20.500.12556/RUL-104778 Vpliv različnih vrst kompozitnih faset na strižno trdnost fasetiranih prevlek diplomsko delo The influence of different types of composite coating on the shear strength of the metal composite crown diploma work Uvod: Kompoziti se že vrsto let uporabljajo v zobozdravstvu. Sestavljeni so iz matice in utrjevalne faze ter aditivov za izboljšanje adhezije med njima. V zobni protetiki se uporabljajo kompoziti s polimerno matico. Nanaša se jih lahko tudi na zlitine, kjer je potrebna mehanska ali kemijska retencija. Namen: Ugotoviti strižno trdnost med kompozitom in zlitinami, razliko v jakosti vezi med svetlobno in toplotno polimerizirajočim kompozitom ter na podlagi strižnega preizkusa opredeliti katera vez med kovinsko osnovo in kompozitnim plaščem je najboljša. Metode dela: Metoda teoretičnega dela diplomskega dela je deskriptivna, praktični del pa temelji na analizi rezultatov strižnega preizkusa. Rezultati: Preizkušanci so bili izdelani iz dveh zlitin dimenzij Φ 4,3 mm x 1 cm: Ag-Pd in Co-Cr ter treh različnih kompozitnih materialov dimenzij Φ 4,3 mm x 4 mm, od tega en toplotno in dva svetlobno polimerizirajoča. Na podlagi strižnega preizkusa smo izračunali strižno trdnost vezi. S pomočjo računalniškega programa, povezanim z napravo, so se izrisali grafi sile v odvisnosti od raztezka. Strižno trdnost smo izračunali na podlagi najvišje izmerjene sile in ploščine mejne površine med kompozitom in zlitino. Razprava in zaključek: Cilj preizkusa je bilo ugotoviti strižne trdnosti vezi treh različnih kompozitov in dveh različnih zlitin. Mehanski preizkus je pokazal, da ni velike razlike v strižnih trdnostih posameznih kompozitov in zlitin. Prav tako ni bilo velikega odstopanja od strižnih trdnosti, najdenih v literaturi. Trdnosti so nizke, zato izdelave takih prevlek ne bi svetovali. Introduction: Composites have been used in dentistry for several years. They consist of a core, a hardening phase and additives that improve the adhesion between them. Composites with a polymer core are used in dental prosthetics. They can also be applied to alloys requiring mechanical or chemical retention. Purpose: Determine the shear strength between the composites and the alloys, the difference in bond strength between light and heat cured composites and define based on the shear test results which bond between the alloy and composite is the best option. Methods of work: A descriptive method is used for the thesis, while the practical part is based on an analysis of the shear test results. Results: The samples were made of two alloys with dimensions of Φ 4.3 mm × 1 cm, Ag-Pd and Co-Cr, and three different composites with dimensions of Φ 4.3 mm × 4 mm, of which one is heat cured and two are light cured. We obtained the results based on shear tests. With the help of a computer programme connected to the testing device generated graphs of the shear force plotted as a function of the elongation. We calculated the shear strength based on the highest measured force and the boundary-surface area between the composite and the alloy. Discussion and conclusion: The aim of the research was to determine the shear strength of the bonds for three different composites and two different alloys. The findings showed that there are no major differences between the shear strengths of the different composites and alloys. Neither is there any significant deviation from the shear strengths found in the literature. The shear strengths are low, so we advise against the use of these materials for the production of coatings. kompozit mehanska in kemijska vez zlitina kompozit strižna trdnost fasetirana prevleka composite alloy-composite mechanical and chemical bond shear strength metal composite veneer crown true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2018-10-10 07:47:28 2018-10-10 07:47:30 2022-08-17 03:45:19 0000-00-00 00:00:00 2018 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 87895 5512555 5704.pdf 5704.pdf 1 C2C2ED9650EEA331C97A91B83B33C0E6 1000943dad5b3b8864953e50c2c4ebc887f50f2a1663fa6c2e5573a3d0e60cc4 08372ca3-a1b6-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=115307 Zdravstvena fakulteta 0 0 0