The effect of time on mechanical properties of biocompatible photopolymer resins used for fabrication of clear dental aligners

Aleksa Milovanović; Aleksandar Sedmak; Zorana Golubović; Ksenija Zelić Mihajlović; Aleksandar Žurkić; Isaak Trajković; Miloš Milošević

doi:10.1016/j.jmbbm.2021.104494

The effect of time on mechanical properties of biocompatible photopolymer resins used for fabrication of clear dental aligners

J Mech Behav Biomed Mater. 2021 Jul:119:104494. doi: 10.1016/j.jmbbm.2021.104494. Epub 2021 Mar 26.

Authors

Aleksa Milovanović¹, Aleksandar Sedmak², Zorana Golubović², Ksenija Zelić Mihajlović³, Aleksandar Žurkić⁴, Isaak Trajković⁵, Miloš Milošević⁵

Affiliations

¹ University of Belgrade, Innovation Center of the Faculty of Mechanical Engineering, Belgrade, Serbia. Electronic address: amilovanovic@mas.bg.ac.rs.
² University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia.
³ University of Belgrade, School of Medicine, Institute of Anatomy, Laboratory for Anthropology Belgrade, Serbia.
⁴ Shimadzu Corp. (Kyoto, Japan), Branch Belgrade, Serbia.
⁵ University of Belgrade, Innovation Center of the Faculty of Mechanical Engineering, Belgrade, Serbia.

PMID: 33813333
DOI: 10.1016/j.jmbbm.2021.104494

Abstract

Clear dental aligners are used for treating orthodontic anomalies (misaligned teeth, inappropriate contact between upper and lower teeth etc.), minor irregularities and bruxism. Using additive manufacturing technologies clear dental aligners are made of biocompatible photopolymer, using a vat photopolymerization technology. One of problems in application is the change of aligner material properties after production, including strength and elongation at failure. This can cause different sequence of tooth displacement which will not correspond to the planned therapy. In this paper three types of material testing are conducted i.e., tensile, compressive and three-point bending testing on specimens of 1 (24 h), 3 (72 h), 5 (120 h) and 7 (168 h) days old. Mechanical properties, such as tensile, compressive and flexural strength and strain at failure are monitored in order to show the effect of time on biocompatible photopolymer resin.

Keywords: Additive manufacturing; Biocompatible polymers; Dental aligners; Mechanical properties.; Time Effect.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Composite Resins*
Materials Testing
Stress, Mechanical

Substances

Composite Resins