Yoon Hyung-In, Noh Hyo-Mi, Park Eun-Jin
Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
Department of Clinical Oral Health Science Graduate School of Clinical Dentistry, Ewha Womans University, Seoul, Republic of Korea.
J Adv Prosthodont. 2017 Jun;9(3):188-194. doi: 10.4047/jap.2017.9.3.188. Epub 2017 Jun 19.
This study was to evaluate the effect of repeated ultrasonic scaling and surface polishing with intraoral polishing kits on the surface roughness of three different restorative materials.
A total of 15 identical discs were fabricated with three different materials. The ultrasonic scaling was conducted for 20 seconds on the test surfaces. Subsequently, a multi-step polishing with recommended intraoral polishing kit was performed for 30 seconds. The 3D profiler and scanning electron microscopy were used to investigate surface integrity before scaling (pristine), after scaling, and after surface polishing for each material. Non-parametric Friedman and Wilcoxon signed rank sum tests were employed to statistically evaluate surface roughness changes of the pristine, scaled, and polished specimens. The level of significance was set at 0.05.
Surface roughness values before scaling (pristine), after scaling, and polishing of the metal alloys were 3.02±0.34 µm, 2.44±0.72 µm, and 3.49±0.72 µm, respectively. Surface roughness of lithium disilicate increased from 2.35±1.05 µm (pristine) to 28.54±9.64 µm (scaling), and further increased after polishing (56.66±9.12 µm, <.05). The zirconia showed the most increase in roughness after scaling (from 1.65±0.42 µm to 101.37±18.75 µm), while its surface roughness decreased after polishing (29.57±18.86 µm, <.05).
Ultrasonic scaling significantly changed the surface integrities of lithium disilicate and zirconia. Surface polishing with multi-step intraoral kit after repeated scaling was only effective for the zirconia, while it was not for lithium disilicate.
本研究旨在评估使用口腔内抛光套件进行反复超声洁治和表面抛光对三种不同修复材料表面粗糙度的影响。
用三种不同材料制作了总共15个相同的圆盘。在测试表面进行20秒的超声洁治。随后，使用推荐的口腔内抛光套件进行30秒的多步抛光。使用三维轮廓仪和扫描电子显微镜研究每种材料在洁治前（原始状态）、洁治后和表面抛光后的表面完整性。采用非参数Friedman检验和Wilcoxon符号秩和检验对原始、洁治和抛光标本的表面粗糙度变化进行统计学评估。显著性水平设定为0.05。
金属合金在洁治前（原始状态）、洁治后和抛光后的表面粗糙度值分别为3.02±0.34 µm、2.44±0.72 µm和3.49±0.72 µm。二硅酸锂的表面粗糙度从2.35±1.05 µm（原始状态）增加到28.54±9.64 µm（洁治后），抛光后进一步增加（56.66±9.12 µm，P<0.05）。氧化锆在洁治后粗糙度增加最多（从1.65±0.42 µm增加到101.37±18.75 µm），而抛光后其表面粗糙度降低（29.57±18.86 µm，P<0.05）。
超声洁治显著改变了二硅酸锂和氧化锆的表面完整性。反复洁治后使用多步口腔内套件进行表面抛光仅对氧化锆有效，而对二硅酸锂无效。
