Definitive Restoration Fabrication Using the Superimposition Technique in Full-Arch Implant-Supported Prostheses

<p style="margin: 0cm; font-size: medium; font-family: &quot;Times New Roman&quot;, serif; text-align: justify; background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box;"><span style="color: rgb(61, 69, 71);">The incorporation of intraoral scanners (IOS) into clinical workflows has enabled the realization of a completely digital approach in prosthodontic treatment. Among the key advantages of this digital workflow are enhanced patient comfort, simplification of clinical and disinfection procedures, elimination of the need for conventional stone cast fabrication, and improved communication and collaboration between the clinician and the dental laboratory technician. However, the optimal protocol to achieve maximum accuracy in full-arch intraoral scanning has yet to be clearly established. The accuracy of IOS is influenced by multiple intraoral and material-related factors, including the presence of saliva, mobility of soft tissues, lack of keratinized mucosa, and high reflectivity of restorative surfaces. Moreover, variables such as the stitching algorithm used for image data alignment, the absence of stable anatomic landmarks in edentulous spans, and the geometric design of scan bodies (SBs) significantly impact the precision of digital impressions in long-span, implant-supported fixed restorations. These challenges render the digital acquisition of full-arch edentulous arches one of the most demanding scenarios in digital prosthodontics.&nbsp;<o:p></o:p></span> <p style="margin: 0cm; font-size: medium; font-family: &quot;Times New Roman&quot;, serif; text-align: justify; background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box;"><span style="color: rgb(61, 69, 71);">This technical report introduces a time-efficient and reproducible technique that enhances scan accuracy and minimizes data stitching errors by utilizing readily available methylene blue dye. In this method, one reference mark is applied to the buccal frenulum and two to each maxillary tuberosity region using methylene blue. These three-dimensionally distributed reference points facilitate improved alignment during the stitching process and contribute to enhanced accuracy in full-arch intraoral scanning.<o:p></o:p></span>