European Journal of Prosthodontics and Restorative Dentistry

Mini Dental Implants in the Management of The Atrophic Maxilla and Mandible: A New Implant Design and Preliminary Results


The aim of this study was to compare the clinical accuracy of digital and conventional
dental implant impressions. Two types of implant impressions were made for each case,
namely a conventional open-tray impression and a digital implant impression (DII) using
a Trios IOS. Master casts were scanned using a D800 laboratory scanner and STL files
were retrieved from conventional and digital workflows to be exported for comparison.
The distance between center points, angulation, rotation, vertical shift, and surface mismatch
of the scan bodies were evaluated and compared between conventional and digital
impression techniques. Comparing digital and conventional impression techniques
the following factors showed statistically significant differences: distance (73.7±75 μm),
angulation (0.42±0.3º), and surface mismatch of scan bodies. The difference in conventional
and digital impression techniques as regards to angulation and distance between
the implants were associated with distance, angle, and vertical shift differences in scan.
The mismatch of the scanned surface of scan bodies was twice higher for the intraoral
scanner group. Clinicians should therefore control the implant suprastructures clinically
and also using casts (e.g. printed casts) when a digital scan is planned.
Dental Implants
Digital Impression
Intraoral Scanner
Conventional Impressions


Prof. Craig William Barclay, Dr. Sarra Jawad, Dr. Emma Foster

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