Abstract
Statement of problem
Photogrammetry technology has been used for the digitalization of multiple dental
implants, but its trueness and precision remain uncertain.
Purpose
The purpose of this in vitro investigation was to compare the accuracy (trueness and
precision) of multisite implant recordings between the conventional method and a photogrammetry
dental system.
Material and methods
A definitive cast of an edentulous maxilla with 6 implant abutment replicas was tested.
Two different recording methods were compared, the conventional technique and a photogrammetry
digital scan (n=10). For the conventional group, the impression copings were splinted
to an additively manufactured cobalt-chromium metal with autopolymerizing acrylic
resin, followed by recording the maxillary edentulous arch with an elastomeric impression
using an additively manufactured open custom tray. For the photogrammetry group, a
scan body was placed on each implant abutment replica, followed by the photogrammetry
digital scan. A coordinate-measuring machine was selected to assess the linear, angular,
and 3-dimensional discrepancies between the implant abutment replica positions of
the reference cast and the specimens by using a computer-aided design program. The
Shapiro-Wilk test showed that the data were not normally distributed. The Mann-Whitney
U test was used to analyze the data (α=.05).
Results
The conventional group obtained an overall accuracy (trueness ±precision) value of
18.40 ±6.81 μm, whereas the photogrammetry group showed an overall scanning accuracy
value of 20.15 ±25.41 μm. Significant differences on the discrepancies on the x axis
(U=1380.00, P=.027), z axis (U=601.00, P<.001), XZ angle (U=869.00, P<.001), and YZ angle (U=788.00, P<.001) were observed when the measurements of the 2 groups were compared. Furthermore,
significant 3-dimensional discrepancy for implant 1 (U=0.00, P<.001), implant 2 (U=0.00, P<.001), implant 3 (U=6.00, P<.001), and implant 6 (U=9.00, P<.001) were computed between the groups.
Conclusions
The conventional method obtained statistically significant higher overall accuracy
values compared with the photogrammetry system tested, with a trueness difference
of 1.8 μm and a precision difference of 18.6 μm between the systems. The conventional
method transferred the implant abutment positions with a uniform 3-dimensional discrepancy,
but the photogrammetry system obtained an uneven overall discrepancy among the implant
abutment positions.
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Article info
Publication history
Published online: June 18, 2021
Footnotes
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
