20.500.12556/DKUM-85006 Korozija kovinskih implantatov v umetni slini s simulacijo dodatka želodčne kisline diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje Corrosion of metal implants in artificial saliva simulated by gastric acid V diplomskem delu smo preučevali korozijsko hitrost titanove zlitine TI90Al6V4 in nerjavnega jekla AISI 316L, ki se najpogosteje uporabljata kot implantata v dentalni medicini. Vzorca smo proučevali v čisti umetni slini, ki je služila kot osnovna raztopina. Čisti umetni slini smo nato dodajali še klorovodikovo kislino, ki v želodcu ohranja kisel pH, a lahko hkrati povzroča težave, t.i. zgago. Klorovodikovo kislino smo dodajali, da smo dobili pH vrednosti, ki so segale od pH = 2, ki je najnižja pH vrednost želodčne kisline pa vse do pH vrednosti ustnega plaka. Proučevali smo tudi kako na korozijo vplivata vodikov peroksid in mlečna kislina, ki pa se v telesu tvorita kot produkt, ki ga v primeru vnetja v ustni votlini tvorijo mikroorganizmi. Uporabili smo vodikov peroksid različnih koncentracij in mu dodajali mlečno kislino. Vzorce smo termostatirali pri 37°C in jih potopili v raztopine za 24, 48, 72 in 96 ur kjer so se pasivirali. Uporabljena metoda za določanje rezultatov je bila gravimetrična metoda. Na podlagi rezultatov, ki smo jih dobili z gravimetrično metodo smo izračunali korozijske hitrosti. Rezultati so pokazali, da je titanova zlitina korozijsko odpornejša v umetni slini ob dodatku klorovodikove kisline do pH = 2, medtem ko je v ostalih medijih korozijsko odpornejše nerjavno jeklo. Izračunane korozijske hitrosti so še vedno relativno majhne, zato smo potrdili, da sta tako titanova zlitina kot nerjavno jeklo primerna za uporabo kot dentalna implantata. In the thesis we studied the corrosion rate of titanium alloy TI90Al6V4 and stainless steel AISI 316L, which are most commonly used as implants in dentistry. The samples were studied in pure artificial saliva, which served as a basic solution. Pure artificial saliva was then supplemented with hydrochloric acid, which maintains an acidic pH in the stomach, but can also cause problems such as heartburn. The hydrochloric acid was added to obtain pH values ranging from pH = 2, which is the lowest pH value of stomach acid, to the pH value of oral plaque. We also studied how hydrogen peroxide and lactic acid, which are formed in the body as a product of micro-organisms in the oral cavity in the event of inflammation, affect corrosion. We used hydrogen peroxide in different concentrations and added lactic acid. The samples were thermostated at 37°C and immersed in the solutions for 24, 48, 72 and 96 hours to passivate. The method used to determine the results was the gravimetric method. The corrosion rates were calculated on the basis of the results obtained by the gravimetric method. The results showed that the titanium alloy is more corrosion resistant in artificial saliva with the addition of hydrochloric acid up to pH = 2, while stainless steel is more corrosion resistant in other media. The calculated corrosion rates are still relatively low and we have therefore confirmed that both titanium alloy and stainless steel are suitable for use as dental implants korozija titanova zlitina nerjavno jeklo umetna slina pasivni film gravimetrična metoda corrosion titanium alloy stainless steel artificial saliva passive film gravimetric method true true false [T. Flis] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2023-08-15 18:46:44 2023-09-07 07:52:56 2023-10-28 03:16:35 0000-00-00 00:00:00 2023 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (VIII, 42 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.193.4(043.2) 170150659 VS_Flis_Tajda_2023.pdf VS_Flis_Tajda_2023.pdf 1 E5EFE8F2DEC951A4FE891AAFC218BAE0 4720a045b7b672f929a8773f508715ff65744a922d7bec243e476c048676202d 13aa28ad-4cfa-11ee-8fb0-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=171702 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0