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Thermo-mechanical properties of 3D printed photocurable shape memory resin for clear aligners

 Se Yeon Lee  ;  Hoon Kim  ;  Hyun-Joong Kim  ;  Chooryung J Chung  ;  Yoon Jeong Choi  ;  Su-Jung Kim  ;  Jung-Yul Cha 
 SCIENTIFIC REPORTS, Vol.12(1) : 6246, 2022-04 
Journal Title
Issue Date
Mechanical Phenomena ; Orthodontic Appliances, Removable* ; Printing, Three-Dimensional ; Tooth*
To overcome the limitations of the conventional vacuum thermoforming manufacturing method, direct 3D printing of clear aligners has been developed. The present study investigated the thermo-mechanical and viscoelastic properties of a photocurable resin TC-85, which is a new material for the direct 3D printed clear aligners, comparing to a conventional thermoplastic material polyethylene terephthalate glycol. Dynamic mechanical analysis was performed to analyse the mechanical behaviours of the two materials at 37 °C and 80 °C, respectively. Furthermore, the shape memory property of the two materials was evaluated using a U-shape bending test, and the shape recovery ratio for 60 min at 37 °C was calculated. The results indicate that TC-85 can constantly apply a light force to the teeth when used for the 3D printed clear aligners, owing to its flexibility and viscoelastic properties. In addition, it is expected that the force decay induced by repeated insertion of the clear aligners will be reduced and a constant orthodontic force will be maintained. Furthermore, its geometric stability at high temperatures and the shape memory properties provide advantages for the clinical application.
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2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Chung, Chooryung J.(정주령) ORCID logo https://orcid.org/0000-0001-9399-7193
Cha, Jung Yul(차정열)
Choi, Yoon Jeong(최윤정) ORCID logo https://orcid.org/0000-0003-0781-8836
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