Effects of aging procedures on the molecular, biochemical, morphological, and mechanical properties of vacuum-formed retainers

Ahn, Hyo‐Won; Ha, Hye-Ryun; Lim, Hong Ngee; Choi, Samjin

doi:10.1016/j.jmbbm.2015.07.026

Cited by 36 publications

(32 citation statements)

References 25 publications

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“…Previous researchers demonstrated that long-term intraoral exposure accelerated changes in surface morphology, tensile strength, and elastic modulus of vacuum-formed retainer material (polyethylent-erephthalat-glycolmodified ethylen-1,4-cycloexylen dimethy-lenterephthalat copolymer). 17 In this study on the use of different cleaning methods, copolyester samples in all groups stored in Figure 5. A bar graph of copolyester light transmittance between baseline and 6 months (*P , .05).…”

Section: Discussionmentioning

confidence: 99%

Long-term effects of different cleaning methods on copolyester retainer properties

Wible

Agarwal

Altun

et al. 2018

The Angle Orthodontist

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Objective: To evaluate light transmittance, surface roughness, and flexural modulus of copolyester retainer material after long-term exposure to different cleaning methods. Materials and Methods: Standardized copolyester retainer specimens (ACE) were subjected to seven chemical cleaning solutions for 6 months: Invisalign cleaning crystals, Retainer Brite, Polident, Listerine mouthwash, 2.5% acetic acid, 0.6% NaClO, and 3% H 2 O 2 . Seventy specimens (n ¼ 10 per method, 50.8 mm 3 12.7 mm 3 1.0 mm) were exposed to the different solutions twice a week for 2 minutes or according to manufacturer's instructions and stored in artificial saliva at 378C. Another group of specimens (n ¼ 10) was brushed with a standardized toothbrushing machine for 2 minutes twice a week. At baseline and 6 months, light transmittance, surface roughness and flexural modulus of the specimens were quantified using spectrophotometry, profilometry, and three-point bend testing, respectively. Qualitative assessment was performed using scanning electron microscopy (SEM). Statistical analyses were accomplished at a significance level of .05. Results: The results indicated that light transmittance through the specimens decreased significantly from baseline for all cleaning methods at 6 months. Flexural modulus of the specimens decreased significantly for all cleaning methods except Invisalign crystals and Retainer Brite (P . .05). The Listerine group demonstrated the worst light transmittance change while H 2 O 2 demonstrated the greatest change in flexural modulus of the specimens compared with other cleaning methods; however, no qualitative difference was observed using SEM analysis. Conclusions:The results suggest that different cleaning methods affect long-term physical properties of the ACE retainer material. At the present time, none of these cleaning methods is ideal for copolyester retainer material. (Angle Orthod. 2019;89:221-227.)

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Section: Discussionmentioning

confidence: 99%

Long-term effects of different cleaning methods on copolyester retainer properties

Wible

Agarwal

Altun

et al. 2018

The Angle Orthodontist

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“…8 Various thermoplastic materials are currently used for fabrication, 9 including polyvinyl chloride, 10 polyurethane (PU), 11 polyethylene terephthalate (PET), 12 and polyethylene terephthalate glycol (PETG). 10, 12 Many studies have been conducted on clear aligners, particularly focusing on the mechanical properties of the aligners 13, 14, 15 or the biomechanics of tooth movement during orthodontic treatment. 12, 16 Researchers have also investigated new clear aligner materials to obtain desirable mechanical properties for orthodontic treatment.…”

