Karakterizacija mikrostrukture in lastnosti dentalne ZrO2-keramike : diplomsko delo

Krajnc, Natalija (avtor), Anžel, Ivan (mentor), Rojko, Franc (komentor), Fošnarič, Miha (recenzent)

Uvod: Oksidna keramika se je v medicini najprej uveljavila v ortopediji, v 20. stoletju pa so jo zaradi njenih dobrih mehanskih lastnosti začeli uporabljati tudi v zobozdravstvu. Najpogostejša oksidna keramika je izdelana na osnovi cirkonijevega oksida in aluminijevega oksida. Pri dentalni cirkonijevi oksidni keramiki ločimo ZrO2, stabiliziran z magnezijevim oksidom, ZrO2, stabiliziran z aluminijevim oksidom, in ZrO2, stabiliziran z itrijem. S pojavom sistemov CAD/CAM so se razvili tudi novi načini izdelave zobnoprotetičnih nadomestkov. Namen: V diplomskem delu raziskujemo dentalno cirkonijevo oksidno keramiko, analiziramo njene prednosti in slabosti ter se seznanjamo z načini izdelave zobnih nadomestkov iz te keramike. Ugotavljamo tudi vpliv različnih obdelav na mikrostrukturo in lastnosti cirkonijeve oksidne keramike. Cilj diplomskega dela je identificirati optimalno pot za izdelavo izbranega zobnega nadomestka iz ZrO2-keramike. Metode dela: V prvem sklopu diplomskega dela smo teoretične osnove pridobili s pregledom literature o ZrO2-keramiki. Uporabili smo literaturo domačih in tujih avtorjev, ki smo jo našli v podatkovnih bazah na medmrežju (GoogleScholar, PubMed, ScienceDirect, Elsevier, ResearchGate). Ključne besede, s katerimi smo iskali, so: dentalna keramika, cirkonijev oksid, CAD/CAM, obdelava cirkonijevega oksida. Rezultati: Na Fakulteti za strojništvo smo pripravili preizkušance treh različnih obdelav ZrO2. Primerjali smo rezultate upogibnega preizkusa in analizirali mikrostrukturo obdelav. Razprava in sklep: Na podlagi upogibnega preizkusa na trdnost ZrO2-keramike znatno vpliva proces sintranja. Iz rezultatov lahko sklepamo, da ima najmanjšo trdnost surova ZrO2-keramika, najvišjo pa ZrO2-keramika, obdelana po sintranju. Analiza mikrostrukture pri sintrani ZrO2-keramiki je bila v notranjosti in na robu preizkušanca podobna, medtem ko smo na robu ZrO2-keramike, obdelane po sintranju, našli več napak. S ponovnim preizkusom bi rezultate lahko izboljšali z večjim številom preizkušancev. Prav tako bi v analizo mikrostrukture s spremenjenimi parametri sintranja lahko vključili surovo ZrO2-keramiko.

• Jezik: Slovenski jezik
• Ključne besede: diplomska dela, laboratorijska zobna protetika, dentalna keramika, cirkonijev oksid, CAD/CAM, obdelava cirkonijevega oksida
• Vrsta gradiva: Diplomsko delo/naloga
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: ZF - Zdravstvena fakulteta
• Kraj izida: Ljubljana
• Založnik: [N. Krajnc]
• Leto izida: 2021
• Št. strani: 29 str., [11] str. pril.
• PID: 20.500.12556/RUL-132791
• UDK: 616.31
• COBISS.SI-ID: 83399427
• Datum objave v RUL: 03.11.2021

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Characterisation of microstructure and properties of dental ZrO2 ceramics : diploma work

Izvleček

Introduction: Oxide ceramics initially found their way to medicine through the field of orthopaedics and eventually progressed to dentistry where they became prominent in the 20th century due to their excellent mechanical properties. The most commonly used oxide ceramics are based on the ZrO2 molecule and aluminium oxide. We differentiate between three types of dental ZrO2: magnesia stabilized ZrO2, alumina stabilized ZrO2 and yttria stabilized ZrO2. With the onset of CAD/CAM systems, new ways of making prosthetic dental products have also been developed. Purpose: The purpose of this graduation thesis is to study the dental ZrO2 ceramics, analyse their advantages and disadvantages, as well as getting familiar with different manufacturing processes of prosthetic dental products made from this type of ceramics. In addition, we will study how various treatments influence the microstructure and its general properties. The aim of the graduation thesis is to identify the optimal procedure for making a ZrO2 prosthetic dental product. Methods: The first part of the graduation thesis is dedicated to the theoretical background, which we acquired by examining the existing literature on ZrO2 ceramics. We studied both domestic and foreign sources found on international databases (GoogleScholar, PubMed, ScienceDirect, Elsevier, ResearchGate). Keywords that were used in this research were: dental ceramics, zirconium oxide, CAD/CAM, and zirconium oxide processing. Results: We prepared test specimens of three different ZrO2 treatments at the Faculty of Mechanical Engineering in Maribor. Then we compared the results of the tensile tests and analysed the microstructure of the processed specimens. Discussion and conclusion: Based on the tensile tests, the strength of ZrO2 ceramics is significantly affected by the sintering process. The results have shown that the pure ZrO2 ceramic has the lowest tensile strength, while the mechanically treated and sintered ZrO2 has the highest. The analysis of the sintered ZrO2 ceramic’s microstructure has shown that the interior and the exterior of the sample remained the same. On the other hand, the microstructure of the sintered and mechanically treated ZrO2 ceramic has shown more defects on its exterior. The results could be improved by another test including more specimens. In addition, the analysis of the microstructure with modified sintering parameters could include a pure ZrO2 ceramic.

• Ključne besede: diploma theses, laboratory dental prosthetics, dental ceramics, zirconium oxide, CAD/CAM, the processing of ZrO2