Abstract
Statement of problem
Information on the morphological accuracy of crowns automatically produced by different
computer-aided design (CAD) software programs for multilevel dentition defects is
limited.
Purpose
The purpose of this in vitro study was to compare the morphological accuracy of crowns
fabricated using different CAD software programs with different design theories for
multilevel dentition defects.
Material and methods
Four dentition defect types (the standard group, the abrasion group, the adjacent-teeth-missing
group, and the antagonist-tooth–missing group, n=10) were fabricated to represent
different levels of missing dentition information. Two design modes (the library mode
and correlation mode) of 3 common CAD software programs (3Shape [3Shape Dental system],
CEREC [Dentsply Sirona], and exocad DentalCAD [exocad GmbH]) were used to design crowns
automatically, and the morphologies of the generated crowns and original teeth were
recorded. The root mean square (RMS) value was calculated to evaluate the morphological
deviations between the autogenerated crowns and original teeth using the 3D matching
system (Geomagic GmbH). As each group in this study represented 3 factors, the mean
differences between the treatment combinations and the interaction effects were analyzed
by performing factorial analysis of variance (α=.05).
Results
The RMS values of autogenerated crowns designed using the correlation method were
significantly lower than those designed using the library method of each software
program in the 4 groups (P<.05). The RMS values of crowns designed by the 3Shape and CEREC software programs
in library mode under conditions with dentition information loss were lower than those
of crowns designed by the exocad software program (P<.05). Changes in the acquisition of dental information did not decrease the CEREC
design accuracy (P>.05), while they did decrease the 3Shape and exocad design accuracy (P<.05).
Conclusions
The correlation method showed higher accuracy in rebuilding the original morphology
of the teeth than the library method. Both the 3Shape and CEREC software programs
showed higher accuracy than the exocad software program in library mode under conditions
with dentition information loss, while CEREC showed higher stability than the 3Shape
and exocad software programs.
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Article info
Publication history
Published online: February 18, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: Supported by the National Natural Science Foundation of China (81970987).
F.W. and T.Z. contributed equally to this article.
Identification
Copyright
© 2023 by the Editorial Council for the Journal of Prosthetic Dentistry.
