ArticleOrthodontics & craniofacial research2025
The Mechanical Properties of Orthodontic Aligners of Clear Aligner After Intraoral Use in Different Time Periods.
Article in Orthodontics & craniofacial research, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
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Who cites it
8 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Ageing effects on chemical, physical, mechanical, and morphological properties of clear aligners - a systematic review.Progress in orthodontics · 2026Pooled it
- Comparative evaluation of physicochemical, mechanical, and biological properties of biodegradable poly(lactic acid) (PLA) and commercial aligner materials.Dental materials : official publication of the Academy of Dental Materials · 2026Article
- Static and Dynamic Mechanical Properties of 3D-Printable Aligner Resins: An In Vitro Study with FTIR Chemical Characterization.Journal of functional biomaterials · 2026Article
- Orthodontic Need Among Adult Patients Seeking Oral Rehabilitation in Craiova.Journal of clinical medicine · 2026Article
- Effects of cleaning methods on the removal efficacy of Streptococcus mutans biofilm and material properties of thermoplastic aligner materials.BMC oral health · 2026Article
- Evaluating chemical and surface stability of thermoformed and 3D-printed clear aligners after intraoral exposure.PloS one · 2026Article
- Bruxism Simulation in Aligner Therapy: Effects on Restored Posterior Teeth.Journal of clinical medicine · 2025Article
- Effect of elevated beverage temperatures on the physical and mechanical properties of invisalign clear aligners: an in-vitro simulation study.The Saudi dental journal · 2025Article
Corrections and comments
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Authors and funding
8 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveAlthough the technique of orthodontic aligners has risen in popularity, their mechanical properties have not been thoroughly investigated. The aim of this study was to evaluate the mechanical properties of the orthodontic aligners Clear Aligner after intraoral use for 7, 10 and 14 days, and to compare them with as-received aligners (0 days). It was also sought to examine the properties of the unprocessed raw material (polyethylene glycol terephthalate) used to manufacture these aligners. MATERIALS/
methodsThirty-two aligners by four patients were evaluated and studied at 0, 7, 10, 14 days of use. Each aligner was divided into three segments (two posterior and one anterior), which resulted in 96 samples. Also, 16 samples of unprocessed material were studied. For all samples, elastic modulus, ultimate tensile stress (UTS) and yield stress were calculated by conducting tensile testing. Additionally, material hardness was tested. The two-tailed Mann-Whitney test was performed, having set the level of significance at p = 0.05.
resultsAnalysis of the measurements indicated a statistically significant decrease in elastic modulus between days 0 and 14 of use, of UTS between days 0 and 7, 7 and 10, and of yield stress between days 0 and 7. For hardness, in every period, posterior segments demonstrated significantly higher values than anterior segments. All properties of the unprocessed material were statistically significantly higher than the processed samples.
conclusionsThe unprocessed material presented significant differences in every property tested in comparison to the processed aligners. The processed material showed further deterioration over time during use. The present study provides evidence that thermoforming and ageing affect the mechanical properties of the aligners.
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