Comparison of Stress in Conventional Cast and Resin-Luted Implant Frameworks. A Finite Element Analysis Study

Abstract

Many articles have been published on complete-arch implant prosthesis [1,2]. Frameworks have been conventionally performed by a casting protocol in the laboratory through cast-on abutments [3]. Cast prosthesis could be cement or screw retained. Nowadays these prostheses can be made using CAD-CAM4; [4] however, an alternative way of performing these prostheses is by RCR with access channel [5,6]. This provides passive adjustment and retrievability. Passive prosthesis fit is one of the most important factors for correct implant and prostheses performance [7]. Misfit is the main problem, the product of several factors that occur during the manufacture of the cast prosthesis, such as distortion of the dental impression, distortion of the master cast, distortion during the casting [8]. For example, these can result in bone loss, loosening of the screw, and fractures [9]. In comparison, the RCR appears to have a better passive fit because the superstructure is cemented to titanium abutments, which have perfect fit, and the cement absorbs and distributes the occlusal force more efficiently [10-13]. Further maintain the retrievability due to access channel. Some studies have performed in vitro tests of RCR, single-unit implant crown [14,15], three unit [10], and complete-arch framework [6]. These demonstrated that RCR produce a better biomechanical performance as they present a better passive fit and stress distribution; thus, the objective of the present study is to deepen the knowledge of the RCR with access channel through a finite element study. Crimson Publishers Wings to the Research Research Article