Effect of oral exposure on chemical, physical, mechanical, and morphologic properties of clear orthodontic aligners

Lira, Larine Ferreira; Vargas, Eduardo Otero Amaral; Silva, Eduardo Moreira da; Maia, Juliana Nunes da Silva Meirelles Dória; Elzubair, Amal; Morais, Liliane Siqueira de; Jr, Sérgio Alvaro de Souza Camargo; Serra, Glaucio; Souza, Margareth Maria Gomes de

doi:10.1016/j.ajodo.2023.05.015

Cited by 5 publications

(3 citation statements)

References 42 publications

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“…In our opinion, increased surface roughness, combined with a lack of proper oral hygiene, may have detrimental effects on plaque retention and the absorption of water, saliva, and other fluids, leading to discoloration of clear aligners during intraoral use [ 21 , 22 ].…”

Section: Discussionmentioning

confidence: 99%

“…In fact, the thermal shock associated with the thermoforming process could alter the surface roughness and thus partially affect the optical and absorption properties of the material [ 20 , 21 ]. Lira et al found an increase in surface roughness after 14 days of intraoral use, resulting in a loss of transparency and increased pigmentation of the aligners [ 22 ]. However, no study has yet investigated the effects of thermoforming on surface roughness [ 21 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Thermoforming on the Mechanical, Optical, Chemical, and Morphological Properties of PET-G: In Vitro Study

Staderini,

Chiusolo,

Guglielmi

et al. 2024

Polymers

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The effectiveness of clear aligners in correcting malocclusions is closely linked to the properties of the materials used to make them. The polymers used in the manufacture of clear aligners have well-established properties. However, the process of manufacturing clear aligners, known as thermoforming, involves thermal and mechanical shocks that may alter these properties. The objective of this study was to evaluate the effects of thermoforming on the mechanical, optical, chemical, and morphological properties of sixty PET-G specimens. The study compared the thickness, weight, absorbance, chemical structure, surface roughness, elastic modulus, yield strength, and breaking load of thirty thermoformed specimens with thirty non-thermoformed specimens. The study introduces a new approach by using standardized samples to analyze both chemical and physical properties. The results showed statistically significant differences in thickness (−15%), weight (−11%), and surface roughness (+1233% in roughness average; +1129% in RMS roughness) of the material. Additionally, a correlation was found between reduction in thickness and increase in opalescence. There was no significant change in the functionality of the aligners after thermoforming, as no significant mechanical changes were found. However, the increase in surface roughness may lead to plaque and fluid accumulation and worsen the fit of the aligners.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Thermoforming on the Mechanical, Optical, Chemical, and Morphological Properties of PET-G: In Vitro Study

Staderini,

Chiusolo,

Guglielmi

et al. 2024

Polymers

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show abstract

“…These results may be related to the higher a nity of the thermoplastic PU material toward pigment accumulation owing to its biphasic microstructure [28]. In a recent study analyzing the effects of oral exposure on OA properties, Lira et al [29] reported changes in color and surface roughness.…”

mentioning

confidence: 99%

Influence of diet on change in color and roughness of orthodontic aligners: A longitudinal study

Bocato,

Berger,

Fernandes

et al. 2024

Preprint

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Objectives The present study aimed to evaluate the influence of diet on color change and roughness of orthodontic aligners (OAs) during the initial 6 months of treatment. Materials and Methods Twenty patients treated with orthodontic aligners (OAs) (Invisalign Align Technology Santa Clara, California, USA) who met the following criteria were included in the study: between 13 and 35 years of age, both sexes, Angle Class I malocclusion, moderate lower anterior crowding, and non-extraction treatment. The exchange of pairs of upper and lower aligners was performed every 10 days. To assess the color stability and roughness of the aligners, the buccal surface of the tooth 11 was cut and analyzed in a series of 12 non-consecutive aligners used by 20 patients for 10 days (n = 20), over the initial 6 months of treatment. To verify the change in color and roughness, the Friedman test was used. The correlation between variables was assessed using Spearman's correlation coefficient, with a significance level of 5%. Results When the correlation between dietary issues and changes in color and roughness was verified, it was found that patients who ate acidic foods, such as coffee, wine, soda and juice, showed greater color changes (p < 0.05) and roughness in the OA (p < 0.05). Intake of acidic fruits showed a significant correlation only with color change at months 3, 4 and 5. Conclusion The acidic and pigment-rich diet contributed to the change in color and increase roughness of the orthodontic aligners. Clinical Significance It is recommended that patients remove the OA for their meals, in order to maintain the aesthetic characteristics of the appliances and an efficient standard of hygiene.

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Binder-Free TiO2-Cu composite powder coating for thermoformable orthodontic clear aligners

Ha,

Oh,

Kim

2024

Chemical Engineering Journal

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Effect of oral exposure on chemical, physical, mechanical, and morphologic properties of clear orthodontic aligners

Cited by 5 publications

References 42 publications

Effects of Thermoforming on the Mechanical, Optical, Chemical, and Morphological Properties of PET-G: In Vitro Study

Effects of Thermoforming on the Mechanical, Optical, Chemical, and Morphological Properties of PET-G: In Vitro Study

Influence of diet on change in color and roughness of orthodontic aligners: A longitudinal study

Binder-Free TiO2-Cu composite powder coating for thermoformable orthodontic clear aligners

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