Force degradation of orthodontic latex elastics analyzed in vivo and in vitro

Liu, Yang; Lv, Chenxing; Fan, Yan; Feng, Jianying

doi:10.1016/j.ajodo.2019.03.028

Cited by 13 publications

(15 citation statements)

References 12 publications

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“…When the OLE is immersed in the liquid for a long time, the latex absorbs much water, and the force value greatly decreases. OLE stretching can also decrease the force strength due to the breakage of latex secondary bonds that increases over time and results in primary bond rupture manifested as strength loss [18]. This phenomenon is in agreement with the result that the force value of OLE at 24 hours is the smallest among those for the other groups.…”

Section: Resultssupporting

confidence: 89%

Does mouthwash degrade the force of orthodontic latex elastics?

Suparwitri

Rosyida

Alhasyimi

2022

IJPHS

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With the surge of COVID-19 pandemic, orthodontists have recommended the use of mouthwashes. However, this product frequently contains ingredients that can modify the mouth's pH and elastic force. This study examined the influence of mouthwashes on latex elastic force deterioration. One hundred orthodontic latex elastics (1/4”) were separated into five groups: control, zinc sulfate 0.2%, chlorhexidine 0.2%, sodium fluoride 0.2%, and povidone–iodine 1%. The samples were stretched to 19.05 mm, stored in artificial saliva solutions, and incubated. Groups 2–5 tested mouthwashes for 60 seconds every 12 hours and then reverted to artificial saliva. Force was measured using a five-times-activated tension gauge. Elastic force was tested at five-time intervals: baseline, 1, 6, 12 and 24 hours. The statistical analysis included two-way ANOVA and the Tukey post–hoc test. Results showed statistical differences for the time intervals and force degradation of orthodontic latex elastics (p<0.05). The majority of force loss occurred within six hours of extension and immersion. Mouthwashes had no influence on the reduction in elastic force (p>0.05). The force degradation of orthodontic latex elastics was unaffected by mouthwashes. The lowest force degradation was generated by povidone–iodine, followed by zinc sulfate, sodium fluoride, and chlorhexidine.

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Section: Resultssupporting

confidence: 89%

Does mouthwash degrade the force of orthodontic latex elastics?

Suparwitri

Rosyida

Alhasyimi

2022

IJPHS

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“…Analyzing the existing literature about inter-arch elastics, many studies focused on testing inter-arch distances >20 mm, to simulate real clinical conditions (5,9,16,18,19). In previous works, force-extension curves were provided with distances arbitrarily set at 5-or 10-mm intervals from 0 to 60 mm.…”

Section: Discussionmentioning

confidence: 99%

“…The weakness of elastics is represented by their rapid deterioration and loss of elasticity into the oral environment (4,5). A review of the existing literature in the field showed that most of the studies examined the applied force of interarch elastics, at standard distances, and in a static environment (6,7).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Class II Intermaxillary Elastics Applied Forces: An in-vitro Study

et al. 2022

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ObjectivesThe aims of this study were: (1) to assess the average inter-arch distances characterizing Class II malocclusions, (2) to analyze the applied forces at those distances by different elastics, and (3) to compare measured forces with those declared by manufacturers, both in dry and wet environments.Materials and MethodsSettings and sample population: Class II models of 167 adult subjects (96 women and 71 men, age: 28 ± 3 years) referred to the Orthodontic Department of the University of Turin, Turin, Italy, between January 2018 and January 2020, were collected. Distances between facial axes (FA) points of upper canines and lower first molars (A), upper first premolar and lower first molar (B), upper second premolar and lower first molar (C), upper canine and lower first premolar (D), and upper canine and lower second premolar (E), were measured using 3Shape Ortho® Viewer program. Different elastics' diameters and forces were tested at those distances. The MTS Insight® Electromechanical Testing System was used to measure the tensile forces of elastics. The applied forces were measured in dry (T0) and wet conditions, after 1 (T1), 6 (T2), and 12 h (T3).ResultsAverage distances were calculated: A = 24.64 mm (SD 2.10), B = 16.3 mm (SD 1.94), C = 9.78 mm (SD 1.77), D = 9.8 mm (SD 1.88), and E = 15.99 mm (SD 2.06). Significant differences (p < 0.05) were highlighted between the measured force and the force declared by manufacturers, and all elastics had a significant force decay (p < 0.05).ConclusionThe results showed that 3/16" 4.5 oz are the most reliable elastics in terms of applied force with respect to the declared one and in terms of force degradation.

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“…At 4 and 8 hours, the force losses were near 35% and 40%. 29 Yang et al 30 concluded in his study that the force degradation of latex elastic in vivo is much greater than that in both air and artificial saliva. In vivo, the force value of the orthodontic latex elastics decreased sharply in the first hour.…”

Section: Discussionmentioning

confidence: 96%

Comparative evaluation of interrupted and intermittent forces on canine retraction: an in vivo study

Jagtap¹,

Bhosale²,

Patil³

2021

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Introduction: Various force systems are used in orthodontics to move teeth, such as continuous, intermittent and interrupted. Teeth responds differently to these orthodontic forces. Aims: The aim of the study is to compare the rate of canine retraction with intermittent and interrupted forces. Materials and Methods: A split mouth study was carried among eighteen participants. One side of maxillary arch randomly received interrupted force with elastomeric powerchain while other received intermittent force with elastics with magnitude of 150-170g for canine retraction on each side. For 15 weeks, participants were asked to wear the elastics 8 hours a day whereas the elastomeric powerchains were replaced by operator every 5 weeks. The outcomes were assessed using scanned images of study models collected at the beginning (T0) and 15 weeks later (T3) as well on OPG. Linear and angular measurements were used to measure the distal movement, rotation as well tipping of canines and the results were statistically analysed using Independent t-test. Results: The distal movement of canine on the interrupted force side was 0.98mm/5weeks and on the intermittent force side was 1.06mm/5weeks. The distopalatal rotation on interrupted and intermittent force side was 8.38° and 5.72°. Tipping measured on OPG was 5.72° and 5.27° for interrupted and intermittent force. No statistically significant differences were found. Conclusion: The rate of canine retraction with interrupted force and intermittent force showed no statistically significant differences. Less canine rotation and tipping with intermittent force compared to interrupted force though not statistically significant.

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Force degradation of orthodontic latex elastics analyzed in vivo and in vitro

Cited by 13 publications

References 12 publications

Does mouthwash degrade the force of orthodontic latex elastics?

Does mouthwash degrade the force of orthodontic latex elastics?

Analysis of Class II Intermaxillary Elastics Applied Forces: An in-vitro Study

Comparative evaluation of interrupted and intermittent forces on canine retraction: an in vivo study

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