A study of biocomposite resins for creating orthodontic appliances using a 3D printer

Kakami, Chifumi; Nakano, Haruhisa; Hotta, Yuji; Miyazaki, Takashi; Maki, Koutaro

doi:10.1016/j.odw.2017.04.002

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…The SLA methods showed significantly higher water absorption and solubility values compared to other 3D-printing and manual methods. This result is consistent with previous studies [21]. The mean absorption of the SLA method was 52.31 µg/mm 3 , which is about a 2.8-fold increase compared to that of the manual method, which has a value of 18.51 µg/mm 3 .…”

Section: Discussionsupporting

confidence: 93%

Which Three-Dimensional Printing Technology Can Replace Conventional Manual Method of Manufacturing Oral Appliance? A Preliminary Comparative Study of Physical and Mechanical Properties

et al. 2021

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Three-dimensional printing technology is widely being adopted in the manufacturing of oral appliances. The purpose of this study was to determine the most suitable method of manufacturing oral appliances by comparing the physical and mechanical properties of various 3D printing methods with the conventional method. Experimental groups consisted of six 3D-printed specimens via FDM, two polyjets, SLS, SLA, and DLP, and the milling methods. The control group consisted of an acrylic resin specimen made by the conventional manual method. The water absorption and solubility, color stability, flexural strength, and surface hardness were tested and statistically analyzed. The FDM, SLS, and DLP methods exhibited comparable water absorption and solubility with the control group, and only the SLA method exhibited significantly higher water solubility than the control group. In terms of the color stability, only the milling method met the requirements of the allowable clinical range. The FDM, SLA, and DLP methods exhibited comparable flexural strength with the control group. The surface hardness of the PJ-2, DLP, and milling methods was acceptable for replacing conventional manual method. Therefore, the most suitable method of manufacturing oral appliances among the experimental groups was the DLP method in terms of its water absorption and solubility, flexural strength, and surface hardness.

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Section: Discussionsupporting

confidence: 93%

Which Three-Dimensional Printing Technology Can Replace Conventional Manual Method of Manufacturing Oral Appliance? A Preliminary Comparative Study of Physical and Mechanical Properties

et al. 2021

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“…To meet the specifications of ISO20795-2, the base polymers used for orthodontic devices must have flexural strength of at least 50 MPa and a flexural modulus of at least 1,300 MPa (1.3 GPa). In a study of orthodontic device biocomposite resins for use with 3D printers, Kakami [18] stated that despite the large amount of water absorption, the mechanical properties were considered to be sufficient for use as a Hotz plate.…”

Section: Mechanical Experimentsmentioning

confidence: 99%

Development of Biocompatible Resins for 3D Printing of Direct Aligners

Nakano

Kato

Kakami

et al. 2019

J. Photopol. Sci. Technol.

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The objective of this study was to develop biologically compatible resins with optimum safety profiles and physical properties that can be used for long periods inside the mouth, and to attempt to use these resins in a 3D printing process to produce direct aligners for use in mouthpiece orthodontics. Low toxicity water-soluble monomers (1M) were used to develop 3D printer-compatible biocompatible resins (polymers) that have no skin reactivity, carcinogenicity, or reproductive toxicity. Cytotoxicity testing (LDH test), proliferation testing (WST1 test), and mechanical testing were also performed. We attempted to use these resins to produce direct aligners. We successfully produced acrylic-epoxy hybrid light-curing resins that have optimal safety profiles composed of water-soluble monomers alone. The results of cytotoxicity testing and proliferation testing showed that all the water-soluble monomers used for 3D printing (3D-1M) exhibited low cytotoxicity, but the cell survival rates suggested that the composition ratio of the raw materials may be an issue. The results of mechanical testing demonstrated that the 3D-1M met the mechanical strength requirements for base polymers used in orthodontics. We successfully produced direct aligners using these biocompatible resins. However, their middle sections were fragile, suggesting that their physical properties must be improved if they are to be used in aligners. We intend to improve the mechanical properties of these monomers, and perform safety testing for approval as Class-II controlled medical devices.

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A study of biocomposite resins for creating orthodontic appliances using a 3D printer

Cited by 2 publications

References 9 publications

Which Three-Dimensional Printing Technology Can Replace Conventional Manual Method of Manufacturing Oral Appliance? A Preliminary Comparative Study of Physical and Mechanical Properties

Which Three-Dimensional Printing Technology Can Replace Conventional Manual Method of Manufacturing Oral Appliance? A Preliminary Comparative Study of Physical and Mechanical Properties

Development of Biocompatible Resins for 3D Printing of Direct Aligners

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