Khalaf Salah, Ariffin Zaihan, Husein Adam, Reza Fazal
Prosthodontics Unit, Faculty of Dentistry, Universiti Sains Malaysia, Kelantan, Malaysia.
Prosthodontics Unit, University of Anbar, Anbar, Iraq.
J Prosthodont. 2015 Jul;24(5):419-23. doi: 10.1111/jopr.12213. Epub 2014 Sep 14.
This study aimed to compare the surface roughness of maxillofacial silicone elastomers fabricated in noncoated and coated gypsum materials. This study was also conducted to characterize the silicone elastomer specimens after surfaces were modified.
A gypsum mold was coated with clear acrylic spray. The coated mold was then used to produce modified silicone experimental specimens (n = 35). The surface roughness of the modified silicone elastomers was compared with that of the control specimens, which were prepared by conventional flasking methods (n = 35). An atomic force microscope (AFM) was used for surface roughness measurement of silicone elastomer (unmodified and modified), and a scanning electron microscope (SEM) was used to evaluate the topographic conditions of coated and noncoated gypsum and silicone elastomer specimens (unmodified and modified) groups. After the gypsum molds were characterized, the fabricated silicone elastomers molded on noncoated and coated gypsum materials were evaluated further. Energy-dispersive X-ray spectroscopy (EDX) analysis of gypsum materials (noncoated and coated) and silicone elastomer specimens (unmodified and modified) was performed to evaluate the elemental changes after coating was conducted. Independent t test was used to analyze the differences in the surface roughness of unmodified and modified silicone at a significance level of p < 0.05.
Roughness was significantly reduced in the silicone elastomers processed against coated gypsum materials (p < 0.001). The AFM and SEM analysis results showed evident differences in surface smoothness. EDX data further revealed the presence of the desired chemical components on the surface layer of unmodified and modified silicone elastomers.
Silicone elastomers with lower surface roughness of maxillofacial prostheses can be obtained simply by coating a gypsum mold.
本研究旨在比较在未涂层和涂层石膏材料中制作的颌面硅橡胶弹性体的表面粗糙度。本研究还对表面改性后的硅橡胶弹性体试样进行了表征。
用透明丙烯酸喷雾对石膏模具进行涂层处理。然后使用该涂层模具制作改性硅橡胶实验试样（n = 35）。将改性硅橡胶弹性体的表面粗糙度与通过传统装盒方法制备的对照试样（n = 35）进行比较。使用原子力显微镜（AFM）测量硅橡胶弹性体（未改性和改性）的表面粗糙度，并使用扫描电子显微镜（SEM）评估未涂层和涂层石膏以及硅橡胶弹性体试样（未改性和改性）组的形貌条件。在对石膏模具进行表征后，进一步评估在未涂层和涂层石膏材料上模制的硅橡胶弹性体。对石膏材料（未涂层和涂层）以及硅橡胶弹性体试样（未改性和改性）进行能量色散X射线光谱（EDX）分析，以评估涂层处理后的元素变化。使用独立t检验分析未改性和改性硅橡胶表面粗糙度的差异，显著性水平为p < 0.05。
与涂层石膏材料加工的硅橡胶弹性体相比，粗糙度显著降低（p < 0.001）。AFM和SEM分析结果显示表面光滑度存在明显差异。EDX数据进一步揭示了未改性和改性硅橡胶弹性体表面层中存在所需的化学成分。
只需对石膏模具进行涂层处理，即可获得颌面假体表面粗糙度较低的硅橡胶弹性体。
