Abstract
Statement of problem
Information on the dimensional changes in maxillary and mandibular dentures made by
using computer-aided design and computer-aided manufacturing (CAD-CAM) techniques
under uniform testing conditions is lacking.
Purpose
The purpose of this in vitro study was to evaluate the dimensional changes and reproducibility
of maxillary and mandibular dentures by using CAD-CAM-milled and 3D-printed techniques.
Material and methods
Maxillary and mandibular edentulous models with wax occlusal rims were scanned, and
dentures were designed by using a CAD software program and fabricated by using 2 techniques
and materials: CAD-CAM-milled (CCM) and 3D-printed (3DP). The 3DP fabrications included
4 subgroups: dentures printed with a 90-degree build angle with UV light polymerization
on the reference model (3DP 90M), dentures printed with a 90-degree build angle and
light polymerization without the reference model (3DP 90), dentures printed with a
45-degree build angle with light polymerization on the reference model (3DP 45M),
and dentures printed with a 45-degree build angle and light polymerization without
the reference model (3DP 45). The preprocessing and postprocessing scan files of each
denture produced by CCM and 3DP were superimposed by using a surface matching software
program. Ten points each on maxillary and mandibular dentures were measured for deviations
after processing. Additionally, for each denture, the widths were measured between
the canines and molars, the anteroposterior plane from cusp tips between the canines
and molars, and the vertical plane from the cusp tip of the canines to the marginal
gingiva. They were then compared with those in the denture design CAD cast. The Kruskal-Wallis
analysis of variance test was used for statistical analyses (α=.05).
Results
According to digital superimposition, CCM had the smallest values of deviation with
no statistical difference (P>.05), indicating more uniform results from measurement points in both maxillary and
mandibular dentures, followed by 3DP 90M, 3DP 90, 3DP 45M, and 3DP 45. Regarding the
width measurements, CCM had the smallest values of deviation (P<.05). In 3DP, smaller deviation values were observed at the vertical plane from the
tip of the canine to the marginal gingiva, and larger values were observed in the
intermolar width (P<.05).
Conclusions
CCM exhibited smaller dimensional changes and better reproducibility among the tested
techniques. In 3DP, the build angle and methods of light postprocessing influenced
the dimensional stability. The 90-degree build angle with additional light polymerization
on the cast improved the dimensional deviations.
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Article info
Publication history
Published online: August 04, 2021
Publication stage
In Press Corrected ProofFootnotes
Supported by a grant from the National Taiwan University Hospital, Taipei, Taiwan, (NTUH.109-S4615) and Southern Taiwan Science Park Bureau, Ministry of Science and Technology, Taiwan, (STSP EX-03-17-29-108).
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
