Thermoplastic Disks Used for Commercial Orthodontic Aligners: Complete Physicochemical and Mechanical Characterization

Materials

卷:13

Vincenzo Campanella¹  Enrico Quagliarini²  Massimo Messori³  Gianluca Chiappini⁴  Giuliana Taglieri⁵  Alessandra Di Giambattista⁵  Valeria Daniele⁵  Ludovico Macera⁵  Giuseppe Spagnoli⁵  Alessandra Massaria⁶  Giuseppe Marzo⁶  Vincenzo Quinzi⁶  Stefano Mummolo⁶  Enrico Marchetti⁶ 

[1] Department of Clinical Science and Translational Medicine, University of Rome “Tor Vergata”, Via Montpellier 1, 00133 Rome, Italy;

[2] Department of Construction, Civil Engineering and Architecture, Polytechnic University of Marche, 60121 Ancona, Italy;

[3] Department of Engineering ‘Enzo Ferrari’, University of Modena and Reggio Emilia, Via P. Vivarelli 10, 41125 Modena, Italy;

[4] Department of Industrial Engineering and Mathematical Sciences, Polytechnic University of Marche, via Brecce Bianche snc, 60131 Ancona, Italy;

[5] Department of Industrial and Information Engineering and Economics, University of L’Aquila, Piazzale Pontieri 1, Monteluco di Roio, 67100 L’Aquila, Italy;

[6] Department of Life, Health & Environmental Sciences, Postgraduate School of Orthodontics, University of L’Aquila, P.le Salvatore Tommasi 1, Ed. Delta 6, 67100 Coppito L’Aquila, Italy;

关键词: thermoplastic materials;    invisible orthodontic appliances;    physicochemical characterization;    mechanical properties;    colour change evaluations;    water absorption behaviour;   

DOI  :  10.3390/ma13102386

来源: DOAJ

【 摘 要 】

Invisible orthodontic aligners (IOAs) have been introduced in the orthodontic field as an innovative alternative for fixed brackets, in relation to their ability to be easily inserted/removed from the oral cavity without affecting the chewing ability and the aesthetic of the patients. The paper provides a complete physicochemical and mechanical characterization of thermoplastic materials in the form of disks used for commercial IOAs. A wide palette of specific techniques is considered, from tensile tests and dynamic-mechanical analysis, to X-Ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transformation infrared spectroscopy (FTIR-ATR) analyses and water absorption tests. The disks are investigated before and after immersion into staining beverages (red wine, coffee, nicotine and artificial saliva), in terms of colour variations, transparency, and microscopic surface modifications by means of colorimetry, UV-VIS absorbance and scanning electron microscopy (SEM). Among all the samples, polyurethane (PU) exhibited the highest crystallinity and the highest values of mechanical and thermal resistance, while the poly(ethylene terephthalate)-glycol (PETG) samples presented better transparency and less ability to absorb water. Moreover, red wine and coffee give noticeable colour variations after 14 days of immersion, together with a slight reduction of transparency.

【 授权许可】

Unknown