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Ultima descărcare din IBN: 2024-04-10 16:18 |
SM ISO690:2012 AVORNIC-CIUMEICO, Lucia, TRIFAN, Valentina, CALFA, Sabina, CAZACU, Igor, CIUMEICO, Igor. Aliajele nichel-titan în ortodonție. Actualități, varietăți, utilizare. In: Congresul consacrat aniversării a 75-a de la fondarea Universității de Stat de Medicină şi Farmacie „Nicolae Testemiţanu”, 21-23 octombrie 2020, Chişinău. Chişinău: USMF, 2020, p. 692. |
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Congresul consacrat aniversării a 75-a de la fondarea Universității de Stat de Medicină şi Farmacie „Nicolae Testemiţanu” 2020 | ||||||
Congresul "Congresul consacrat aniversării a 75-a de la fondarea Universității de Stat de Medicină şi Farmacie „Nicolae Testemiţanu”" Chişinău, Moldova, 21-23 octombrie 2020 | ||||||
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Pag. 692-692 | ||||||
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Background. The success of the contemporary orthodontics depends on new techniques and biomaterials that are put in use. Nickel-titanium (Ni-Ti) alloys are part of the group of "smart" intermetallic materials, defined by 2 notions: with shape memory effect and superelastic. . The shape memory effect of an alloy was discovered in the 1930s. They have been used in orthodontic therapy since the early 1970s. Objective of the study. To evaluate the medico-technical qualities, varieties and use of the Ni-Ti alloys in orthodontics. Material and Methods. The study of the literature with reference to orthodontic metallic biomaterials, as well as the catalogues of the licensed manufacturing companies revealed that Ni-Ti alloys are of choice in making superelastic and with shape memory effect orthodontic wires, as well as springs, clips of some self-ligating brackets. Results. The Ni-Ti alloys possess properties dependent on the composition and the heat treatment regime. As a rule, they contain 55% Ni and 45% Ti. In 1994 the alloy CuNiTi 27°C appears, then CuNiTi 35-40°C. The Ni-Ti wires were classified according to the effect produced (similar to rubber, shape memory, superelastic) and the force produced (austenite, martensite, stabilized). They were used in all cases for the alignment and leveling of dental arches, producing continuous, "gentle" forces for tooth movement thanks to superelasticity and thermoactivity. The shape memory effect allows the deformed wires to return by heating - martensitic transformation (equal to that of the body). Conclusion. The Ni-Ti alloys have great clinical interest; they are found in orthodontic treatment in the form of wires used for the alignment and leveling of dental arches, springs for closing/opening interdental spaces, easily maneuverable clips in self-ligating brackets. |
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Cuvinte-cheie nickel titanium alloy, orthodontic wire, aliaj nichel-titan, arc ortodontic |
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