Abstract
Statement of problem
Studies on the movement of artificial teeth during the manufacturing of computer-aided
design and computer-aided manufacturing (CAD-CAM) complete dentures using the custom
disk method with milled recesses and on whether the movement is within a clinically
acceptable range are lacking.
Purpose
The purpose of this in vitro study was to assess the trueness and precision of the
artificial teeth on custom disks the recesses of which were manufactured using a milling
machine and to compare the results with the recesses manufactured using a 3-dimensional
(3D) printer.
Material and methods
Four types of artificial teeth (maxillary left central incisors [Max-L1], mandibular
left central incisors [Man-L1], maxillary left first premolars [Max-L4], and maxillary
left first molars [Max-L6]) were prepared. Milling data were created, and 3 of each
type of tooth were attached to each disk made up of 3 concentric circles (large, medium,
and small). Five each of the 3D-printed custom disks and custom disks with milled
recesses were milled based on the milling data. Standard tessellation language data
were obtained through cone beam computed tomography and superimposed by using a CAD
software program. Mean absolute error (MAE) values were calculated to assess trueness
and precision; MAE values of artificial teeth in custom disks with milled recesses
and 3D-printed custom disks were statistically compared by using the 2-way analysis
of variance test with 2 factors, 2 types of custom disks and 4 types of artificial
teeth, and the Tukey post hoc comparison (α=.05).
Results
Regarding position trueness, the MAE value of Man-L1 on the milling custom disk was
significantly lower than that of the 3D-printed custom disk (P<.001), whereas the MAE values of Max-L4 and Max-L6 on the milling custom disk were
significantly higher than those on the 3D-printed custom disk (P<.001). No significant difference was found in the MAE value of the position trueness
of Max-L1 between the milling and 3D-printed custom disks. Regarding position precision,
the MAE values of Max-L1, Man-L1, and Max-L4 on the milling custom disk were significantly
lower than those on the 3D-printed custom disks (P=.002, P<.001, P=.025, respectively). However, no significant difference was seen in the MAE value
of position precision of Max-L6 between the milling and 3D-printed custom disks (P=.180)
Conclusions
Movement of artificial teeth during the manufacture of dentures using the custom disk
method and custom disks with milled recesses was within a clinically acceptable range.
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Article info
Publication history
Published online: December 01, 2022
Publication stage
In Press Corrected ProofFootnotes
Funding: Supported by JSPS KAKENHI, Japan, Grant Number JP20K18592 and research fund provided by DGSHAPE Corporation, Japan.
Identification
Copyright
© 2022 by the Editorial Council for The Journal of Prosthetic Dentistry.
