Intraoral, Extraoral, and Navigation Photogrammetry Trueness for Complete-Arch Digital Implant Impression: A...

Area of Science:

• Dental technology
• Digital dentistry
• Implantology

Background:

• Photogrammetry offers potential for digital impressions in implant dentistry.
• Comparing the accuracy and efficiency of different photogrammetry systems is crucial for clinical adoption.

Purpose of the Study:

• To compare the in vitro trueness of three photogrammetry-based systems for complete-arch digital implant impressions.
• Systems evaluated: intraoral photogrammetry (IPG), extraoral photogrammetry (EPG), and navigation photogrammetry (NPG).

Main Methods:

• A maxillary edentulous cast with abutment analogs was used as a reference.
• 10 scans were performed for each system (IPG, EPG, NPG).
• Trueness was assessed by superimposing test and reference Standard Tessellation Language (STL) files, calculating linear and angular deviations.

Main Results:

• All systems demonstrated high accuracy with minimal deviations (ΔRMS: EPG 18.10 µm, IPG 20 µm, NPG 20.70 µm).
• Scanning time was significantly shorter for EPG (8 s) and NPG (8.5 s) compared to IPG (46.5 s).
• Photogrammetry system and implant position significantly affected linear deviations, particularly in horizontal axes (ΔX, ΔY).

Conclusions:

• Intraoral, extraoral, and navigation photogrammetry are accurate for complete-arch digital impressions.
• EPG and NPG systems offer faster scanning times than IPG.
• System and implant position influence deviation patterns, requiring consideration for clinical application.