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Article

Mechanical Properties of Thermoplastic Polymers for Aligner Manufacturing: In Vitro Study

1
DICI—Department of Civil and Industrial Engineering, Università di Pisa, 56122 Pisa, Italy
2
Department of Neurosciences, Reproductive Sciences and Oral Sciences, Università di Napoli Federico II, 80131 Napoli, Italy
3
Unit of Orthodontics, Department of Biomedical and Neuromotor Sciences (DIBINEM), Università di Bologna, 40125 Bologna, Italy
*
Author to whom correspondence should be addressed.
Dent. J. 2020, 8(2), 47; https://doi.org/10.3390/dj8020047
Received: 8 April 2020 / Revised: 6 May 2020 / Accepted: 7 May 2020 / Published: 10 May 2020
(This article belongs to the Special Issue Dental Ceramics and Metal-Free Materials in The Digital Workflow)
The use of metal-free thermoplastic materials plays a key role in the orthodontic digital workflow due to the increasing demand for clear aligner treatments. Three thermoplastic polymers commonly used to fabricate clear aligners, namely Duran®, Biolon® and Zendura®, were investigated to evaluate the effect of thermoforming (T.), storage in artificial saliva (S.A.S.) and their combination on their mechanical properties. Elastic modulus and yield stress of the specimens were characterized. Each material was characterized for each condition through tensile tests (ISO527-1). The results showed that thermoforming does not lead to a significant decrease in yield stress, except for Zendura® that showed about a 30% decrease. An increase of the elastic modulus of Duran® and Zendura®, instead, was observed after thermoforming. The same increase was noticed for the yield stress of Duran®. For S.A.S. specimens, the elastic modulus generally decreases compared to supplier condition (A.S.) and simply thermoformed material. A decrease of yield stress, instead, is significant for Zendura®. The results demonstrated that the impact of the operating conditions on the mechanical properties can vary according to the specific polymer. To design reliable and effective orthodontic treatments, the materials should be selected after their mechanical properties are characterized in the simulated intraoral environment. View Full-Text
Keywords: orthodontic aligners; thermoplastic polymers; mechanical properties; simulated oral environment orthodontic aligners; thermoplastic polymers; mechanical properties; simulated oral environment
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MDPI and ACS Style

Tamburrino, F.; D’Antò, V.; Bucci, R.; Alessandri-Bonetti, G.; Barone, S.; Razionale, A.V. Mechanical Properties of Thermoplastic Polymers for Aligner Manufacturing: In Vitro Study. Dent. J. 2020, 8, 47. https://doi.org/10.3390/dj8020047

AMA Style

Tamburrino F, D’Antò V, Bucci R, Alessandri-Bonetti G, Barone S, Razionale AV. Mechanical Properties of Thermoplastic Polymers for Aligner Manufacturing: In Vitro Study. Dentistry Journal. 2020; 8(2):47. https://doi.org/10.3390/dj8020047

Chicago/Turabian Style

Tamburrino, Francesco, Vincenzo D’Antò, Rosaria Bucci, Giulio Alessandri-Bonetti, Sandro Barone, and Armando V. Razionale 2020. "Mechanical Properties of Thermoplastic Polymers for Aligner Manufacturing: In Vitro Study" Dentistry Journal 8, no. 2: 47. https://doi.org/10.3390/dj8020047

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