An experimental evaluation of effects and side effects of asymmetric face-bows in the light of in vivo measurements of initial tooth movements

Yoshida, Noriaki; Jost-Brinkman, Paul-Georg; Miethke, Rainer‐Reginald; König, Matthias; Yamada, Yoshiaki

doi:10.1016/s0889-5406(98)70267-7

Cited by 16 publications

(14 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This has been found in other studies 5,29,30 and can result in a posterior cross-bite on the side receiving more distal force. According to Yoshida et al, 29 the lateral dislocation is directly proportional to the asymmetry existing in the outer arch. That is, the more asymmetric the outer bow, the greater the buccopalatal movement of the distalized molars.…”

Section: Discussionsupporting

confidence: 74%

Asymmetric headgear for differential molar movement: a study using finite element analysis

Squeff

Ruellas²,

Penedo

et al. 2009

Journal of Orthodontics

View full text Add to dashboard Cite

show abstract

Section: Discussionsupporting

confidence: 74%

Asymmetric headgear for differential molar movement: a study using finite element analysis

Squeff

Ruellas²,

Penedo

et al. 2009

Journal of Orthodontics

View full text Add to dashboard Cite

show abstract

“…In this regard, blending is usually considered as an economical and practical way of improving heat resistance and mechanical properties of polymers and of controlling their (bio)degradation. Therefore, PLAs were blended with various biodegradable and non‐biodegradable polymers such as poly( ϵ ‐caprolactone), poly(ethylene oxide‐ b ‐amide‐12), poly(butylene succinate), poly(butylene adipate‐ co ‐terephthalate), poly(ether‐urethane), poly(ethylene terephthalate), poly(3‐hydroxybutyrate‐ co ‐4‐hydroxybutyrate), poly(vinyl acetate), poly(glycolic acid), hyperbranched polymers and rubbers . Amongst all, poly(methyl methacrylate) (PMMA) has been claimed as a promising partner for PLA due to its good physical and chemical properties such as high glass transition temperature, high transparency and long‐term stability …”

Section: Introductionmentioning

confidence: 99%

Hydrolytic degradation of poly(l‐lactic acid)/poly(methyl methacrylate) blends

Boudaoud

Benali

Mincheva

et al. 2018

Polymer International

View full text Add to dashboard Cite

The hydrolytic degradation of poly(L-lactic acid)/poly(methyl methacrylate) (PLLA/PMMA) blends was carried out by the immersion of thin films in buffer solutions (pH = 7.24) in a shaking water bath at 60 ∘ C for 38 days. The PLA/PMMA blends (0/100; 30/70; 50/50; 70/30; 100/0) were obtained by melt blending using a Brabender internal mixer and shaped into thin films of about 150 m in thickness. Considering that PMMA does not undergo hydrolytic degradation, that of PLLA was followed via evolution of PLA molecular weight (recorded by size exclusion chromatography), thermal parameters (differential scanning calorimetry (DSC)) and morphology of the films (scanning transmission electron microscopy). The results reveal a completely different degradation pathway of the blends depending on the polymethacrylate/polyester weight ratio. DSC data suggest that, during hydrolysis at higher PMMA content, the polyester amorphous chains, more sensitive to water, are degraded before being able to crystallize, while at higher PLLA content, the crystallization is favoured leading to a sample more resistant to hydrolysis. In other words, and quite unexpectedly, increasing the content of water-sensitive PLLA in the PLLA/PMMA blends does not mean de facto faster hydrolytic degradation of the resulting materials.

show abstract

“…Furthermore, the interfacial tension between PLA and NBR in the blends can also be simply approximated from the surface free energy of PLA ( σ 1 ) and NBR ( σ 2 ) using Antonoff's rule in which the interfacial tension for the polymer blend ( σ 12 ) is the absolute value of the difference of their surface free energies ( σ 12 = | σ 1 − σ 2 |).…”

Section: Methodsmentioning

confidence: 99%

Effect of acrylonitrile content of acrylonitrile butadiene rubber on mechanical and thermal properties of dynamically vulcanized poly(lactic acid) blends

Samthong

Kunanusont

Deetuam

et al. 2019

Polymer International

View full text Add to dashboard Cite

We report here the morphology, thermal and tensile properties of poly(lactic acid) (PLA) blends composed of acrylonitrile butadiene rubber (NBR) with different acrylonitrile contents with/without dynamic vulcanization by dicumyl peroxide (DCP). The interfacial tension of PLA and NBR measured by contact angle measurement decreased as the acrylonitrile content of NBR decreased. Likewise, SEM images showed that the rubber particle size reduced with decreasing acrylonitrile content owing to the stronger interfacial adhesion between the PLA matrix and NBR domains. Incorporation of DCP at 1.0 phr for dynamic vulcanization led to higher crosslink density and, in turn, optimal tensile strength and tensile toughness as a result of the action of PLA-NBR copolymer as a reactive compatibilizer. The dynamic vulcanization of the blends containing low acrylonitrile NBR gave the most improved tensile properties because the free radicals from DCP decomposition preferentially attacked the allylic hydrogen atoms or double bonds of the butadiene backbone. Accordingly, more NBR macroradicals were generated and probably more PLA-NBR copolymers were produced. Moreover, further addition of DCP at 2.0 phr provided a large amount of crosslinked NBR gel, which significantly degraded the tensile properties. From the DSC results, dynamic vulcanization lowered the cold crystallization temperature, implying an improvement of cold crystallization. Finally, TGA results showed a higher degradation temperature as a function of DCP content, which suggested that thermal stability increased due to stronger interfacial adhesion as well as higher gel content.

show abstract

An experimental evaluation of effects and side effects of asymmetric face-bows in the light of in vivo measurements of initial tooth movements

Cited by 16 publications

References 12 publications

Asymmetric headgear for differential molar movement: a study using finite element analysis

Asymmetric headgear for differential molar movement: a study using finite element analysis

Hydrolytic degradation of poly(l‐lactic acid)/poly(methyl methacrylate) blends

Effect of acrylonitrile content of acrylonitrile butadiene rubber on mechanical and thermal properties of dynamically vulcanized poly(lactic acid) blends

Contact Info

Product

Resources

About