The use of endodontic microscopy is important for adhesive fiber post removal, but this procedure remains risky due to the difficulty in post removal by trimming or ultra-sound insertion without affecting the root structure integrity. Also, the techniques available for fiber post removal require significant operator skill to avoid possible deleterious consequences as these techniques are very precise. This dental technique describes a solution developed from the experience obtained attempting to gain access to calcified conduits using prototyped guides that facilitate localization and direct adhesive post removal through the root canal system. The removal of an adhesive fiber post is an important step for endodontic retreatment and resolution of prosthetic problems. This protocol is performed with a prototyped endodontic guide. Computer-aided design and computer-aided manufacturing (CAD - CAM) technology is used to generate guides with prototyping and is a useful tool for fiber post removal. The combination of intra-oral scanning associated with prototyped endodontic guide is a promising option that is easy to execute and offers a less stressful solution regarding the possibilities of deleterious consequences of the procedure, such as radicular structure reduction, crack propagation, root axis deviation and perforation. This approach is considered important for difficult cases, in which the ordinary known procedures for post removal are not suitable.