Do the NiTi low and constant force levels remain stablein vivo?

Abstract

For the purpose of a 4-6-week aligning stage, round NeoSentalloy® with a diameter of 0.016 inches seems to be the wire of choice because of the low level of F dav.

Do Mechanical and Physicochemical Properties of Orthodontic NiTi Wires Remain Stable In Vivo?

“…Presented research was aimed at identifying alterations in the structure of orthodontic wires after their 12-week acting in vivo. It brought the evidence that oral environment evidently affects NiTi wires changing their structure and thereby their properties, which is in accordance with the results obtained by other clinicians [8, 9, 11]. …”

“…Our results obtained in previous [11] and current studies allow answering both posted queries: the results of nanohardness significantly increased under influence of the oral environment ( p < 0.05), although in the uniform manner ( p > 0.05 for intragroup A comparison). Presence of permanently and diversely altered crystal structures within the same used wire is substantial.…”

“…Nonetheless our previous studies have already proved that those forces are likely to change with the function of time and are not always predictable [11]. Presented research was aimed at identifying alterations in the structure of orthodontic wires after their 12-week acting in vivo.…”

Comparative analysis of plastic deformation of NiTi and CuNiTi wires submitted to mechanical cycling

“…Within the range of archwires existent on the market, the NiTi type are those that release lighter forces when compared with the other archwires [4,9], and may be presented in the conventional superelastic [6,24,25] or thermoactivated [20,26,27] form, with 55% nickel and 45% titanium [28]. Whereas, the CuNiTi archwires that may also be classified as being thermoactivated (tensoactive) and superelastic, are basically composed of nickel, titanium and copper, on an average, presenting, 50%, 44% and 6%,respectively, of these chemical elements [2,4,29].…”

“…They can be used in cases of excessive crowding and in periodontally compromised patients [7]. Thus, by means of light continuous force, these archwires help with the movement of teeth in the most biological manner, avoiding the area of hyalinization, necrosis and loss of anchorage, diminishing the probability of root resorption [5,8,9].…”