cad a22 4500 390147958 20200501042435.0 cr unu---uuuuu 161201e201612 xx s 000 0 eng 10.5167/uzh-128124 doi 10.1016/j.jmbbm.2016.07.025 doi (ZORA)oai:www.zora.uzh.ch:128124 610 ddc 27497266 pmid Al-Haj Husain Nadin Effect of polishing instruments and polishing regimens on surface topography and phase transformation of monolithic zirconia: An evaluation with XPS and XRD analysis [Elektronische Daten] [Nadin Al-Haj Husain, Josette Camilleri, Mutlu Özcan] openAccess eu-repo PURPOSE: Polishing procedures might alter monolithic zirconia (MZ) surface resulting in phase changes that can be deleterious for clinical performance and antagonist tooth wear. This study investigated the topographical features and phase transformation in MZ after polishing with different regimens simulating the clinical workflow. ​ MATERIALS AND METHODS: MZ specimens (Katana Zirconia HT, Kuraray-Noritake) (12×12×1.8 mm(3)) were grinded and polished using one of the five systems assessed: BG: Silicone carbide polishers (Brownie, Greenie, Super Greenie); CG: Diamond impregnated ceramic polisher kit (Ceragloss); EV: Synthetically bonded grinder interspersed with diamond (EVE Kit); SL: Urethane coated paper with aluminium oxide grits (Soflex Finishing and Polishing System Kit) and DB: Diamond bur (8 µm). Polished specimens were initially roughened with 220 µm diamond burs (Grinding Bur-GB) (10 s, 160.000160,000 rpm) and considered for baseline measurements. Polishing regimens were performed for 10 s using a slow-speed hand piece under water-cooling except for SL, in a custom made device (750 g; 5000 and 75,000 rpm). Surface roughnesses, phase changes (XRD) were assessed, surface characterization was performed (SEM, EDS). RESULTS: The highest roughness was obtained with the EV system (1.11 µm) compared to those of other systems (0.13-0.4 µm) (pθ and minor peak at 34.94°2θ. While GB, CG, EV, SL and DB exhibited a peak shift to the left, BG demonstrated a right peak shift on the 2θ scale. Monoclinic phase change was not noted in any of the groups. CONCLUSION: All polishing methods, except BG, exhibited a peak shift towards the lower angles of the 2-theta scale. Since the peak shifts were in the order of fractions of an angle they are attributed to stress formation rather than a phase change in the material. Thus, all polishing systems tested may not be detrimental for the phase transformation of MZ. EV system resulted in the highest roughness and none of the polishing regimens restored the polishability to the baseline level. Clinic of Reconstructive Dentistry zora Camilleri Josette joint author Özcan Mutlu joint author Journal of the Mechanical Behavior of Biomedical Materials 64:104-112 https://www.zora.uzh.ch/id/eprint/128124/1/660_Effect%20of%20polishing%20instruments%20and%20polishing%20regimens_acc.pdf text/html WWW-Backlink auf das Repository 1 Journal Article PeerReviewed zora ZORA 856 40 https://www.zora.uzh.ch/id/eprint/128124/1/660_Effect%20of%20polishing%20instruments%20and%20polishing%20regimens_acc.pdf text/html WWW-Backlink auf das Repository ZORA 100 1- Al-Haj Husain Nadin ZORA 700 1- Camilleri Josette joint author ZORA 700 1- Özcan Mutlu joint author ZORA 773 0- Journal of the Mechanical Behavior of Biomedical Materials 64:104-112 SWISSBIB 390147958 BK010053 XK010053 XK010000 ZORA ZORA ZORA Journal Article openAccess