Section: Introductionmentioning

confidence: 99%

Colour stabilities of three types of orthodontic clear aligners exposed to staining agents

et al. 2016

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The aim of this study was to evaluate and compare the colour stabilities of three types of orthodontic clear aligners exposed to staining agents in vitro. Sixty clear orthodontic aligners produced by three manufacturers (Invisalign, Angelalign, and Smartee) were immersed in three staining solutions (coffee, black tea, and red wine) and one control solution (distilled water). After 12-h and 7-day immersions, the aligners were washed in an ultrasonic cleaner and measured with a colourimeter. The colour changes (ΔE*) were calculated on the basis of the Commission Internationale de I'Eclairage L*a*b* colour system (CIE L*a*b*), and the results were then converted into National Bureau of Standards (NBS) units. Fourier transformation infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) were conducted to observe the molecular and morphologic alterations to the aligner surfaces, respectively. The three types of aligners exhibited slight colour changes after 12 h of staining, with the exception of the Invisalign aligners stained with coffee. The Invisalign aligners exhibited significantly higher ΔE* values (ranging from 0.30 to 27.81) than those of the Angelalign and Smartee aligners (ΔE* values ranging from 0.33 to 1.89 and 0.32 to 1.61, respectively, P<0.05). FT-IR analysis confirmed that the polymer-based structure of aligners did not exhibit significant chemical differences before and after the immersions. The SEM results revealed different surface alterations to the three types of aligner materials after the 7-day staining. The three types of aesthetic orthodontic appliances exhibited colour stability after the 12-h immersion, with the exception of the Invisalign aligners stained by coffee. The Invisalign aligners were more prone than the Angelalign and Smartee aligners to pigmentation. Aligner materials may be improved by considering aesthetic colour stability properties.

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“…Such rapid, nondestructive, label‐free analysis has been used effectively in real‐time monitoring of subtle cellular changes. We previously investigated microstructural and biochemical changes in tissues from in vivo and in vitro human and animal studies detected by Raman spectroscopy (Ahn et al, ; Choi et al, ; Jung et al, ; Kim et al, ; Lee et al, ; Shin et al, ). Our results showed that distinctive Raman peaks were observed in different treatment methods and tissues and could be used as biomarkers to detect abnormalities.…”

Section: Discussionmentioning

confidence: 99%

Label-free optical detection of age-related and diabetic oxidative damage in human aqueous humors

Moon

Kim

Choi

et al. 2016

Microsc. Res. Tech.

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In this study, we investigate the biochemical characteristics of oxidative stress in age-related macular degeneration (AMD) and diabetic retinopathy (DR) by analyzing aqueous humors. Nondiabetic cataract aqueous humor was used as the control. The level of oxidative damage was evaluated based on changes in Raman spectral intensity. Seven prominent peaks were detected at 1002, 1043, 1062, 1352, 1419, 1454, and 1656 cm . We proposed four multimodal biomarkers to distinguish these peaks based on the ratios of Raman intensities in two wavelengths, including CHO (C-O stretching or C-O-H bending modes), AG (adenine and guanine), PRO-AG (protein and AG), and PHEα (phenylalanine symmetric ring breath and amide I α-helix) markers. The presence of oxidative damage was detected by CHO and AG markers associated with C-O stretching, C-O-H bending modes in carbohydrates (1043 cm ), and the nucleic acids adenine and guanine (1352 cm ), respectively. DR-related oxidative damage was identified by PRO-AG and PHEα markers associated with adenine, guanine, and protein components (1419 and 1454 cm ) and amide I α-helix protein structure (1656 cm ), respectively. AMD-related oxidative damage was identified by four biomarkers. Four multimodal biomarkers with simple linear threshold values achieved high sensitivity of 100% and high specificity of 100% for classifying oxidative stress-induced AMD and DR diseases. Therefore, Raman-based label-free optical detection is effective for detecting the presence of age-related or diabetic oxidative damage in aqueous humor.

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Effects of aging procedures on the molecular, biochemical, morphological, and mechanical properties of vacuum-formed retainers

Cited by 36 publications

References 25 publications

Long-term effects of different cleaning methods on copolyester retainer properties

Long-term effects of different cleaning methods on copolyester retainer properties

Colour stabilities of three types of orthodontic clear aligners exposed to staining agents

Label-free optical detection of age-related and diabetic oxidative damage in human aqueous humors

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