Abstract
Statement of problem
The effect of various scan bodies and scanning techniques on the accuracy and scan
time for completely edentulous patients is not well understood.
Purpose
The purpose of this in vitro study was to evaluate the effects of 4 scanning techniques
and 5 intraoral scan bodies (ISBs) on the trueness, precision, and scan time in a
completely edentulous arch with 4 implants.
Material and methods
Five different ISB systems: AF, NT, DE, C3D, and ZI, and 4 different scanning techniques:
unmodified master model (NO), glass fiduciary markers placed on the edentulous ridge
(GB), pressure-indicating paste brushed over the ridge and palate (PP), and floss
tied between the scan bodies (FL), were evaluated. Scan bodies were attached to an
edentulous maxillary model with 4 dental implant analogs and scanned by using a structured
blue light industrial scanner, and 5 consecutive digital scans of the model were made
by using an intraoral scanner and 1 of the 4 techniques (n=5). The scans were superimposed
on the master reference model, and the distance deviation and angular deviation of
the scan bodies was calculated. The scan time was also recorded. A 2-factor ANOVA
was used to examine the effect of scan body and technique on the trueness and scan
time, with subsequent Tukey honestly significant difference or Bonferroni-corrected
Student t tests. Precision was evaluated by tests for homogeneity of the variances between
groups. Reliability for the entire study was evaluated using the intraclass correlation
coefficient (α=.05 for all tests).
Results
The overall reliability of the study according to intraclass correlations was 0.999.
In terms of trueness, no statistically significant interaction was found between the
effects of scan body and technique on the distance deviation (P=.246); however, the scan body (P=.031) and technique (P<.001) each had a significant effect independently. A statistically significant interaction
was found between the effects of the scan body and technique on angular deviation
(P<.001). Testing for the homogeneity of variances demonstrated significant differences
in the precision among the groups in terms of distance deviation (P≤.013) and angular deviation (P≤.003). No statistically significant interaction was found between the effects of
the scan body and technique (P=.076) on the scan time; however, the scan body alone was found to have a significant
effect (P<.001).
Conclusions
The accuracy (trueness and precision) of complete-arch digital implant scans using
ISBs was affected by both the scan body and scan technique when using an intraoral
scanning system. The ZI scan body had significantly less distance deviation, whereas
splinting scan bodies with floss led to significantly more distance deviation. The
scan techniques with different surface modifications were not found to improve the
scan accuracy. The use of different ISBs led to significant differences in the scan
time.
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Article info
Publication history
Published online: April 27, 2019
Footnotes
Supported in part by a Stanley D. Tylman Research Grant from the American Academy of Fixed Prosthodontics, (OSU Grant #60062097).
Identification
Copyright
© 2019 by the Editorial Council for The Journal of Prosthetic Dentistry.
