TY - JOUR ID - TI - Impact of Different Surface Treatments on Zirconia Strength AU - Sazan M. Azeez AU - Shatha A. Salih PY - 2021 VL - 18 IS - 4 SP - 387 EP - 393 JO - Medical Journal of Babylon مجلة بابل الطبية SN - 1812156X 23126760 AB - Background: Intraoral polishing of zirconia surfaces had led to a significant increase in the surface smoothness and flexuralstrength of zirconia after surface modifications in the try-in procedure; this is a straightforward procedure and does not needany laboratory interventions. Objectives: The aim of this study was to evaluate the effect of different surface treatments onyttrium-stabilized zirconia restorations. Materials and Methods: In this study, 36 disk-shaped specimens from zirconia blockswere milled using a CAD-CAM machine with 12 mm diameter and 1.4 mm thickness for 27 disks; however, 12 mm diameter and1.2 mm thickness were used for nine disks as a control group. They were sintered and glazed according to the manufacturer’sinstructions. The control group (GA) remained untouched, whereas the other specimens were ground with a diamond rotaryinstrument. The final dimension was 12 mm in diameter and 1.2 ± 0.1 mm in thickness. The disks were divided into three groups:Grinded group (GB) without any additional surface treatment; reglazed group (GC) by adding glaze material; and polishedgroup (GD), polished with an intraoral polishing kit. The specimens were subjected to a biaxial flexural strength (BFS) test.Data were statistically analyzed using one-way analysis of variance and least significant difference (LSD) significant differencetests (a = 0.05). Results: Descriptive statistics shows that the highest BFS was recorded for the GD followed by GB, and bothGA and GC show nearly similar values. The LSD tests revealed that there was a statistically significant difference between GDand GA (P < 0.05), GD had significantly increased the BFS value after being polished compared with other groups, and therewas a statistically significant difference between GB and GA (P < 0.05). However, there was no statistically significant differencebetween GC and GA (P = 0.494). Conclusion: Grinding and polishing techniques significantly increased the flexural strength offull-contoured zirconia, whereas reglazing significantly decreased it.

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