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

Dental Materials Journal
Roberta Condo'Luca Maiolo

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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Citations

May 14, 2020·Dentistry Journal·Francesco TamburrinoArmando Viviano Razionale
Nov 26, 2020·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·Tiantong LouIacopo Cioffi
Jan 22, 2021·The Angle Orthodontist·Edoardo MantovaniTommaso Castroflorio
Jun 25, 2021·BMC Oral Health·Roberta CondòLuca Maiolo
Aug 3, 2021·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·Mary GriffithToru Deguchi
Dec 10, 2021·Journal of Orofacial Orthopedics = Fortschritte Der Kieferorthopädie : Organ/official Journal Deutsche Gesellschaft Für Kieferorthopädie·Fayez ElkholyBernd G Lapatki

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