Abstract
Statement of problem
The digitalization of completely edentulous arches presents limitations because of
the lack of anatomic structures for best-fit alignment during the image generation
process of the scanner’s software program.
Purpose
The purpose of this clinical study was to evaluate a new device for intraoral scanning
and to analyze its usefulness in capturing the 3-dimensional (3D) position of implants
in edentulous mandibular arches.
Material and methods
The 3D positions of 40 implants in 10 participants with fixed interim mandibular prostheses
were evaluated by comparing 3 scanning techniques. Images were generated in 2 experimental
groups, with digital scan bodies (group SC) and with the scanning device (group SD)
and in a control group (group CT) in which images were obtained by laboratory scanning
of casts produced from splinted impression copings. The standard tessellation language
(STL) files were superimposed by using a reverse engineering software program to measure
the 3D coordinate system. Variations in implant linear displacements (Δx, Δy, and
Δz), total 3D displacement (), and angle projections (ΔθXY, ΔθXZ, and ΔθYZ) were statistically analyzed (α=.05).
The distances between the implants were also measured. The Spearman correlation coefficient
(α=.05) was used to find the correlation between the 3D coordinates and the distances
between the implants.
Results
Group SD had lower values for linear displacement than group SC; however, this difference
was not statistically significant except for implant #2. The overall evaluation showed
a significant difference with better accuracy for group SD. Concerning angular displacements,
group SD showed lesser angular variation for the 3 projection planes. For the distances
between the implants, significant differences were only observed for the “all” assessment in
which group SD behaved similarly to group CT, while group SC showed the highest values
(P<.05). No correlation was detected between the axes (x, y, and z) and the distances
between the implants.
Conclusions
The evaluated scanning device led to improved trueness for linear, angular displacements,
and distances between implants in mandibular edentulous arches.
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Article info
Publication history
Published online: April 14, 2021
Identification
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© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
