Residual Force of Orthodontic Elastomeric Ligature

Dechkunakorn, Surachai; Viriyakosol, Nuttachai; Anuwongnukroh, Niwat; Suddhasthira, Theeralaksna; Laokijcharoen, Pasaree; Churnjitapirom, Pornkiat; Tua-Ngam, Peerapong; Kaewprakob, Thongsak

doi:10.4028/www.scientific.net/amr.378-379.674

Cited by 4 publications

(8 citation statements)

References 18 publications

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“…It is evident that the relaxation time of polymeric orthodontic ligature ties used in this study was shorter than 24 h, at which the delivery force had already dropped by between 11.0 and 47.6% following uniform stretching. This range of reduction percentage overlapped with previous studies in which the delivery force reduction ranging between 30 and 50% were reported after applying constant uniform stretching or tension [ 21 , 22 ]. However, mouthwash rinsing seemed to be less influential on the level of delivery force after uniform stretching.…”

Section: Discussionsupporting

confidence: 88%

“…These findings imply that the sample geometry and/or materials have also influenced the delivery forces of polymeric orthodontic ligature ties. However, it should also be pointed out that there are a wide range of commercially available polymeric orthodontic ligature ties with various reported delivery forces, ranging between 0.7 and 5.3 N [ 21 , 22 ].…”

Section: Discussionmentioning

confidence: 99%

“…Changes in the delivery forces of ligature ties would alter the tooth movement and orthodontic treatment efficacy, and these changes were dependent on material, ligation method, and also the oral condition [ 1 , 2 , 3 ]. Previous studies have reported that the delivery forces of polymeric orthodontic ligature ties reduced dramatically following the first 24 h of their usage due to their viscoelastic properties [ 1 , 21 , 22 ]. However, it has not been thoroughly investigated whether mouthwashes also have any further influential effects on these properties or not.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Mouthwash Rinsing on the Mechanical Properties of Polymeric Ligature Ties Used for Dental Applications

et al. 2021

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Mouthwashes are used during dental treatments to mitigate the complications caused by poor oral hygiene. However, these solutions also affect the properties of dental appliances, including those used in orthodontics. This point has been investigated in this study focusing on the changes in mechanical properties of polymeric orthodontic ligature ties. Commercial ties from four brands were characterized in terms of their maximum forces and displacement, delivery forces, molecular structures, and microscopic morphology. These properties were compared against the ties, which were rinsed with commercial mouthwashes from three manufacturers. The results showed that mouthwash rinsing significantly reduced the maximum bearable forces of ligature ties by up to 73.1%, whereas the reduction in their maximum displacement was up to 74.5% across all tested brands. Significant changes in microscopic morphology of ligature ties were observed after mouthwash rinsing, but not their molecular structure. Furthermore, mouthwash rinsing also reduced the delivery forces from ligature ties by between 20.9 and 32.9% at their first deformation cycle. It can be concluded from this study that mouthwashes have significant impact on the mechanical properties of polymeric orthodontic ligature ties and could also potentially affect the overall efficacy of orthodontic and other dental treatments.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Mouthwash Rinsing on the Mechanical Properties of Polymeric Ligature Ties Used for Dental Applications

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“…Another advantage of the present study in comparison to some previous studies 13 , 18 , 20 was selection of the 0−8-week interval. Sims et al 21 stated that a single elastic module produces a ligation force of 50−150 g. Therefore, the results of the present study showed that the residual forces in all the tested groups after 8 weeks (142 ± 23 g and 149 ± 11 g in OT and AO elastomers, respectively) were adequate to hold the wire within the bracket slot and make it possible to arrange inter-appointment intervals longer than four weeks during the early stages of orthodontic treatment (in cases where there is no concern regarding plaque accumulation), which makes the treatment process more cost-effective for both the patient and the clinician.…”

Section: Discussionmentioning

confidence: 98%

Discoloration and force degradation of orthodontic elastomeric ligatures

Nakhaei

Agahi

Rezaeizadeh

2017

Dental Press J. Orthod.

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OBJECTIVE: The aim of the present study was to evaluate color changes and force degradation of orthodontic elastomeric ligatures in different stretching patterns during a 8-weeks period. METHODS: Two elastomers with the minimum and two with the maximum color changing, and gray elastomers of two brands (American Orthodontics and Ortho Technology) were selected according to an opinion poll with clinicians and color changes after 4 weeks of intraoral use were evaluated. These elastomers were mounted on special jigs fabricated using a CAD-CAM technique, underwent different stretching patterns and the force was measured in 0, 24 hours, 2, 4 and 8 weeks. During in vivo part of the study, force levels of elastomers were measured after 4 weeks on a material testing machine. Data were analyzed with four-way ANOVA and Tukey post hoc tests.RESULTS: All the elastomers showed color changing but the degree of color stability was significantly different. The mean force degradation was higher in 1-mm stretch groups. After 8 weeks, the average residual force of elastomers was 1.45 ± 0.18 N and the maximum force decay was seen in the elastomers that exhibited the maximum initial force.CONCLUSION: There is significant relationship between the stretching pattern and the amount of residual force of elastomers. Elastomers with higher initial forces exhibited higher percentages of force loss after 8 weeks. It seems that there is a relationship between initial color and color changing of elastomers.

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“…The manufacturer is responsible for ensuring that their products are safe to be used and the required tests should be performed. The direct use of cell and colony counting as an assay endpoint is commonly used but it is probably the least reliable method [3]. Dechkunakorn et al (2012) and Anuwongnukroh et al (2013) [3,4] …”

Section: Introductionmentioning

confidence: 99%

Cytotoxicity of three commercial orthodontic elastomeric ligature brands

et al. 2017

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Abstract.Objective: This study aimed to evaluate cytotoxicity of three commercial brands of orthodontic elastomeric ligatures. Materials and Methods: The three commercial orthodontic elastomeric ligature brands were C-brand, T-brand and U-brand from different manufacturing countries. The cytotoxic assay was performed using cell cultures (L929) which were subjected to the cell viability test with methyl-tetrazolium (MTT). The L929 cell line was grown in 96-well tissue culture plates (1x10 5 cells/cm 3 ). Elastomeric ligatures (0.2 g) from each brand was placed in 1 ml of Minimum Essential Medium (MEM) at 37°C with 5% CO2 at 100% humidity in an incubator for 24 hours. After incubation, the cell mitochondrial activity was evaluated by the MTT test for detecting viable cells from optical density according to ISO 10993-5: 2009 (E) test procedure. Cytotoxic effects were determined by the percentage of cell viability. Results: Microscopic investigation showed that all commercial elastomeric ligatures caused alterations in the fibroblast cell morphology from an elongated to a spherical form. The cell viability of C-brand, T-brand and U-brand were 51.10, 73.04 and 93.04%, respectively. Conclusion: T-brand and U-brand orthodontic elastomeric ligatures were non cytotoxic potential. U-brand had the greatest cell viability and C-brand had the lowest cell viability at 24 hours.

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Residual Force of Orthodontic Elastomeric Ligature

Cited by 4 publications

References 18 publications

Influence of Mouthwash Rinsing on the Mechanical Properties of Polymeric Ligature Ties Used for Dental Applications

Influence of Mouthwash Rinsing on the Mechanical Properties of Polymeric Ligature Ties Used for Dental Applications

Discoloration and force degradation of orthodontic elastomeric ligatures

Cytotoxicity of three commercial orthodontic elastomeric ligature brands

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