Conformation effect on the mechanical and microbiological behavior of invisible orthodontic aligners
Autor/a
Barrera Mora, José María
Fecha de publicación
2024ISSN
1996-1944
Resumen
Invisible orthodontic aligners are having a great impact on tooth movement in an aesthetic and effective way. Different techniques, models, and clinical aspects have been studied for their proper use. However, the aim of this research has been to determine the effect of the shaping process on mechanical properties and their bacterial behavior. For this study, 40 original polyurethane plates and 40 identical models, obtained by hot forming the original plates, were used. The static tensile mechanical properties were studied with a Zwick testing machine using testing speeds of 5 mm/min at a temperature of 37 °C. The original plate and the aligner have been studied with a creep test by subjecting the samples to a constant tension of 30 N, and determining the elongation using a long-distance, high-resolution microscope at different time periods between 1 and 720 h. Studies of water absorption has been realized with artificial saliva for 5 h. Bacterial cultures of Streptococcus oralis and Actinomyces viscosus strains were grown on the original plates and on new and used models, to determine the proliferation of each bacterium through metabolic activity, colony-forming units, and LIVE/DEAD assays. The mechanical results showed an increase in the strength of the inserts with respect to the models obtained from 3.44 to 3.95 MPa in the elastic limit and a lower deformation capacity. It has been proven that the transition zone in the creep curves lasts longer in the original plate, producing the rapid increase in deformation at a shorter time (400 h) in the aligner. Therefore, the shaping process reduces the time of dental correction exerted by the aligner. The results of the bacterial culture assays show an increase in the number of bacterial colonies when the aligners have been used and when the polyurethane is conformed due to the internal energy of the model, with respect to the original polyurethane. It has been observed that between the original plate and the aligner there are no statistically significant differences in water absorption and therefore the forming process does not affect water absorption. A slight increase in water absorption can be observed, but after five hours of exposure, the increase is very small.
Tipo de documento
Artículo
Versión del documento
Versión publicada
Lengua
English
Materias (CDU)
616.3 - Patología del aparato digestivo. Odontología
Palabras clave
Poliuretà
Alineadors invisibles
Propietats mecàniques
Conformació
Poliuretano
Alineadores invisibles
Propiedades mecánicas
Conformación
Polyurethane
Invisible aligners
Mechanical properties
Conformation
Páginas
12
Publicado por
MDPI
Colección
17; 6
Publicado en
Materials
Citación
Rodríguez Fernández, Juan Carlos; Pastor, Francisco; Barrera Mora, José María [et al.]. Conformation effect on the mechanical and microbiological behavior of invisible orthodontic aligners. Materials, 2024, 17(6), 1360. Disponible en: <https://www.mdpi.com/1996-1944/17/6/1360>. Fecha de acceso: 23 may. 2024. DOI: 10.3390/ma17061360
Este ítem aparece en la(s) siguiente(s) colección(ones)
- Odontologia [245]
Derechos
© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Excepto si se señala otra cosa, la licencia del ítem se describe como https://creativecommons.org/licenses/by/4.0/