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Title:Korozijske lastnosti cirkonija v umetni slini z dodatkom organskih in ortofosforne kisline : diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje
Authors:ID Kobe Stožinič, Laura (Author)
ID Slemnik, Mojca (Mentor) More about this mentor... New window
ID Kristl, Matjaž (Comentor)
Files:.pdf VS_Kobe_Stozinic_Laura_2024.pdf (3,16 MB)
MD5: F21E3C1C8670ECFB2E9A43D92D58C1ED
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Zaradi vse pogostejše uporabe cirkonijevih implantatov, je bil namen diplomske naloge raziskati korozijske lastnosti cirkonija v umetni slini z dodatkom organskih in ortofosforne kisline. Osnovna raztopina, ki je služila kot agresivni medij, je bila umetna slina v prisotnosti najpogostejših kislin, ki jih vnašamo v ustno votlino s hrano in pijačo. Kisline, ki smo jih glede na priporočene dnevne vnose dodajali umetni slini, so bile različne organske: vinska, jabolčna in mlečna ter ortofosforna kislina. Eksperimentalni del smo izvedli z gravimetrično metodo, pri temperaturi 37 °C, kar je optimalna telesna temperatura človeka in pri atmosferskem tlaku 101,3 kPa, na ta način smo se čim bolj približali pogojem v ustni votlini. Pred samim postopkom gravimetrije smo pripravili raztopino umetne sline s preračunanimi količinami organskih in ortofosforne kisline. Sam postopek gravimetrije je vključeval naslednje korake: vzorce, ki smo jih termostatirali smo predhodno ustrezno pripravili, kar je zajemalo postopke brušenja, poliranja, razmastitve, ultrazvočnega čiščenja in sušenja s komprimiranim zrakom. Tako pripravljene vzorce smo stehtali in termostatirali v raztopinah 24, 48, 72 in 96 h. Po pretečenem času smo korodirane vzorce ponovno ustrezno očistili in stehtali. Na podlagi spremembe mase vzorca pred in po izpostavitvi raztopini smo izračunali korozijsko hitrost. Tako smo ugotovili, katera kislina povzroča največje korodiranje cirkonija oziroma v kateri kislini je cirkonij najbolj odporen in tvori stabilen pasivni film. Z vrstičnim elektronskim mikroskopiranjem smo posneli površine nekaterih vzorcev. Po 24, 48, 72 in 96 urni pasivaciji, so rezultati pokazali, da na spološno cirkonij tvori najbolj stabilen pasivni film v raztopini umetne sline z dodatkom jabolčne kisline. Najmanj odporen je v raztopini umetne sline z dodatkom mlečne kisline do 48 ur pasivacije, po 48 urah pa korozijske hitrosti cirkonija v raztopini umetne sline z dodatkom mlečne kisline padajo, medtem, ko v raztopini umetne sline z dodatkom vinske kisline naraščajo. Izračunane korozijske hitrosti so v splošnem nizke, kar pomeni, da je cirkonij v kovinski obliki glede korozije primeren material za medicinske vsadke.
Keywords:cirkonij, umetna slina, dentalni implantati, korozija, organske kisline, ortofosforna kislina
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[L. Kobe Stožinič]
Year of publishing:2024
Number of pages:1 spletni vir (1 datoteka PDF (VIII, 35 f.))
PID:20.500.12556/DKUM-90001 New window
UDC:620.193.47:669.296(043.2)
COBISS.SI-ID:216343811 New window
Publication date in DKUM:10.09.2024
Views:252
Downloads:59
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:21.08.2024

Secondary language

Language:English
Title:Corrosion properties of zirconium in artificial saliva with addition of organic and orthophosphoric acids
Abstract:Due to the increasing use of zirconium implants, the aim of the thesis was to investigate the corrosion properties of zirconium in artificial saliva with the addition of organic and orthophosphoric acids. The basic solution used as corrosion medium was therefore artificial saliva in the presence of the most common acids introduced into the oral cavity by food and drink. The acids added to the artificial saliva according to the recommended daily intakes were various organic acids: tartaric, malic, lactic and orthophosphoric acids. The experimental part was carried out using the gravimetric method, at a temperature of 37 °C, which is the optimum body temperature for humans, and at an atmospheric pressure of 101,3 kPa, in order to approximate as closely as possible the conditions in the oral cavity. Prior to the gravimetric procedure, an artificial saliva solution was prepared with calculated amounts of organic and orthophosphoric acid. The gravimetric procedure itself involved the following steps: the samples to be thermostatted were properly prepared beforehand, which included grinding, polishing, degreasing, ultrasonic cleaning and compressed air drying. The samples thus prepared were weighed and thermostated in solutions for 24, 48, 72 and 96 h. After the elapsed time, the corroded samples were again cleaned and weighed accordingly. The corrosion rate was calculated from the change in mass of the sample before and after exposure to the solution. This allowed us to determine which acid causes the most corrosion of zirconium or in which acid zirconium is most resistant and forms a stable passive film. After 24, 48, 72 and 96 h of passivation, the results showed that, overall, zirconium forms the most stable passive film in the solution of artificial saliva with the addition of malic acid. It is the least resistant in a solution of artificial saliva with the addition of lactic acid up to 48 h of passivation. After 48 h of passivation, the corrosion rates of zirconium in a solution of artificial saliva with the addition of lactic acid decrease, while in a solution of artificial saliva with the addition of tartaric acid they increase. The calculated corrosion rates are generally low, which means that zirconium in metallic form is a suitable material for medical implants in terms of corrosion.
Keywords:zirconium, artificial saliva, dental implants, corrosion, organic acids, orthophosphoric acid


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