Εffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitro
Abstract Background The aim of the study was to investigate the effect of three aligner cleaners on the composition and mechanical properties of two types of orthodontic aligners. Materials and methods The cleaners tested were two alkaline peroxide solutions (Retainer Brite—RB; Retainer Cleaner—RC)...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-12-01
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| Series: | Progress in Orthodontics |
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| Online Access: | https://doi.org/10.1186/s40510-022-00449-w |
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| author | Anna Iliadi Vera Enzler Georgios Polychronis Timo Peltomaki Spiros Zinelis Theodore Eliades |
| author_facet | Anna Iliadi Vera Enzler Georgios Polychronis Timo Peltomaki Spiros Zinelis Theodore Eliades |
| author_sort | Anna Iliadi |
| collection | DOAJ |
| description | Abstract Background The aim of the study was to investigate the effect of three aligner cleaners on the composition and mechanical properties of two types of orthodontic aligners. Materials and methods The cleaners tested were two alkaline peroxide solutions (Retainer Brite—RB; Retainer Cleaner—RC) and one peroxide-free (Steraligner—ST) and the aligners Clear Aligner (C, polyester) and Invisalign (I, polyester–urethane). The aligners were immersed in the cleaner solutions as instructed every day (15 min for RB, RC; 5 min for ST) for a two-week period. The acidity of the solutions was tested with a pH meter. The changes in the chemical composition of the aligners were studied by attenuated total-reflection Fourier transform infrared spectrometry (ATR-FTIR), while Instrumented Indentation Testing (IIT) was used for assessment of changes in Martens Hardness (HM), modulus (EIT), elastic index (nIT) and relaxation (RIT). Results RB and RC were weakly acidic (pH = 6.3), whereas ST was mildly acidic (pH = 4.8). The ATR-FTIR analysis demonstrated evidence of acidic hydrolysis of C in ST and I in RB. The IIT-derived properties of I were not affected by the cleaners. However, for C a significant change was found in HM (all cleaners), nIT (all cleaners) and RIT (RB, ST). Although the chemical changes support a hydrolytic material deterioration, the results of mechanical properties may interfere with the material residual stresses during fabrication. Conclusions Caution should be exerted in the selection of aligner cleaners. The mild acidic cleanser was more aggressive to the polyester, whereas an alkaline peroxide to the polyester–urethane aligner. |
| first_indexed | 2024-04-12T01:29:32Z |
| format | Article |
| id | doaj.art-5bad6c91554849449922c0ad1c0e769b |
| institution | Directory Open Access Journal |
| issn | 2196-1042 |
| language | English |
| last_indexed | 2024-04-12T01:29:32Z |
| publishDate | 2022-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Progress in Orthodontics |
| spelling | doaj.art-5bad6c91554849449922c0ad1c0e769b2022-12-22T03:53:32ZengSpringerOpenProgress in Orthodontics2196-10422022-12-0123111010.1186/s40510-022-00449-wΕffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitroAnna Iliadi0Vera Enzler1Georgios Polychronis2Timo Peltomaki3Spiros Zinelis4Theodore Eliades5Department of Biomaterials, School of Dentistry, National and Kapodistrian University of AthensClinic of Orthodontics and Pediatric Dentistry, Center of Dental Medicine, University of ZurichDepartment of Biomaterials, School of Dentistry, National and Kapodistrian University of AthensDepartment of Oral and Maxillofacial Diseases, Tampere University Hospital, Tampere, Finland Faculty of Medicine and Health Technology, Tampere UniversityDepartment of Biomaterials, School of Dentistry, National and Kapodistrian University of AthensClinic of Orthodontics and Pediatric Dentistry, Center of Dental Medicine, University of ZurichAbstract Background The aim of the study was to investigate the effect of three aligner cleaners on the composition and mechanical properties of two types of orthodontic aligners. Materials and methods The cleaners tested were two alkaline peroxide solutions (Retainer Brite—RB; Retainer Cleaner—RC) and one peroxide-free (Steraligner—ST) and the aligners Clear Aligner (C, polyester) and Invisalign (I, polyester–urethane). The aligners were immersed in the cleaner solutions as instructed every day (15 min for RB, RC; 5 min for ST) for a two-week period. The acidity of the solutions was tested with a pH meter. The changes in the chemical composition of the aligners were studied by attenuated total-reflection Fourier transform infrared spectrometry (ATR-FTIR), while Instrumented Indentation Testing (IIT) was used for assessment of changes in Martens Hardness (HM), modulus (EIT), elastic index (nIT) and relaxation (RIT). Results RB and RC were weakly acidic (pH = 6.3), whereas ST was mildly acidic (pH = 4.8). The ATR-FTIR analysis demonstrated evidence of acidic hydrolysis of C in ST and I in RB. The IIT-derived properties of I were not affected by the cleaners. However, for C a significant change was found in HM (all cleaners), nIT (all cleaners) and RIT (RB, ST). Although the chemical changes support a hydrolytic material deterioration, the results of mechanical properties may interfere with the material residual stresses during fabrication. Conclusions Caution should be exerted in the selection of aligner cleaners. The mild acidic cleanser was more aggressive to the polyester, whereas an alkaline peroxide to the polyester–urethane aligner.https://doi.org/10.1186/s40510-022-00449-wCleansersAlignersMechanical propertiesChemical alterations |
| spellingShingle | Anna Iliadi Vera Enzler Georgios Polychronis Timo Peltomaki Spiros Zinelis Theodore Eliades Εffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitro Progress in Orthodontics Cleansers Aligners Mechanical properties Chemical alterations |
| title | Εffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitro |
| title_full | Εffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitro |
| title_fullStr | Εffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitro |
| title_full_unstemmed | Εffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitro |
| title_short | Εffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitro |
| title_sort | εffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitro |
| topic | Cleansers Aligners Mechanical properties Chemical alterations |
| url | https://doi.org/10.1186/s40510-022-00449-w |
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