On the issue of the accuracy regarding intraoral photogrammetry technology: an analysis of relevant evidence base data

Abstract

Introduction. Considering recent introduction of intraoral photogrammetry technology into dental practice, it is advisable to conduct a general analysis of the results obtained from the first laboratory and clinical studies, processing of which will allow to objectify the accuracy indicators for this method, the advantages of its application and aspects that require further detailing, all of which will impact the request for future applied and experimental research works of an approbatory nature.Objective of the research. To conduct a comparative analysis on the accuracy indicators of intraoral photogrammetry technology used for the registration of dental implants coordinate position based on the results of previous laboratory and clinical studies.Materials and methods. Collection of publications for conducting a targeted literature review was carried out by initial search of such through the Google Scholar service (https://scholar.google.com/). The following keywords were used for the search request: «intraoral photogrammetry», «dental implant», «intraoral scanner», «trueness», «precision». Scientific works published in English were taken into account, as well as those presented in periodical scientific journals indexed within the scientometric databases of Scopus and/or Web of Science.Results and discussions. The technology of intraoral photogrammetry in terms of implementation methodology is not completely analogous to the technology of classical photogrammetry, since it represents somewhat of «photogrammetric algorithm» for matching the positions of coordinate points present over specific scan abutments using artificial intelligence’s reconstructive and comparative approaches for such matter, and not the actual simultaneous registration of the position of all scan markers by an extraoral device from a distance and/or projections at which their photofixation occurs according to the «single frame» principle. Available laboratory and clinical studies demonstrated that the accuracy of the intraoral photogrammetry method is comparative to extraoral photogrammetry methods, and that the accuracy of the intraoral photogrammetry technology is higher in comparison with various technologies of intraoral scanning in means of registering objectified positions of dental implants within edentulous jaws.Conclusions. Considering available literature data it may be resumed that the accuracy of the intraoral photogrammetry technology for the objective registration of the dental implants’ coordinate position within the structure of the edentulous upper or lower jaw (model) is higher than the accuracy of various intraoral scanning technologies, which are not combined with photogrammetry technology, but may be used for the same purpose. The indicators of trueness and precision of the intraoral photogrammetry technology are comparable to similar parameters of some extraoral photogrammetry systems. The validity of the AI-based photogrammetric matching algorithm when using such with field of view equaled to the window’s size of scanner tip, which is significantly smaller than the size of the actual prosthetic field, requires further clarification in future standardized clinical studies.