A Modified Technique for Fabrication of Inverted U-shaped Acrylic Stoppers for Neutral Zone Recording in Complete Dentures

REPORTin severely resorbed ridges, 6 while Chandra et al. reported technique sensitivity associated with functional molding procedures. 7herefore, the aim of this technical report is to describe a modified technique that uses inverted U-shaped acrylic stoppers incorporated into the record base to enhance stabilization of the neutral-zone recording material and to maintain the established vertical dimension during functional movements. CliniCal PresentationThe present technique was performed on a single completely edentulous patient reporting difficulty in retention and stability of existing dentures. introduCtionSuccessful complete denture therapy depends on achieving optimal stability, retention, and patient comfort, particularly in patients with severely resorbed residual ridges.One of the most critical determinants of denture stability is the neutral zone, defined as the potential space between the lips and cheeks on one side and the tongue on the other side. 1 Positioning denture teeth and contouring polished surfaces within this zone minimizes destabilizing muscular forces and enhances the functional efficiency of the prosthesis. 2,3he neutral zone concept was first emphasized by Fish, who highlighted the role of muscular balance in denture stability. 4ater, Beresin and Schiesser formalized neutral zone impression techniques using functional molding procedures to accurately record this zone. 5Despite their clinical importance, conventional neutral zone recording techniques often present challenges such as inadequate stabilization of recording materials, difficulty in maintaining vertical dimension, and increased technique sensitivity.Various modifications have been proposed, including the use of wire loops, tissue stops, and acrylic frameworks, to support the recording material during functional movements.However, these methods may be prone to distortion, displacement, or difficulty in fabrication, potentially compromising the accuracy of the neutral zone record.Recent studies have highlighted limitations of conventional techniques, including instability of recording materials and difficulty in maintaining the vertical dimension during functional movements.Shetty et al. demonstrated challenges in stabilizing neutral zone materials