced attachment system with ready –made retentive caps to utilize the properties of this material. This systems have polyetheretherketone (PEEK) rather than nylon inserts, which improve physical properties of this caps. Custom fabrication of a retentive caps in a digital way has been reported, Which provide useful information for the performance improvement of retentive systems.
