Postgraduate student, Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University, Gangneung, Republic of Korea.
Professor, Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University, Gangneung, Republic of Korea.
J Prosthet Dent. 2018 Aug;120(2):282-289. doi: 10.1016/j.prosdent.2017.10.022. Epub 2018 Mar 15.
Little information is available for the strength of bonding between zirconia and lithium disilicate as affected by surface pretreatment methods.
The purpose of this in vitro study was to investigate the shear bond strength (SBS) between zirconia core and lithium disilicate (LS) veneered ceramic after surface pretreatments.
Fully sintered yttrium oxide partially stabilized tetragonal zirconia (Y-TZP) disk specimens were fabricated from zirconia ceramic materials. Specimens were divided into 4 groups with surface pretreatments applied (the as-received group, the liner group, the airborne-particle abrasion group, and the airborne-particle abrasion-plus-liner group). After pressing LS on a zirconia disk, shear force was applied perpendicular to the zirconia-LS interface. Data were analyzed using 2-way ANOVA and Tukey test (α=.05). For each group, the failure modes were measured by using optical microscopy, scanning electron microscopy, energy dispersive x-ray spectroscopy, and x-ray diffraction.
Airborne-particle abrasion induced significantly lower interfacial strength between zirconia and lithium disilicate (P<.05). After airborne-particle abrasion of the surface, the increased monoclinic volume fraction and reduced coefficient of thermal expansion of zirconia may weaken the interfacial strength between zirconia and LS. The liner treatment significantly improved the adhesion between zirconia core and veneering LS (P<.05). The SBS values decreased in the following order: liner group > airborne-particle abrasion-plus-liner group > airborne-particle abrasion group. The interfacial image of zirconia and LS showed a fusion of crystal structure between the 2 materials. Some components of the silica-containing glass-ceramic liner led to an increase in SBS as diffusion occurred on the zirconia surface.
The bond strength between zirconia and veneering LS was significantly increased by application of silica-containing glass-ceramic liner but was decreased with airborne-particle abrasion.
关于氧化锆与锂硅灰石之间结合强度受表面预处理方法影响的信息有限。
本体外研究的目的是调查经表面预处理后氧化锆核与锂硅灰石（LS）贴面陶瓷之间的剪切结合强度（SBS）。
采用氧化锆陶瓷材料制备完全烧结的氧化钇部分稳定四方氧化锆（Y-TZP）圆盘试件。将试件分为 4 组，分别采用不同的表面预处理方法（未处理组、衬层组、喷丸处理组和喷丸+衬层组）。在将 LS 压在氧化锆盘上后，垂直于氧化锆-LS 界面施加剪切力。采用 2 因素方差分析和 Tukey 检验（α=.05）对数据进行分析。对于每组，通过光学显微镜、扫描电子显微镜、能谱分析和 X 射线衍射测量其失效模式。
喷丸处理显著降低了氧化锆与锂硅灰石之间的界面强度（P<.05）。表面喷丸处理后，氧化锆中四方相体积分数增加和热膨胀系数降低，可能会削弱氧化锆与 LS 之间的界面强度。衬层处理显著改善了氧化锆核与贴面 LS 之间的附着力（P<.05）。SBS 值的降低顺序为：衬层组>喷丸+衬层组>喷丸组。氧化锆和 LS 的界面图像显示出 2 种材料的晶体结构融合。含硅玻璃陶瓷衬层的某些成分在氧化锆表面发生扩散，导致 SBS 增加。
应用含硅玻璃陶瓷衬层显著提高了氧化锆与贴面 LS 之间的结合强度，但喷丸处理会降低其结合强度。
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