Effect of finishing/polishing techniques and low temperature degradation on the surface topography, phase transformation and flexural strength of ultra-translucent ZrO2 ceramic
Effect of finishing/polishing techniques and low temperature degradation on the surface topography, phase transformation and flexural strength of ultra-translucent ZrO2 ceramic
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DOI：
10.1016/j.dental.2020.01.004
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发表时间：
2020-04-01
期刊：
影响因子：
5
通讯作者：
de Assuncao e Souza, Rodrigo Othavio
中科院分区：
文献类型：
--
作者：
Leite Vila-Nova, Taciana Emilia;Gurgel de Carvalho, Isabelle Helena;de Assuncao e Souza, Rodrigo Othavio
Objective.研究了不同的表面处理和抛光制度以及低温降解对超透明ZrO 2陶瓷的抗弯强度、相变和表面形貌的影响。300（n = 15/组）常规氧化锆（Z：Ice Zirkon Transluzent）和超透明氧化锆（UT：Prettau前）棒样本，并根据精整/抛光（C -控制，B -金刚石橡胶抛光机，P -用布尔斯调节，PB -用布尔斯+金刚石抛光机调节，PG -用布尔斯+釉料调节），低温降解（LTD）（在127 ℃，1.7 bar/24 h下进行或不进行处理）。然后，在通用试验机（1 mm/min，500 kgf测力传感器）中进行3点微型弯曲试验。进行了SEM、EDS、XDR、AFM、光学轮廓术和Weibull分析。资料以三因子变异数分析及Tukey事后检定（5%）进行统计分析。ZPBD组（1670 +/- 253 MPa）、ZBD组（1664 +/- 217 MPa）和ZB组（1655 +/- 3678 MPa）的弯曲强度显著高于UTPG组（372 +/- 56 MPa）。与UB、UCD、UPD和UPBD相比，ZPD组的Weibull模量显著更高，而UTB、UTCD和UTPD的值最低。单斜相仅在传统氧化锆组中观察到，在LTD后更加明显。金刚石橡胶抛光剂对两种氧化锆的粗糙度均较小。金刚石橡胶抛光机的使用是氧化锆陶瓷抛光的最合适的精加工/抛光方法，并且最终上釉降低了这些材料的断裂抗力。(C)2020年牙科材料学院。爱思唯尔公司出版All rights reserved.
Objective. To investigate the effect of different surface finishing and polishing regimes and low temperature degradation on flexural strength, phase transformation and surface topog-raphy of ultra-translucent ZrO2 ceramic.Methods. 300 (n = 15/group) of conventional zirconia (Z: Ice Zirkon Transluzent) and ultra-translucent zirconia (UT: Prettau Anterior) bar-specimens were made and divided according to the Finishing/Polishing (C - Control, B - diamond rubber polishers, P - adjusting with burs, PB - adjusting with burs + diamond polishers, PG - adjusting with burs + glaze), Low temperature Degradation (LTD)(with or without a treatment at 127 degrees C, 1.7 bar/24 h). Then, a 3-point mini flexural test was performed in a universal testing machine (1 mm/min, 500 kgf load cell). SEM, EDS, XDR, AFM, optical profilometry and Weibull analysis were performed. Data were analyzed by 3-way ANOVA and Tukey's post-test (5%).Results. Groups ZPBD (1670 +/- 253 MPa), ZBD (1664 +/- 217 MPa), and ZB (1655 +/- 3678 MPa) showed significantly higher flexural strength than the UTPG group (372 +/- 56 MPa). The Weibull modulus was significantly higher for the ZPD group compared to the UB, UCD , UPD and UPBD, while UTB, UTCD and UTPD had the lowest value. Monoclinic phases were observed only in the conventional zirconia groups and were more evident after LTD. Dia-mond rubber polishers presented less roughness for both zirconias.Significance. The use of diamond rubber polishers is the most suitable finishing/polishing method for zirconia ceramic restorations and that final glazing reduces the fracture resis-tance of these materials. (C) 2020 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.