Photogrammetry Impression Technique: A Case History Report

Abstract

Purpose: The aim of this report is to present photogrammetry as a reliable step in the fabrication of a full-arch immediate rehabilitation. Materials and Methods: A 59-yearold man attended the department seeking dental rehabilitation for the sequelae of severe oral health neglect. The mandibular teeth suffered from advanced periodontal disease and the patient wore a maxillary complete denture. An irreversible hydrocolloid impression of the mandibular arch was made, poured in stone, and digitally scanned to create the first stereolithography (STL) file. All teeth with the exception of two retained as landmarks were extracted, and seven implants were placed under local anesthesia and their positions recorded using photogrammetry. Maxillary and mandibular dental arch alginate impressions were made, poured in laboratory stone, and scanned. A provisional restoration was placed 7 hours after surgery using the STL files to determine the best-fit line. Results: Radiographic and clinical follow-up after 1 year showed a favorable evolution of the implants. No screw loosening or other mechanical or biologic complications were observed. Conclusion: The case history using the described system suggests certain advantages over conventional techniques. More research is needed to assess the possible benefits associated with photogrammetry when making implant-supported restorations. Int J Prosthodont 2016;29:71-73.

Digital scanning for complete-arch implant-supported restorations: A systematic review

“…[24][25][26][27][28][29] One study was excluded because it described physical impressions only 30 and another because it was a clinical report. 31 A total of 20 studies published after 2008 were analyzed.…”

“…Two main technologies are available for digital scanning: confocal microscopy associated 6 with 3D imaging technologies (Table 2) 19,20,[32][33][34][35][36][37][38][39][40] and photogrammetry. 31,[41][42][43] Photogrammetry relies on photographic images to record the geometrical properties of 3D objects (optical targets) and their interrelated spatial positions. 44 Only 5 clinical studies were retrieved: 1 pilot study, 16 1 prospective study, 45 and 3 randomized controlled trials (RCTs), 40,41,46 with a follow-up of 1 to 2 years.…”

Accuracy of photogrammetry, intraoral scanning, and conventional impression techniques for complete-arch implant rehabilitation: an in vitro comparative study

“…With the development of digital technology, commercially available photogrammetry systems provide a new method for implant impression making for edentulous patients. Some case reports have reported that the photogrammetry system can be successfully used with complete-arch implant impressions with high framework fit [ 32 – 34 ]. However, current studies on the accuracy assessment of photogrammetry systems are very scarce, and the results are inconsistent [ 17 , 35 , 36 ].…”

Digital Dental Models: Is Photogrammetry an Alternative to Dental Extraoral and Intraoral Scanners?

“…For many years, the use of photogrammetry was difficult because of the strict need to use special equipment to take images and processing them [ 6 , 27 ]. As some studies reported [ 28 , 29 ], in recent years, due to the advancement of technology in the field of digital photography and the creation of specific software, photogrammetry has become an accurate, reliable, and economically accessible method for most dentists, and it is now becoming an interesting resource in the field. The accuracy of photogrammetry was evaluated in terms of precision (deviation between datasets from the same acquisition method) and trueness (deviation between datasets from different acquisition methods) [ 15 , 26 ].…”