20.500.12556/RUL-152405 Vpliv tehnologij površinske obdelave kovinskega ogrodja na pojav napak v mikrostrukturi porcelanskega plašča pri kovinsko/porcelanskih zobnih restavracijah Influence of metal surface finishing on porcelain microstructure failures in porcelain-fused-to-metal dental restoration Čeprav je sodobni trend v fiksni protetiki v uporabi polnokeramičnih zobnih nadomestkov, so raziskave pokazale, da se še vedno najpogosteje uporabljajo kovinsko-porcelanski zobni nadomestki. Namen v tem prispevku predstavljene raziskave je ugotoviti, kako različne tehnike mehanske obdelave površine kovinskega ogrodja vplivajo na pojav napak v porcelanskem sloju ter mejni površini kovina-porcelan. V okviru izvedenih raziskav smo izdelali vzorce iz Co-Cr zlitine z različnimi metodami in tehnikami površinske obdelave. Sledila je priprava metalografskih obrusov s pomočjo katerih smo analizirali vpliv površinskih obdelav na spremembo makro- in mikrostrukture kovinskega ogrodja, porcelanskega plašča in mejne površine med njima. Rezultati opravljenih raziskav so pokazali, da je pojav napak pri vzorcih katerih kovinsko ogrodje je bilo obdelano z brusnim sredstvom v eni smeri minimalen, površina kovinskega ogrodja enakomerno hrapava z enakomerno povprečno debelino oksidne plasti 3,5µm. Pri vzorcih s kovinskim ogrodjem obdelanim z brusnim sredstvom v več smereh, smo opazili bolj hrapavo površino kovinskega ogrodja s prisotnostjo plastične deformacije površine kovinskega ogrodja, ki tvori tanjšo oksidno plast. Although the current trend in fixed prosthetics is the use of full-ceramic dental restorations, research has shown that most commonly used are still metal-ceramic dental restorations. The purpose of the research presented in this paper is to find out how different techniques of mechanical treatment of the surface of the metal frame affect the occurrence of defects in the porcelain layer and the metal-porcelain interface. As part of the research, we produced samples from Co-Cr alloy using various surface treatment methods and techniques, followed by the preparation of metallographic tablecloths, with the help of which we analyzed the influence of surface treatments on the change in the macro- and microstructure of the metal framework, the porcelain veneer and the interface between them. The results of the conducted research showed that the occurence of defects in samples whose metal surface was treated with an abrasive in one direction is minimal, the surface of the metal framework is uniformly rough with an average thickness of the oxide layer of 3,5µm. In samples with a metal framework treated with an abrasive in several directions, we observed a rougher surface of the metal framework with the presence of plastic deformation of the surface of the metal framework, which forms a thinner oxide layer. kovinsko-porcelanska prevleka mehanska obdelava kovinskega ogrodja brusna sredstva peskanje mikrostruktira metal-ceramic crown metal framework processing abrasive stones sandblasting microstructure true false true Slovenski jezik Angleški jezik Članek v reviji 2023-11-23 11:43:32 2023-11-23 11:43:34 2023-11-24 03:54:53 0000-00-00 00:00:00 2023 0 0 Str. 35-57 št. 2 Letn. 13 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2023-01-01 616.31 2232-416X 10.18690/analipazu.13.2.35-58.2023 173363715 3290-Besedilo_prispevka-9267-1-10-20231106.pdf 3290-Besedilo_prispevka-9267-1-10-20231106.pdf 1 AE2F70603B5ADF86F7FF0C6461F9CCA5 585c8296d66c1008681ba0be7e5abfdfb06d91cfa3395e1b99c74e2b00a90555 f2f020be-89f3-11ee-a702-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=177906 https://journals.um.si/index.php/anali-pazu/article/view/3290 1 27f3e958-89ed-11ee-a702-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=177903 Zdravstvena fakulteta 0 0 0