Abstract
Statement of problem
Alternatives to the bilateral interocclusal registration scanning technique to improve
virtual articulation have not been fully investigated.
Purpose
The purpose of this in vitro study was to compare the accuracy of virtually articulating
digital casts by using bilateral interocclusal registration scans versus a complete
arch interocclusal scan.
Material and methods
A set of maxillary and mandibular reference casts were hand-articulated and mounted
on an articulator. The mounted reference casts were scanned, and the maxillomandibular
relationship record was scanned 15 times using 2 different scanning techniques, the
bilateral interocclusal registration scan (BIRS) and complete arch interocclusal registration
scan (CIRS), with an intraoral scanner. The generated files were transferred to a
virtual articulator, and each set of scanned casts was articulated using BIRS and
CIRS. The virtually articulated casts were saved as a set and transferred to a 3-dimensional
(3D) analysis program. The scanned casts were set in the same coordinate system as
the reference cast and overlaid on top of the reference cast for analysis. Two anterior
and 2 posterior points were selected to determine points of comparison between the
reference cast and test casts virtually articulated with BIRS and CIRS. The mean discrepancy
between the 2 test groups and the anterior and posterior mean discrepancy within each
group were tested for significance by using the Mann-Whitney U test (α=.05).
Results
A significant difference was found between the virtual articulation accuracy of BIRS
and CIRS (P<.001). The mean deviation for BIRS was 0.053 ±0.051 mm and that for CIRS was 0.265
±0.241 mm. Furthermore, significant differences were found between the anterior and
posterior deviations in both BIRS (P=.020) and CIRS (P<.001). The mean deviation for BIRS was 0.034 ±0.026 mm in the anterior and 0.073
±0.062 mm in the posterior. The mean deviation for CIRS was 0.146 ±0.108 mm anteriorly
and 0.385 ±0.277 mm posteriorly.
Conclusions
BIRS was more accurate than CIRS for virtual articulation. Moreover, the alignment
accuracy of anterior and posterior sites for both BIRS and CIRS exhibited significant
differences, with the anterior alignment exhibiting better accuracy in relation to
the reference cast.
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Article info
Publication history
Published online: February 20, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Identification
Copyright
© 2023 by the Editorial Council for the Journal of Prosthetic Dentistry.
