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, Mots Clés : Orthodontie Corrosion Nickel--titane Acier multibrins
, REDON Nicolas -Résistance à la corrosion des fils Copper Ni--Ti 35 ® et des fils acier inoxydable multibrins D--rect ® en milieu acide
, Le but de cette étude est de comparer la résistance à la corrosion en pH acide de deux familles d'arcs utilisés dans les premières phases d'un traitement d'orthodontie
, Dix arcs en acier multi--brins (D--rect ® ) et dix arcs en alliage de nickel--titane -cuivre (Copper Ni--Ti, vol.35
, Dix arcs de chaque type sont immergés durant une heure dans une salive artificielle, acidifiée par adjonction d'acide citrique (pH = 2,52)
, L'analyse de la composition des fils révèle que le fil de D--rect ® est composé, en pourcentage massique, de fer (62,36 %), chrome (17,01 %) et nickel (7,80%), alors que le fil Copper Ni--Ti 35 ®
250 ± 70 mV D--rect ® Icorr ? 13 ± 2 x10 --6 mA Copper Ni--Ti 35 ® Ecorr ? --385 ± 170 mV Copper Ni--Ti 35 ® Icorr ? 2,4 ± 0, vol.5, pp.10-16 ,
Whitney met en évidence une différence très significative pour Ecorr et Icorr (p<0,001) entre les deux groupes. Les fils en acier inoxydable multibrins présentent donc un comportement plus noble face à la corrosion que les fils en alliage de nickel--titane--cuivre, mais une fois le processus de corrosion initié, celui--ci se ralentit pour le fil en alliage nickel--titane--cuivre en raison d'un phénomène de passivation ,