The Release of Ions from the Base Co-Cr-Mo Casting Alloy in vitro into the Phosphate Buffer at pH 6.0

Svrha rada bila je ispitati ponašanje WIRONIT® slitine u fosfatnom puferu pH 6,0 (kako bi se simulirala ljudska slina) kroz dulje razdoblje, te ustanoviti vrstu i količinu iona koji se otpuštaju iz slitine. Također se je željelo ustanoviti kako na otpuštanje iona utječe vrijeme izloženosti slitine djelovanju fosfatnoga pufera pH 6,0. U tu svrhu ispitano je 60 neobrađenih tvorničkih uzoraka WIRONIT® slitine promjera 8 mm i visine 15,8 mm. Otpuštanje iona mjereno je u deset razdoblja: 1, 2, 3, 4, 5, 6, 7, 14, 21 i 30 dana. Raščlambom otopina u kojima su bili uzorci ispitivane slitine s pomoću atomskoga emisijskog spektrofotometra s induciranom združenom plazmom (ICP-AES) utvrđeno je da su se u mjesec dana otpustili ioni kobalta (Co), kroma (Cr), željeza (Fe), cinka (Zn) i nikla (Ni). Iz uzoraka bazne Co-Cr-Mo slitine najviše se otpustilo iona kobalta, a najmanje iona željeza. Rezultati su pokazali da na otpuštanje svih pronađenih iona statistički znatno utječe vrijeme ekspozicije slitine fosfatnom puferu pH 6,0 (p<0,01).The purpose of this study was to examine how WIRONIT® alloy behaves in phosphate buffer at pH 6.0 (which simulate human saliva) over a relatively long period of time and to establish the type and amount of ions released from the casting alloy. The study also attempted to determine the influence of the time period, during which the casting alloy was exposed to the phosphate buffer at pH 6.0. and 15.8 height) were tested. Release of ions was measured on ten occasions: 1, 2, 3, 4, 5, 6, 7, 14, 21 and 30 days. An analysis of the solution into which samples of the tested alloy were plunged using inductively coupled plasma atomic emission spectrometer (ICP-AES) showed that cobalt (Co), chromium (Cr), iron (Fe), zinc (Zn) and nickel (Ni) ions were released during the month. Co ions were released from the base Co-Cr-Mo alloy in the greatest amount while Fe ions were released in the smallest amount. The results of this study indicate that the time of exposure to the phosphate buffer at pH 6.0 had statistically significant influence (p