Dental Materials Journal
Online ISSN : 1881-1361
Print ISSN : 0287-4547
ISSN-L : 0287-4547
Original Paper
Mechanical properties of “two generations” of teeth aligners: Change analysis during oral permanence
Roberta CONDO’Luca PAZZINILoredana CERRONIGuido PASQUANTONIOGiuseppina LAGANA’Alessandro PECORAValentina MUSSIAntonio RINALDIBarbara MECHERISilvia LICOCCIALuca MAIOLO
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2018 Volume 37 Issue 5 Pages 835-842

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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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© 2018 The Japanese Society for Dental Materials and Devices
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