Force Decay - an overview | ScienceDirect Topics
To this end, the repulsive force on surface approach has been characterised by its decay length, or more precisely the log linear (natural log) slope of the force at separations between 20 and 50 nm from contact. The decay length values have been presented in Fig. 9, as a function of pH, calcium concentration and NOM.
A systematic review of force decay in orthodontic elastomeric …
2012年9月1日 · Elastomeric chains are one of several devices used to provide force for orthodontic tooth movement, but the force they exert diminishes over time and can thus be difficult to control. The objective of this investigation was to provide a systematic review of publications pertinent to force decay in orthodontic elastomeric chains.
Weak interaction - Wikipedia
In nuclear physics and particle physics, the weak interaction, also called the weak force, is one of the four known fundamental interactions, with the others being electromagnetism, the strong interaction, and gravitation.
10.4: Radioactive Decay - Physics LibreTexts
When an individual nucleus transforms into another with the emission of radiation, the nucleus is said to decay. Radioactive decay occurs for all nuclei with \(Z > 82\), and also for some unstable isotopes with \(Z < 83\). The decay rate is proportional to the number of original (undecayed) nuclei N in a substance.
Force decay of elastomeric chains - a mechanical design and …
Objectives: To evaluate the percentage force decay of elastomeric chain products utilizing three different design mechanisms simulating canine retraction; and to evaluate the percentage force decay of elastomeric chain products from four different companies. Design: In …
Force Decay Behavior of Orthodontic Elastomeric Chains in
2024年9月22日 · Force decay was measured using a digital force gauge at the time of engagement on the jigs, at one hour, four hours, and at one, seven, 14, 21, and 28 days. Percentage force decay was calculated, and the results were subjected to one-way analysis of variance (ANOVA), post-hoc Tukey, post-hoc Bonferroni, and 't' test.
Idealized force decay of orthodontic elastomeric chains follows Nutting ...
2020年11月3日 · The force decay of orthodontic elastomeric modules has been of considerable interest since these biomechanical force-generating appliances were introduced five decades ago. Two mathematical approaches, a power-law equation and a Maxwell–Weichert model, have been used by previous investigators to predict the in vitro force degradation under ...
Force decay evaluation of latex and non-latex orthodontic …
2017年10月6日 · This clinical study was conducted in order to evaluate force decay over time of latex and non-latex orthodontic intraoral elastics. Methods: Patients (n = 15) were evaluated using latex and non-latex elastics in the periods of : 0, 1, 3, 12 and 24 hours.
Influence of pH levels and beverage exposure on force decay and …
2024年2月1日 · Force decay in polyurethane chains is an unavoidable side effect of their use. While there is some evidence that force decay is not influenced by pH value (Teixeira et al., 2008), some authors reported that acidic environments could be the reason for greater force loss (Khaleghi et al., 2021).
(PDF) A systematic review of force decay in orthodontic elastomeric ...
2012年8月17日 · A total of 53 studies were found to be relevant to force decay in elastomeric chains, including 22 on force decay over time, seven on the force consequences of pre-stretching, 12 on the...