Ispitivanje hrapavosti površine glazirane Y-TZP zubne keramike nakon izlaganja korozivnom mediju

• Main Authors: Štefančić, Sanja; Dental Polyclinic Zagreb, Zagreb, Croatia; [e-mail], Ćurković, Lidija; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia, Baršić, Gorana; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia, Majić-Renjo, Marijana; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia, Mehulić, Ketij; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
• Format: Text
• Language: Croatian; English
• Published: School of Dental Medicine, University of Zagreb, Croatian Dental Society - Croatian Medical Association 2013
• Subjects: keramika; svojstva površina; korozija; Dental Porcelain; Surface Properties; Corrosion; Puta; sami
• Online Access: http://hrcak.srce.hr/104985; http://hrcak.srce.hr/file/154305; http://hrcak.srce.hr/file/154306

Uvod: Cirkonij-oksidna (Y–TZP) keramika zbog specifičnih svojstava često se primjenjuje u stomatologiji. Gradivni materijal može korodirati ako na njegovoj površini postoji razlika u koncentraciji elektrolita. Nekvalitetna obrada površine nadomjeska pridonosi korozivnim procesima koji i sami dodatno narušavaju površinsku morfologiju. Svrha ovog istraživanja bila je ustanoviti kemijsku stabilnost glaziranog Y–TZP-a mjerenjem parametara hrapavosti površine. Materijali i metode: Pripremljeno je pet uzoraka keramike Y–TZP (BruxZir, Glidewell Laboratories © 2012) s dodatkom pigmenta A 3. Svi su bili sinterirani, polirani i glazirani – tako su simulirani završni postupci u izradi monolitičkih nadomjestaka. Nakon određivanja mase uzorka svaki je uronjen u 10 mL 4-postotne otopine octene kiseline. Svi parametri hrapavosti izmjereni su pet puta i to prije izlaganja korozivnom mediju i poslije toga postupka. Rezultati: Značajan porast izmjerenih parametara hrapavosti, u odnosu na početne vrijednosti, upućuje na prodiranje 4-postotne vodene otopine octene kiseline. Zabilježen je i gubitak težine uzoraka i to u iznosu od 2,45 mg/cm2 ± 0,026. Zaključak: Vrlo kiseli uvjeti povećavaju površinsku hrapavost glazirane zubne keramike Y–TZP. Introduction: Among dental applications, the zirconia based ceramics are widespread because of their general properties. The changes in superficial surface roughness correspond to the structural changes in the material caused by the influence of corrosion. The aim of this study was to determine chemical stability of glazed Y-TZP using surface roughness measurements. Materials and methods: Five samples of Y-TZP material BruxZir (Glidewell Laboratories © 2012.) with the addition of pigment A3 were sintered, polished and glazed to imitate the finishing process in producing monolithic crowns. After determining the mass of the sample, each sample was immersed in 10 ml of 4 wt. % CH3COOH aqueous solution. The roughness was measured five times before and after immersion. Results: All measured roughness parameters have significantly increased, showing higher penetration depth in all surface areas after immersion in 4 wt. % CH3COOH aqueous solution compared to the initial values. Weight loss of investigated dental ceramics samples was 2.45 mg/cm2 ± 0.026. Conclusion: Highly acidic conditions augment surface roughness of Y-TZP glazed dental ceramics.