Dentaltown May 2022 - 34

3D printers
Advances in desktop 3D printing,
introduction of various digital software
packages to move teeth, and availability
of various thermoforming plastic fi lms all
contributed to adoption of in-house protocols
to fabricate aligners. This trend aligns with
3D-printing most dental appliances in-offi ce
as part of opting for digital dentistry.
Most desktop 3D printers use one of
seven printing technologies: vat photopolymerization
(also known as stereolithography,
or SLA); material extrusion; material jetting;
binder jetting; powder-bed fusion; directedenergy
deposition; or sheet lamination.
In dentistry, the most commonly used is
vat photopolymerization, followed by a
metal-selective laser-sintering process.
This article focuses on vat photopolymerization
3D printers, which use
ultraviolet-spectrum light to cure photosensitive
liquid resin. The vat photopolymerization
process is divided into three subgroups: laser
beam or classic SLA; direct light processing
(DLP); and LCD-masked SLA (Fig. 1).
Independent of the printing technology,
all 3D-printed objects at this time are
fabricated in an incremental process of layerby-layer
deposition. Attempts at volumetric
3D printing are promising.1
Laser beam (classic SLA): The stereolithography
3D-printing concept-also
earlier referred to as rapid prototyping-was
introduced by Charles Hull in the 1980s.
SLA printers follow the same structure:
A beam of laser is guided through two
mirrors and projected on the membrane,
the transparent base of a tank. The polymerization
process occurs close to the beam
of light. Basically, each layer of 3D-printed
parts is fabricated through an incremental
brush-like process.
Form 3 SLA printers by Formlabs are
now the dominant SLA 3D printers in
dentistry. Form 3 models are equipped
with low-force stereolithography (LFS), a
redesigned light-processing unit (LPU),
and software improvements over previous
versions. These collective changes put Form 3
printers in good position to partially fulfi ll
the 3D-printing needs of an IOA system.
34 MAY 2022 // dentaltown.com
Laser beam (SLA)
Fig. 1: Schematic representation of three common vat photopolymerization 3D-printing technologies.
(Courtesy of Mary Farahzadi)
Direct light processing (DLP)
Masked (LCD)

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Dentaltown May 2022

Table of Contents for the Digital Edition of Dentaltown May 2022

Dentaltown May 2022 - Intro
Dentaltown May 2022 - Cover1
Dentaltown May 2022 - Cover2
Dentaltown May 2022 - 1
Dentaltown May 2022 - 2
Dentaltown May 2022 - 3
Dentaltown May 2022 - 4
Dentaltown May 2022 - 5
Dentaltown May 2022 - 6
Dentaltown May 2022 - 7
Dentaltown May 2022 - 8
Dentaltown May 2022 - 9
Dentaltown May 2022 - 10
Dentaltown May 2022 - 11
Dentaltown May 2022 - 12
Dentaltown May 2022 - 13
Dentaltown May 2022 - 14
Dentaltown May 2022 - 15
Dentaltown May 2022 - 16
Dentaltown May 2022 - 17
Dentaltown May 2022 - 18
Dentaltown May 2022 - 19
Dentaltown May 2022 - 20
Dentaltown May 2022 - 21
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Dentaltown May 2022 - 55
Dentaltown May 2022 - 56
Dentaltown May 2022 - Cover3
Dentaltown May 2022 - Cover4
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