Ferreira da Silva Pollyanna Nogueira, Anami Lilian Costa, Bottino Marco Antonio, Souza Rodrigo, de Melo Renata Marques, Saavedra Guilherme
Int J Periodontics Restorative Dent. 2018 Nov/Dec;38(6):865-871. doi: 10.11607/prd.3500.
The aim of this study was to assess the powdering technique and its effects on the flexural strength of bilayered zirconia. Bars made of zirconia partially stabilized by yttrium (Y-TZP) received porcelain by the following techniques (n = 10 per group): (1) L: VM9 application; (2) P: powdering technique + VM9 application; (3) C: Y-TZP coloring before sintering + Y-TZP sintering + VM9 application; or (4) CP: Y-TZP coloring before sintering + Y-TZP sintering + powdering technique + VM9 application. The powdering technique consisted of the application of VM9 margin powder followed by sintering. The samples were subjected to a 4-point flexural strength test and contact angle. Data were analyzed by one-way ANOVA and Tukey test (α = 5%). Surface treatments did not affect the flexural strength of bilayered specimens (P = .1264), but contact angle was affected by surface treatments (P < .0001), wherein the association of coloring and powdering (CP) reached higher values of wettability. Powdering did not affect the flexural strength of bilayered specimens, but did increase the Y-TZP wettability.
本研究的目的是评估粉末技术及其对双层氧化锆弯曲强度的影响。由钇部分稳定的氧化锆（Y-TZP）制成的棒材通过以下技术施加瓷粉（每组n = 10）：（1）L：VM9应用；（2）P：粉末技术+ VM9应用；（3）C：烧结前Y-TZP着色+ Y-TZP烧结+ VM9应用；或（4）CP：烧结前Y-TZP着色+ Y-TZP烧结+粉末技术+ VM9应用。粉末技术包括施加VM9边缘粉末然后烧结。对样品进行四点弯曲强度测试和接触角测量。数据通过单向方差分析和Tukey检验进行分析（α = 5%）。表面处理不影响双层试样的弯曲强度（P = 0.1264），但接触角受表面处理影响（P < 0.0001），其中着色和粉末处理（CP）的组合达到更高的润湿性值。粉末处理不影响双层试样的弯曲强度，但确实增加了Y-TZP的润湿性。
