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EVALUATION OF THE ACCURACY OF DENTAL MODELS FABRICATED BY VARIOUS 3D PRINTERS
다양한 3D 프린터로 제작한 치과 모형의 정확도 평가

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Authors
전진
Advisor
허성주
Major
치의학대학원 치의과학과
Issue Date
2018-02
Publisher
서울대학교 대학원
Keywords
accuracyadditive manufacturingdental modelrapid prototyping3-dimensional printing
Description
학위논문 (박사)-- 서울대학교 대학원 : 치의학대학원 치의과학과, 2018. 2. 허성주.
Abstract
the mean
deviations gradually decreased as the position shifted rightward. In contrast, SLA
and Polyjet showed the most negative deviations in the left second molar position
in the X-axis and values gradually increased as the position shifted rightward. In
the Y-axis, FDM exhibited forward deviations on the right side and DLP showed
backward deviations in the anterior site and forward deviations in the posterior site.
In the Z-axis, all printers showed little deviation in canine and premolar regions,
with maximum deviation in second molar sites. The total linear deviation was
lowest in the left canine region and deviations increased with distance from this site
in all groups.
Conclusion. FDM showed more systemic deviations than DLP, Polyjet and SLA in
the superimposition study, but all printed models were within a clinically acceptable
range. Bucco-lingually, FDM and DLP showed expansion while Polyjet and SLA
showed contraction. Anterior-posteriorly, FDM generally showed forward
deviations and DLP showed forward deviations in the molar region and backward
deviations in the anterior region. In the vertical dimension, there were no significant
deviations in the anterior region but significant deviations were found in the molar
region. For all printers, total linear deviations were lowest in the anterior region and
became larger as the position moved backwards.
ABSTRACT
EVALUATION OF THE ACCURACY OF DENTAL
MODELS FABRICATED BY VARIOUS 3D PRINTERS
Jin Jeon, D.D.S., M.S.
Department of Prosthodontics,
Graduate School, Seoul National University
(Directed by Professor Seong-Joo Heo, D.D.S., M.S.D., Ph.D.)
Objectives. Optical impressions obtained with an intraoral scanner and prosthesis
fabrication using computer-aided design (CAD)/computer-aided manufacturing
(CAD) were introduced into the field of dentistry in the early 1980s. With the recent
development and increasing popularity of intraoral scanners, direct digital
acquisition of the dental arch in the mouth has become more readily available,
omitting the step of conventional impression acquisition. In some simple cases,
physical models are not required with digital impressions
however, physical dental
models are mandatory in many extensive cases. Rapid prototyping or 3D printing
can be used to fabricate models from digital impression data. The purpose of this
study was to evaluate the dimensional accuracy and reproducibility of
compartments in full arch models made with various 3D printing methods including
digital light processing (DLP), fused deposition modeling (FDM),
stereolithography (SLP) and photopolymer jetting (Polyjet).
Material and Methods. The mandibular model was modified to generate reference
CAD data in reverse engineering software. To simulate an implant scan body, 6
cylinders were placed in the left and right canines (#33, #43), second premolars
(#35, #45) and second molars (#37, #47). The cylinders in the left (#37) and right
second molars (#47) were designed to have mesial and distal angulation of 30° to
simulate off-axis implant angulations. Three additional reference spheres were
placed around the left second molar (#37) to set coordinates for deviations. Ten
models were printed with 4 different printers and 5 materials using the CAD data
file. The printed models were scanned with a model scanner and merged with the
original CAD data. Difference color maps were used to evaluate deviations and
surface textures were examined with photographs and scanning electron
microscopy. The systemic mean deviations of models from each 3D printer were
analyzed in a superimposition study. Deviations at different cylinder locations in
the X-, Y-, and Z-axes, and total linear deviations were analyzed in a coordinate
study.
Results. In the superimposition study, FDM yielded the highest mean deviations
with statistical significance (p < 0.05). There were no significant differences among
the other printer groups. In the coordinate study, FDM and DLP showed the most
positive deviations in the left second molar position in the X-axis
Language
English
URI
https://hdl.handle.net/10371/141188
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dental Science(치의과학과)Theses (Ph.D. / Sc.D._치의과학과)
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