Sinmazisik Gulden, Tarcin Bilge, Demirbas Bulent, Gulmez Turgut, Bor Emire, Ozer Fusun
Department of Dental Prosthetics Technology, Vocational School of Health Services, Marmara University.
Dent Mater J. 2015;34(5):640-7. doi: 10.4012/dmj.2014-340.
The aim of this study was to assess the effect of zirconia core thickness on the biaxial flexural strength values of zirconia-porcelain bilayered discs. A total of 60 discs with 0.3, 0.4, and 0.5 mm thickness were obtained from a fully sintered zirconia block. A 1.5-mm thick layer of veneer porcelain was fired on the zirconia specimens and biaxial flexural strength tests were performed on the bilayered discs. In each group, the loading surface was the veneer porcelain in half of the specimens (core in tension) and the zirconia core surface in the other half (core in compression). The zirconia core thickness had no effect on the biaxial flexural strength of zirconiaporcelain bilayered discs when the core was in tension (p>0.05). Whereas, when the core was in compression, an increase in the zirconia core thickness resulted in an increase in the biaxial flexural strength (p<0.05).
本研究的目的是评估氧化锆核厚度对氧化锆-瓷双层盘片双轴弯曲强度值的影响。从完全烧结的氧化锆块中获取了总共60个厚度分别为0.3、0.4和0.5毫米的盘片。在氧化锆试样上烧制一层1.5毫米厚的饰面瓷，并对双层盘片进行双轴弯曲强度测试。在每组中，一半试样的加载表面为饰面瓷（核受拉），另一半试样的加载表面为氧化锆核表面（核受压）。当核受拉时，氧化锆核厚度对氧化锆-瓷双层盘片的双轴弯曲强度没有影响（p>0.05）。然而，当核受压时，氧化锆核厚度的增加会导致双轴弯曲强度增加（p<0.05）。
