Two kinds of hydroxyapatite (HA) with different nanocrystal morphology were obtained via a simple aqueous precipitation method under different reactants molar ratios. Under Ca/P molar ratio of 1.67/1, rod-like crystal was produced, while under Ca/P molar ratio of 1.80/1, spherical crystal was produced. The spherical crystal was 40-60 nm in diameter, while the rod-like crystal was 40-55 nm in diameter and 79-100 nm in length. The influence of HA nanocrystal morphology on osteoblasts growth was assayed by MTT method and SEM. The results indicated that there was a significantly higher absorbency value on the surface of HA with spherical crystal in MTT assay than the latter. In the process of SEM observation, it is found that osteoblasts spread out a large quantity of nano-filopodias on spherical crystal surface, thus exhibiting much more active cell morphology. In conclusion, HA with spherical nanocrystal showed more favorable properties than that with rod-like one for osteoblasts.
Objective: The purpose of this study was to evaluate the dentoskeletal and soft tissue profile changes after extraction of two lower first or second premolars in "borderline" adult skeletal Class III cases. Methods: Twenty-eight patients with "borderline" skeletal Class III malocclusion were studied. All of them were treated by extraction of two lower first or second premolars. Lateral cephalometric radiographs taken at the start and end of treatment were analysed. Twenty-five cephalometric variables were calculated and paired t-tests were performed. Results: After treatment, no significant changes were noted in the skeletal parameters (p ≥ 0.05). Regarding the dental parameters, the L1-MP angle decreased by 8.
The aim of this study was to investigate the ozone treating effects on wool scales and wool fabrics mechanical property through experiments and observation. For this purpose, detailed investigations on the role of mechanical properties surfacing topography, changes in component and membrane structure were investigated. Then, a micro explanation was given to discuss the mechanism of wool shrinkage. Because scales are the necessary factor for shrinking, this study is of great significance to the work of shrinkproofing.
The aim of this study was to investigate the water effects on the scales behavior through experiments and observation by SFM and AFM. For this purpose, a detailed investigation on the role of water, PH, and treat time were investigated. After this, a model was built to discuss the swelling and upward of the wet scales. For the scales is the element factor for shrinking, so this study is of great significance to the work of shrinkproofing.
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