Preliminary studies on the effects of in situ synthesized polycrystalline particulates on the bonding strength of resin to zirconia ceramic surface

详细信息    查看全文

• 作者：Yueming Tian^a ; ¹ ; Lingling Zhang^a ; ¹ ; Zutai Zhang^a ; ^{showazhang@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Ning Ding^a ; Yan Liu^a ; Guozhong Tian^b
• 关键词：Zirconia ; In situ synthesis ; Polycrystalline particulates ; Surface ; Mechanical strength
• 刊名：Applied Surface Science
• 出版年：2015
• 出版时间：1 December 2015
• 年：2015
• 卷：357
• 期：part_PA
• 页码：961-967
• 全文大小：3610 K

文摘

To develop a novel zirconia surface modification method to improve the shear bond strength of resin cement. Yttrium-stabilized tetragonal zirconia (Y-TZP) discs were cut from prefabricated ceramic blocks and polished through 1200-grit SiC abrasive. Based on the immersion time of zirconia disc in HF solution, zirconia samples were divided into four groups. Then, put samples to CaCl₂ solution, dipped in NaOH solution from 20 °C to 80 °C in a water bath, kept at 80 °C for 2 h. After final sintering, surface appearance and chemical components were characterized with scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD), respectively. The surface roughness of discs was measured as well. Shear bond strength of zirconia to resin cement was tested and the failure mode was analyzed. Three point bending tests were done to determine the flexural strength of samples. The statistical analysis was also done for all above data. ZrO₂ polycrystalline particulates were in situ synthesized on the surface of zirconia substrates. The Ra values of the four groups were 0.27 ± 0.05 μm, 0.89 ± 0.34 μm, 1.04 ± 0.41 μm and 1.41 ± 0.38 μm, respectively. The treated group was statistically significant different from the control group (p < 0.05). Shear bond strength values of the four groups were 7.88 ± 1.94 MPa, 11.87 ± 3.7 MPa, 17.84 ± 6.21 MPa and 16.27 ± 5.87 MPa, respectively, and those of I₅ and I₇ were statistically different from that of C (p < 0.05). The failure mode was mainly adhesive in group C and mixed in I₅. Three point bending strength values of the four groups were 730.21 ± 56.91 MPa, 689.81 ± 73.75 MPa, 704.25 ± 91.44 MPa and 702.28 ± 86.05 MPa, respectively, without statistically significant difference between each other (p > 0.05).

In the conclusion, in situ synthesized polycrystalline particulates on zirconium ceramic surface can effectively improve the bonding strength of resin, avoid micro cracks and maintain the mechanical strength of ceramics.