Propriedades mecânicas de implantes dentários submetidos à ação de íons fluoretos
Mechanical properties of dental implants submitted to fluoride ions action
Sartori, R.; Corrêa, C.B.; Fernandes Filho, R.B.; Marcantonio Jr., E.; Vaz, L.G.
Rev. odontol. UNESP, vol.36, n4, p.317-322, 2007
Resumo
O objetivo deste estudo foi avaliar a dureza, a resistência à fadiga e a fractografia do conjunto implante-componente de titânio comercialmente puro (Ti c.p.) após ser submetido à corrosão por íons fluoretos. Espécimes de duas marcas comerciais, uma nacional (Neodent) e outra importada (3i Implant Innovations), foram analisados; cada uma com dois grupos de 7. Os conjuntos do grupo teste foram imersos em solução de fluoreto de sódio a 1500 ppm (pH 5,3) por 184 horas, simulando 5 anos de exposição ao flúor, e os do grupo controle, em água destilada pelo mesmo tempo. A dureza dos implantes foi avaliada antes e após a exposição aos íons fluoretos, demonstrando redução estatisticamente significante. Todos os conjuntos suportaram a ciclagem mecânica (105 ciclos, 15 Hz, 150 N), realizada após a imersão nas soluções. A fractografia, por meio de microscopia eletrônica de varredura, não relevou presença de trincas ou fendas nos implantes. Concluiu-se que o fluoreto de sódio a 1500 ppm influenciou apenas na superfície dos biomateriais estudados, sem comprometer a resistência mecânica do conjunto implante-componente.
Palavras-chave
Implantes dentários, titânio, corrosão, teste de dureza, fadiga
Abstract
The aim of the study was to assess the hardness, the fatigue resistance and the fractography of commercially pure titanium (c.p. Ti) implant-abutment set submitted to 3 corrosion by fluoride ions. Fourteen samples of two trademarks, a nacional one (Neodent) and an internacional one (3i Implant Innovations), divided into two groups with 7 samples each, have been analyzed. The sets of test group were submerged in a 1500 ppm sodium fluoride solution (pH 5.3) for 184 hours, simulating 5 years of fluoride contact, and the control groups sets in distilled water for the same time. The implants hardness was assessed before and after the contact to fluoride ions, showing reduction statically different. All groups supported the mechanical cycling (105 cycles, 15 Hz, 150 N) after solution immersion. The fractography, by scanning electronic microscopy, didn’t show the presence of cracks and gaps in the implants. In conclusion, the sodium fluoride at 1500 ppm influenced the evaluated biomaterials surface, without impairment of mechanical properties of de implant-abutment set.
Keywords
Dental implants, titanium, corrosion, hardness, fatigue
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