Abstract
OBJECTIVE
To investigate alterations in the mechanical properties of in-house three-dimensional (3D) printed orthodontic aligners after intraoral ageing.
MATERIALS AND METHODS
Sixteen 3D-printed aligners (TC-85DAC resin, Graphy, Seoul, Korea) were used for the purpose of the study, which were divided into 10 control (not used) aligners and 6 materials retrieved from 4 patients after 1-week service (retrieved group). Samples from the control group were analysed by attenuated total reflectance-Fourier-transform infrared (ATR-FTIR) spectroscopy. Samples from control/retrieved groups were embedded resin and subjected to instrumented indentation testing (IIT) to record force-indentation depth curves, calculating the following (as per ISO 14577-1, 2002 standard): Martens hardness (HM), indentation modulus (EIT), and elastic index (ηIT), and the indentation relaxation index (RIT). Differences between control and retrieved 3D-printed aligners were checked with Mann-Whitney/t-tests at an alpha = 5%.
RESULTS
ATR-FTIR analysis showed that aligners were made of a vinyl ester-urethane material. The results of the IIT testing were: HM (control: median 91.5 N/mm2, interquartile range [IQR] 88.0-93.0/as-retrieved: median 90.5 N/mm2, IQR 89.0-93.0); EIT (control, mean 2616.3 MPa, standard deviation [SD] 107.0 MPa/retrieved, mean 2673.2 MPa, SD 149.4 MPa); ηIT (control: median 28.6%, IQR 28.2-30.9%/as-retrieved: median 29.0%, IQR 28.7-29.2%); and RIT (control: median 45.5%, IQR 43.0-47.0%/as-retrieved: median 45.1%, IQR 45.0-45.3%). No differences between as-retrieved and control aligners were found for any of the mechanical properties tested (P > 0.05 in all instances).
CONCLUSION
The mechanical properties of the in-house 3D-printed aligners tested were not affected after 1 week in service period.
Abstract
OBJECTIVE
To investigate alterations in the mechanical properties of in-house three-dimensional (3D) printed orthodontic aligners after intraoral ageing.
MATERIALS AND METHODS
Sixteen 3D-printed aligners (TC-85DAC resin, Graphy, Seoul, Korea) were used for the purpose of the study, which were divided into 10 control (not used) aligners and 6 materials retrieved from 4 patients after 1-week service (retrieved group). Samples from the control group were analysed by attenuated total reflectance-Fourier-transform infrared (ATR-FTIR) spectroscopy. Samples from control/retrieved groups were embedded resin and subjected to instrumented indentation testing (IIT) to record force-indentation depth curves, calculating the following (as per ISO 14577-1, 2002 standard): Martens hardness (HM), indentation modulus (EIT), and elastic index (ηIT), and the indentation relaxation index (RIT). Differences between control and retrieved 3D-printed aligners were checked with Mann-Whitney/t-tests at an alpha = 5%.
RESULTS
ATR-FTIR analysis showed that aligners were made of a vinyl ester-urethane material. The results of the IIT testing were: HM (control: median 91.5 N/mm2, interquartile range [IQR] 88.0-93.0/as-retrieved: median 90.5 N/mm2, IQR 89.0-93.0); EIT (control, mean 2616.3 MPa, standard deviation [SD] 107.0 MPa/retrieved, mean 2673.2 MPa, SD 149.4 MPa); ηIT (control: median 28.6%, IQR 28.2-30.9%/as-retrieved: median 29.0%, IQR 28.7-29.2%); and RIT (control: median 45.5%, IQR 43.0-47.0%/as-retrieved: median 45.1%, IQR 45.0-45.3%). No differences between as-retrieved and control aligners were found for any of the mechanical properties tested (P > 0.05 in all instances).
CONCLUSION
The mechanical properties of the in-house 3D-printed aligners tested were not affected after 1 week in service period.
Additional indexing
Item Type: | Journal Article, refereed, original work |
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Communities & Collections: | 04 Faculty of Medicine > Center for Dental Medicine > Clinic for Orthodontics and Pediatric Dentistry |
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Dewey Decimal Classification: | 610 Medicine & health |
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Scopus Subject Areas: | Health Sciences > General Medicine |
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Language: | English |
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Date: | 25 January 2022 |
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Deposited On: | 22 Dec 2022 16:33 |
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Last Modified: | 29 Nov 2023 02:39 |
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Publisher: | Oxford University Press |
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ISSN: | 0141-5387 |
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Additional Information: | This is a pre-copy-editing, author-produced PDF of an article accepted for publication in The European Journal of Orthodontics following peer review. The definitive publisher-authenticated version Can, Esad; Panayi, Nearchos; Polychronis, Georgios; Papageorgiou, Spyridon N; Zinelis, Spiros; Eliades, George; Eliades, Theodore (2022). In-house 3D-printed aligners: effect of in vivo ageing on mechanical properties. European Journal of Orthodontics, 44(1):51-55 is available online at: https://academic.oup.com/ejo/article/44/1/51/6265460?login=true |
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OA Status: | Green |
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Publisher DOI: | https://doi.org/10.1093/ejo/cjab022 |
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PubMed ID: | 33950232 |
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