Analiza izvora napak pri izdelavi kovinsko-porcelanskih restavracij : diplomsko delo

Lukinović, Zlata (author), Brunčko, Mihael (mentor), Rojko, Franc (comentor), Levec, Tina (reviewer)

Uvod: Kovinsko-porcelanske restavracije so dandanes najbolj uporabljane in predstavljajo standard v rekonstruktivnem in estetskem zobozdravstvu. V diplomskem delu smo izdelali in opisali izdelavo šestih individualno izdelanih kovinsko-porcelanskih prevlek, kjer smo posebni poudarek namenili napakam pri litju. V zobnih laboratorijih se srečujemo s pretaljevanjem, zato smo se odločili primerjati novo in že uporabljano zlitino. Namen: Namen diplomskega dela je prikazati postopek izdelave individualnih kovinsko-porcelanskih prevlek in analizirati možne napake pri uporabi večkrat pretaljene zlitine in raziskati škodljive vplive ponovnega pretaljevanja Co-Cr zlitine na mikrostrukturo stične površine in jakost vezi med zlitino in porcelansko maso. Metode dela: Teoretični del temelji pregledu strokovne literature v znanstvenih in strokovnih revijah ter strokovnih knjigah. Literaturo sem iskala s pomočjo portalov COBISS, Google Učenjak in DiKul, ter spletnih strokovnih baz MEDLINE in PubMed. Literatura vsebuje slovenske in tuje strokovne vire, ki so mlajši od 10 let. V eksperimentalnem delu diplomskega dela so bili izdelani kovinsko-porcelanski preizkušanci za analizo jakosti vezi med kovinskim ogrodjem in porcelansko maso ter karakterizacijo mikrostrukture stične površine. Praktični del diplomskega dela temelji na analizi rezultatov, ki smo jih dobili med izdelavo preizkušancev, karakterizacijo mehanskih lastnosti ter mikrostrukture. Rezultati: V rezultatih smo predstavili izdelavo kovinsko-porcelanskih preizkušancev za analizo jakosti vezi med kovinskim ogrodjem in porcelansko maso ter karakterizacijo mikrostrukture stične površine. Preizkušance smo stereolitografsko natisnili, vložili v tri kivete ter jih ulili iz Co-Cr zlitine, ki so bile pretaljene enkrat, trikrat in šestkrat. Naredili smo analizo mikrostrukture večkrat pretaljene Co-Cr zlitine. Na preizkušance smo sintrali porcelansko maso in opravili strižni preizkus za določitev jakosti vezi med kovinskim ogrodjem in porcelansko maso ter analizirali mikrostrukturo stične površine s pomočjo svetlobnega mikroskopa. Razprava in zaključek: Pri analizi mikrostrukture pri večkratnemu pretaljeni zlitini je opaziti tanjšanje oksidne plasti; s tem se zmanjšajo tudi oksidi, ki so ključni za ustrezno kemijsko-mehansko vez. Cilj strižnega preizkusa je bil ugotoviti strižne trdnosti vezi med pretaljeno zlitino oziroma kovinskimi ogrodji in porcelansko maso. Pretaljevanje zlitine močno vpliva na sestavo in trdnost vezi med zlitino in porcelansko maso, ki je ključna za kvalitetno izdelano protetično restavracijo.

• Language: Slovenian
• Keywords: diplomska dela, laboratorijska zobna protetika, kovinsko-porcelanska vez, Co-Cr zlitina, pretaljevanje, oksidna plast, dentalni porcelan
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: ZF - Faculty of Health Sciences
• Place of publishing: Ljubljana
• Publisher: [Z. Lukinović]
• Year: 2020
• Number of pages: 59 str., [1] str. pril
• PID: 20.500.12556/RUL-116767
• UDC: 616.31
• COBISS.SI-ID: 18997251
• Publication date in RUL: 10.06.2020

LUKINOVIĆ, Zlata, 2020, Analiza izvora napak pri izdelavi kovinsko-porcelanskih restavracij : diplomsko delo [online]. Bachelor’s thesis. Ljubljana  : Z. Lukinović. [Accessed 31 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=116767

Secondary language

• Language: English
• Title: Analysis of the source of defects in the manufacture of metal-porcelain restorations : diploma work

Abstract

Introduction: Metal-porcelain restorations are the most used restorations and represent the standard in reconstructive and esthetic dentistry. In the thesis, we made and described the production of seven individually made metal-porcelain coatings with particular emphasis on casting faults. In dental laboratories, we deal with the melting on daily basis. Therefore, a comparison between the new and the used alloy was made to check whether and how re-melting affects the bond strength between the alloy and the porcelain mass. Purpose: The purpose is to present the process of manufacturing individual metal-porcelain coatings, to analyze possible errors in the use of multiple molten alloys, to investigate the adverse effects of Co-Cr alloy re-melting on the contact surface microstructure, and to bond strength between the alloy and the porcelain mass. Methods: The theoretical part is based on the review of literature in scientific and peer-reviewed journals and books. Literature was searched in COBISS, Google Scholar, and DiKul, as well as in MEDLINE and PubMed. The literature used is in Slovene and English and not older than 10 years. In the experimental part, metal-porcelain test pieces were made to analyze the bond strength between the metal frame and the porcelain mass to characterize the microstructure of the contact surface. The practical part is based on the analysis of the results obtained during test pieces production, characterization of mechanical properties, and microstructure. Results: The results illustrate the making of metal-porcelain test pieces for the analysis of bond strengths between the metal frame and porcelain mass and characterization of the microstructure of the contact surface. The test pieces were made with stereolithographica printing. They were loaded into three cuvettes and cast with Co-Cr alloys and melted once, three times, and six times. The analysis of the microstructure of a multi-molten Co-Cr alloy was performed. Sinter porcelain was sintered on the test pieces and a shear test of the bond strength between the metal frame and the porcelain mass was analyzed. The microstructure of the contact surface was analyzed using a light microscope. Discussion and conclusion: In the analysis of the microstructure, in multiple molten alloys, a thinning of the oxide layer is observed, reducing the oxides crucial for the corresponding chemical-mechanical bond. The aim of the shear test was to determine the shear strengths of the bond between molten alloy or the metal frames and porcelain mass. Alloy melting strongly influences the composition and strength of the bond between the alloy and the porcelain mass, which is crucial for a quality prosthetic restoration.

• Keywords: diploma thesis, laboratory dental prosthetics, metal-porcelain bond, Co-Cr alloy, melting, oxide layer, dental porcelain