The aim of this clinical and confocal laser scanning microscopic study was to compare the effects of two frequently used archwires on tooth movement and root resorption. A total of 84 premolars in 27 individuals (10 boys, 17 girls, with a mean age of 12.5 years) was moved buccally with an experimental fixed orthodontic appliance. In a split mouth experimental design the premolar on one side was...

Objective: To investigate the surface topography and ultimate tensile strength of 3 types nickel–titanium (NiTi) wires before after months intraoral use to assess efficiency in cases requiring extensive alignment. Methods: NiTi 0.016″ (0.40 mm) were divided into groups—martensitic stabilized NiTi™ (group 1), austenitic active Copper 27°C 2), martensitic copper 35°C 3)—each further 2 subgroups: ...

NiTi alloys used for orthodontic applications need to show superelastic characteristics at room and oral temperatures. The ideal scenario is that where the material has a final austenitic phase transformation value below the room temperature. This study aims at understanding the influence of the ageing treatments in the austenitic structure at room temperature on a wire of a Ni-rich NiTi alloy ...

NiTi wires were functionalized with silane coupling agents to improve interfacial adhesion between the inorganic constituent and a host matrix for composite applications. Surface derivatization was characterized by X-ray Photoelectron Spectroscopy, and mechanical pullout tests were performed to quantify the increase in adhesion between the NiTi shape memory alloy wires and polymer matrix. Impro...

AIM Oral environment of the mouth is a suitable place for biodegradation of alloys used in orthodontic wires. The toxicity of these alloys namely nickel and chromium has concerned the researchers about the release of these ions from orthodontic wires and brackets. The aim of this study was to measure the levels of nickel and chromium ions released from 0.018" stainless steel (SS) and NiTi wires...

The work presents a thermomechanical model for polycrystalline NiTi-based shape memory alloys developed within the framework of generalized standard solids, which is able to cover loading-mode dependent localization martensitic transformation. key point introduction novel austenite–martensite interaction term responsible strain-softening material. Mathematical properties are analyzed, and suita...

Nickel-Titanium (NiTi) based shape memory alloy (SMA) wires are already often used in industrial actuator applications. Their high energy density allows to build light-weight systems with forces using small installation spaces. Combined the biocompatibility of NiTi, a huge field applications can be covered by SMA actuated systems. In like emergency brakes or switch disconnectors, which require ...

Laser microwelding was used to join, for the first time, superelastic NiTi biomedical PtIr which can be in multicomponent devices. By process optimization, it possible control formation of B2 NiTiPt phase, with no intermetallic compounds being formed. The phase inside fusion zone had a strong metallurgical bonding base material due smooth transition its grain orientation towards ?111? NiTi. maj...