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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 ®

. L'analyse-Électrochimique-montre-d-­-rect-®-ecorr, 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

. Ecorr, . Tout-comme-icorr, ®. Pour-le-d-­-rect, . Le, and . De-mann, 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