Mechanical properties of “two generations” of teeth aligners: Change analysis during oral permanence

Roberta CONDO’; Luca PAZZINI; Loredana CERRONI; Guido PASQUANTONIO; Giuseppina LAGANA’; Alessandro PECORA; Valentina MUSSI; Antonio RINALDI; Barbara MECHERI; Silvia LICOCCIA; Luca MAIOLO

doi:10.4012/dmj.2017-323

Original Paper

Mechanical properties of “two generations” of teeth aligners: Change analysis during oral permanence

Roberta CONDO’, Luca PAZZINI, Loredana CERRONI, Guido PASQUANTONIO, Giuseppina LAGANA’, Alessandro PECORA, Valentina MUSSI, Antonio RINALDI, Barbara MECHERI, Silvia LICOCCIA, Luca MAIOLO

Author information

Roberta CONDO’
Department of Clinical Sciences and Translational Medicine, University of Rome “Tor Vergata”, Via Montpellier
Luca PAZZINI
Institute for Microelectronics and Microsystems —National Research Council (IMM-CNR) Via del Fosso del Cavaliere
Loredana CERRONI
Department of Clinical Sciences and Translational Medicine, University of Rome “Tor Vergata”, Via Montpellier
Guido PASQUANTONIO
Department of Clinical Sciences and Translational Medicine, University of Rome “Tor Vergata”, Via Montpellier
Giuseppina LAGANA’
Department of Clinical Sciences and Translational Medicine, University of Rome “Tor Vergata”, Via Montpellier
Alessandro PECORA
Institute for Microelectronics and Microsystems —National Research Council (IMM-CNR) Via del Fosso del Cavaliere
Valentina MUSSI
Institute of Complex Systems —National Research Council (ISC-CNR) Via del Fosso del Cavaliere
Antonio RINALDI
ENEA —Technical Unit for Material Technologies (UTTMAT) Casaccia Research Center, Via Anguillarese
Barbara MECHERI
Department of Chemical Science and Technology, University of Rome “Tor Vergata”
Silvia LICOCCIA
Department of Chemical Science and Technology, University of Rome “Tor Vergata”
Luca MAIOLO
Institute for Microelectronics and Microsystems —National Research Council (IMM-CNR) Via del Fosso del Cavaliere

Keywords: Invisalign^®, Indentation and tensile strength test, Fourier transform infrared spectroscopy, Micro-Raman spectroscopy, X-ray diffraction

JOURNAL FREE ACCESS

2018 Volume 37 Issue 5 Pages 835-842

DOI https://doi.org/10.4012/dmj.2017-323

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Details

Abstract

Aim of this in vitro study was to analyze structural properties of two different polymeric orthodontic aligners, Exceed30 (EX30) and Smart Track (LD30), before and after use. Forty patterns of aligners were randomly selected: 20 LD30 and 20 EX30, worn intra-orally for 14±3 days, 22 h/day. From each aligner, 10 specimens were prepared from buccal surfaces of the incisor region by the cutting of samples 5×5 mm under a stereomicroscope. All samples were subjected to Fourier transform infrared spectroscopy, micro-Raman spectroscopy, X-ray diffraction, tensile and indentation strength test. LD30 appeared more homogeneous, with a crystalline fraction lower than EX30 and exhibited a higher elastic behavior and a lower tendency to warp after use than EX30. LD30 demonstrated better adaptability to the dental arch and greater consistency of application of orthodontic forces than produced with EX30. However, both materials showed structural modifications that resulted in increased sample hardness and hyper-plasticity.

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