Tuna Taskin, Wein Martin, Swain Michael, Fischer Jens, Att Wael
Department of Prosthodontics, School of Dentistry, Albert-Ludwigs University of Freiburg, Germany.
Department of Oral Biotechnology, School of Dentistry, Albert-Ludwigs University of Freiburg, Germany.
Dent Mater. 2015 Feb;31(2):e14-24. doi: 10.1016/j.dental.2014.10.008. Epub 2014 Nov 22.
To examine the effect of ultraviolet light (UV) treatment on the surface characteristics of two acid-etched zirconia-based dental implant materials.
Discs of two zirconia-based materials (Zr1 and Zr2) with smooth (m) and roughened (r) surfaces were treated by UV light for 15min. The surface topography was investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The surface elemental composition of all samples was determined by X-ray photoelectron spectroscopy (XPS), the crystalline property by X-ray diffraction (XRD) and the hydrophilic status by contact angle (CA) measurements of a water droplet.
SEM and AFM revealed quantitative and qualitative differences between the roughened and smooth surfaces. UV treatment did not induce any topographic changes of the tested surfaces (p>0.05). All UV-treated samples showed a significant surface elemental content change with a decrease of carbon by 43-81%, an increase of oxygen by 19-45%, and an increase of zirconia by 9-41%. Upon UV treatment, a 19-25% increase of the crystalline monoclinic phase was observed on surfaces of material Zr1, whereas a slight increase on the smooth Zr2 surface (+3%) and a decrease on the roughened Zr2 surface by 20% was observed. For all samples, the hydrophilic status changed significantly from hydrophobic to hydrophilic by UV treatment (p<0.0001). The average contact angles were between 56.4° and 69° before and 2.5° and 14.1° after UV-light treatment.
UV treatment altered the physicochemical properties of the two zirconia implant surfaces investigated. The mechanism by which such changes are induced requires further investigation.
研究紫外线（UV）处理对两种酸蚀氧化锆基牙科种植材料表面特性的影响。
对两种具有光滑（m）和粗糙（r）表面的氧化锆基材料（Zr1和Zr2）圆盘进行15分钟的紫外线处理。通过扫描电子显微镜（SEM）和原子力显微镜（AFM）研究表面形貌。通过X射线光电子能谱（XPS）测定所有样品的表面元素组成，通过X射线衍射（XRD）测定晶体性能，并通过测量水滴的接触角（CA）来测定亲水性状态。
SEM和AFM揭示了粗糙表面和光滑表面之间的定量和定性差异。紫外线处理未引起测试表面的任何形貌变化（p>0.05）。所有经紫外线处理的样品均显示表面元素含量有显著变化，碳含量降低43-81%，氧含量增加19-45%，氧化锆含量增加9-41%。经紫外线处理后，材料Zr1表面的晶体单斜相增加了19-25%，而光滑Zr2表面略有增加（+3%），粗糙Zr2表面减少了20%。对于所有样品，紫外线处理后亲水性状态从疏水性显著变为亲水性（p<0.0001）。紫外线处理前平均接触角在56.4°至69°之间，处理后在2.5°至14.1°之间。
紫外线处理改变了所研究的两种氧化锆种植体表面的物理化学性质。诱导这种变化的机制需要进一步研究。
