Impression of multiple implants using photogrammetry: Description of technique and case presentation

Abstract

Aim: To describe a technique for registering the positions of multiple dental implants using a system based on photogrammetry. A case is presented in which a prosthetic treatment was performed using this technique. Study Design: Three Euroteknika® dental implants were placed to rehabilitate a 55-year-old male patient with right posterior maxillary edentulism. Three months later, the positions of the implants were registered using a photogrammetry-based stereo-camera (PICcamera®). After processing patient and implant data, special abutments (PICabutment®) were screwed onto each implant. The PICcamera® was then used to capture images of the implant positions, automatically taking 150 images in less than 60 seconds. From this information a file was obtained describing the relative positions – angles and distances – of each implant in vector form. Information regarding the soft tissues was obtained from an alginate impression that was cast in plaster and scanned. A Cr-Co structure was obtained using CAD/CAM, and its passive fit was verified in the patient’s mouth using the Sheffield test and the screw resistance test. Results and Conclusions: Twelve months after loading, peri-implant tissues were healthy and no marginal bone loss was observed. The clinical application of this new system using photogrammetry to record the position of multiple dental implants facilitated the rehabilitation of a patient with posterior maxillary edentulism by means of a prosthesis with optimal fit. The prosthetic process was accurate, fast, simple to apply and comfortable for the patient. Key words:Dental implants, photogrammetry, dental impression technique, CAD/CAM.

An In Vitro Study of Factors Influencing the Performance of Digital Intraoral Impressions Operating on Active Wavefront Sampling Technology with Multiple Implants in the Edentulous Maxilla

“…Chairside digital impressions were introduced in the last decade to expedite the data capturing process and to eliminate most of the drawbacks usually encountered with conventional impressions, thereby decreasing patient discomfort while improving the predictability of prosthesis design and manufacturing procedures . Chairside extraoral scanners use the principles of photogrammetry to gather information regarding the relative 3D implant positions with limited information regarding the surrounding soft tissue . On the other hand, chairside intraoral systems use various technologies to capture scanned objects and therefore are more versatile and capable of acquiring 3D surfaces of teeth, soft tissue, and scanbodies.…”

Accuracy, scanning time, and patient satisfaction of stereophotogrammetry systems for acquiring 3D dental implant positions: A systematic review

“…[5][6][7][8][32][33][34][35][36][37][38][39][40][41][42] The selected studies were classified based on the type of investigation: 37 3 in vivo studies, 32,36,42 6 in vitro experiments, [7][8][33][34][35] and 6 case reports. 5,[38][39][40][41] Although there are 4 PG systems currently available in the market, only 2 of these PG systems were identified among the reviewed studies namely the PIC System from PIC Dental and ICam 4D from Imetric (Table 5). Two in vivo 32,36 and 4 in vitro studies 7,34,35,37 evaluated the PIC system, while 2 in vitro 8,33 and 1 in vivo study 52 used the ICam 4D system.…”

Accuracy of digital impressions for implant‐supported complete‐arch prosthesis, using an auxiliary geometry part—An in vitro study

“…The external markers are positioned in each abutment and using the extraoral camera is determined their spatial position without making physical contact. The position of the implants and the distances and angles between them are stored as an STL file; however, this STL file does not contain information about the soft tissues or possible teeth (Peñarrocha‐Oltra, Agustín‐Panadero, Bagán, Giménez, & Peñarrocha, ; Pradíes, Ferreiroa, Özcan, Giménez, & Martínez‐Rus, ). Meanwhile, the same arch is captured using an intraoral scanner to produce an STL file of the surface to be restored, but in this case both the soft tissues and possible teeth in the mouth are digitized.…”