The alloy type had a significant effect on surface microhardness (P and, which are related with dynamic recovery and shear deformation. Significant results were further investigated statistically with the Steel-Dwass method for multiple comparisons (α=.05). They were analyzed statistically with the Kruskal-Wallis rank sum test. Data obtained from the castability experiments were non-normal and the variances were unequal. Statistically significant effects were examined further with the Tukey HSD procedure for multiple comparisons. Two-way ANOVA was used to determine significant differences among the main effects. Each group was metallographically prepared for further evaluation that included chemical composition, Vickers microhardness, and grain analysis of microstructure. Each specimen was evaluated for casting completeness to determine a castability value, while porosity was determined by standard x-ray techniques. Similarly, 4 groups were cast in O, JO, G, and L by an inductively induction/vacuum-pressure casting machine. Four groups were torch/ centrifugally cast in Olympia (O), Jelenko O (JO), Genesis II (G), and Liberty (L) alloys. One hundred and twenty castability patterns were fabricated and divided into 8 groups. Two commonly used methods for casting were selected for comparison: torch/ centrifugal casting and inductively heated/ vacuum-pressure casting. The purpose of this study was to evaluate how torch/ centrifugal and inductively cast and vacuum-pressure casting machines may affect the castability, microhardness, chemical composition, and microstructure of 2 high noble, 1 noble, and 1 base metal dental casting alloys. It is important to consider clinically important mechanical properties so that the influence of casting can be clarified. Previous studies have shown casting methodology to influence the as- cast properties of dental casting alloys. Thompson, Geoffrey A Luo, Qing Hefti, Arthur With improved filling, preheat and pour temperatures reduced and solidification hastened so less hot tearing.Īnalysis of four dental alloys following torch/ centrifugal and induction/ vacuum-pressure casting procedures. Centrifugal force drives molten metal into thin trailing edges, ensuring they are filled. Investment mold spun for short time while being filled, and stopped before solidification occurs. Used to make first- and second-stage high-pressure-fuel-turbopump nozzles, containing vanes with thin trailing edges and other thin sections. Modifications, including incorporation of centrifugal casting, made in investment- casting process reducing scrap rate.
© 2015 Wiley Periodicals, Inc.Ĭombination Of Investment And Centrifugal Casting Therefore, our results suggest that this new fabrication process for silk fibroin films offers important potential benefits for corneal tissue regeneration. Furthermore, primary human corneal keratocytes grew better in films prepared by the centrifugal casting. For elasticity and transparency, silk fibroin films obtained from the centrifugal casting had favorable results compared with those prepared by dry casting. In terms of surface morphology, films fabricated by the centrifugal casting have less surface roughness than those by the dry casting. In the present study, we also compared the surface roughness, mechanical properties, transparency, and cell proliferation between centrifugal and dry casting method. In contrast to the conventional dry casting method, we carried out the new process in a centrifuge with a rotating speed of 4000 rpm, where centrifugal force was imposed on an aluminum tube containing silk fibroin solution. In this work, fabrication of silk fibroin films was simply achieved by centrifugal force. Here, we present a novel process for fabrication of silk fibroin films for corneal application. Lee, Min Chae Kim, Dong-Kyu Lee, Ok Joo Kim, Jung-Ho Ju, Hyung Woo Lee, Jung Min Moon, Bo Mi Park, Hyun Jung Kim, Dong Wook Kim, Su Hyeon Park, Chan Humįilms prepared from silk fibroin have shown potential as biomaterials in tissue engineering applications for the eye.
Fabrication of silk fibroin film using centrifugal casting technique for corneal tissue engineering.
0 kommentar(er)
