Park Chan, Vang Mong-Sook, Park Sang-Won, Lim Hyun-Pil
Graduate student, Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.
Professor Emeritus, Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.
J Prosthet Dent. 2017 Mar;117(3):430-437. doi: 10.1016/j.prosdent.2016.10.005. Epub 2017 Jan 11.
Although many systems are used to polish zirconia, a comparison of the performance of zirconia and feldspathic porcelain polishing systems is lacking.
The purpose of this in vitro study was to compare the effects of 3 polishing systems on surface roughness, zirconia phase transformation, and durability of the polishing systems when applied to zirconia and feldspathic porcelain.
Three polishing systems were evaluated: Z1, a zirconia polishing system; Z2, a zirconia polishing system, and F1, a feldspathic porcelain polishing system. Three ceramic systems were evaluated: PR and ZM zirconia specimens (diameter 15 mm, height 2 mm; 23 specimens each) and CB feldspathic porcelain specimens of the same size (15 specimens). A rough surface was created on the 3 types of specimens (15 specimens each) to model an occlusal adjustment under the same conditions. Polishing was carried out with the 3 polishing systems for 2 minutes each. Surface roughness was measured with a 3-dimensional (3D) optical profiler. The surface was also observed with a scanning electron microscopy. X-ray diffraction analysis was performed for 8 PR or ZM zirconia specimens polished by using the Z1 and Z2 systems for 8 minutes to evaluate the phase transformation of zirconia before, during, and after polishing. These specimens were compared and analyzed for phase transformation that might have occurred during the polishing of the specimens. After finishing the surface roughness experiment and the phase transformation experiment, the volumes of the polishers were measured with a 3D volume scanner and compared with those before the experiments to evaluate the durability of the polishing system. A statistical analysis of all data was performed using 2-way ANOVA and the Tukey honest significant difference test (α=.05).
The 2 zirconia polishing systems (Z1, Z2) created a significantly (P<.001) smoother surface, regardless of the type of specimens used for polishing, than the feldspathic porcelain polishing system (F1). When polishing treatment was carried out on zirconia specimens for 8 minutes, the maximum percentages of monoclinic phase increased by 0.03% in the Z1 system and by 0.09% in the Z2 system. The volume change for the durability evaluation of the polishing system was 13.35 and 29.37% in the Z1 system, 2.05 and 5.92% in the Z2 system, and 3.60 and 4.95% in the F1 system, respectively.
Zirconia polishing systems created a smoother surface on zirconia than the feldspathic porcelain polishing system. No significant changes in the phase transformation of zirconia were found before and after polishing. Each polishing system showed different levels of wear resistance.
尽管有许多系统用于打磨氧化锆，但缺乏对氧化锆和长石质瓷打磨系统性能的比较。
本体外研究的目的是比较三种打磨系统应用于氧化锆和长石质瓷时对表面粗糙度、氧化锆相变及打磨系统耐久性的影响。
评估了三种打磨系统：Z1，一种氧化锆打磨系统；Z2，一种氧化锆打磨系统；F1，一种长石质瓷打磨系统。评估了三种陶瓷系统：PR和ZM氧化锆试件（直径15mm，高2mm；每种23个试件）以及相同尺寸的CB长石质瓷试件（15个试件）。在三种类型的试件上（每种15个试件）制作粗糙表面，以模拟相同条件下的咬合调整。用三种打磨系统分别打磨2分钟。用三维（3D）光学轮廓仪测量表面粗糙度。还用扫描电子显微镜观察表面。对使用Z1和Z2系统打磨8分钟的8个PR或ZM氧化锆试件进行X射线衍射分析，以评估打磨前、打磨过程中和打磨后氧化锆的相变。对这些试件在打磨过程中可能发生的相变进行比较和分析。完成表面粗糙度实验和相变实验后，用3D体积扫描仪测量打磨器的体积，并与实验前的体积进行比较，以评估打磨系统的耐久性。使用双向方差分析和Tukey诚实显著差异检验（α = 0.05）对所有数据进行统计分析。
两种氧化锆打磨系统（Z1、Z2），无论用于打磨的试件类型如何，都比长石质瓷打磨系统（F1）产生了显著更光滑的表面（P <.001）。当对氧化锆试件进行8分钟的打磨处理时，Z1系统中斜方晶相的最大百分比增加了0.03%，Z2系统中增加了0.09%。打磨系统耐久性评估的体积变化在Z1系统中为13.35%和29.37%，在Z2系统中为2.05%和5.92%，在F1系统中分别为3.60%和4.95%。
氧化锆打磨系统在氧化锆上产生的表面比长石质瓷打磨系统更光滑。打磨前后氧化锆的相变未发现显著变化。每种打磨系统表现出不同程度的耐磨性。
