Contact lenses are being used by more than 125 million people around the world for ophthalmic treatments. There has been a recent surge in interest in researching and developing new materials for contact lenses (CLs). With the advancement of associated biomaterials, such as drug delivery, these materials will continue to grow in importance in the future. If you're looking to buy contact lenses, you'll most likely find them made out of polymer or silicone hydrogel. To meet the ever-increasing needs for contact lenses and the ever-increasing number of contact lens users, this work aims to study the effect of adding aloe Vera gel to contact lenses, antibacterial behavior, surface texture, and wettability. Results show the addition of aloe Vera natural materials to rigid PMMA contact lenses aid to promote the performance of contact lenses by changing the internal structure of PMMA, especially when using (0.1%, 0.2%, and 0.3%) of aloe Vera due to the increasing in OH content as well as the increasing in the uniformity of microstructure. addition of (0.4% and 0.5 %) of aloe Vera make a reverse effect on the structure due to the saturation of PMMA chain with OH leading to destroying the connections between bonds, therefore, weakening PMMA lenses also using aloe Vera gel act to soften the lenses by increasing the OH content in PMMA structure lead to improving the lens wettability at about (0.2-0.3) % after these percentage large drop in whole properties will occur. Keywords: Rigid contact lens, PMMA, natural materials, Aloe Vera, OH content.
Mg is a biodegradable metal that possesses excellent biocompatibility, bioactivity, nontoxic degradation products, and unique mechanical properties. These characteristics make it an attractive element to be used as implant material in physiological environments because it biodegrades and has excellent biocompatibility and bioactivity. In addition, an excess of magnesium ions does not result in cellular toxicity in the human body, where it is often getting rid along with urine. The most significant disadvantage of magnesium is its uncontrolled quick corrosion rate, which can cause rapid loss in mechanical qualities. As a consequence, this might cause the implant to fail before the tissue has completely healed.The purpose of this research is to improve the surface features of the implant, as well as to control the rate at which magnesium corrodes and, as a result, the concentration of magnesium ions that are released into the surrounding environment. This will be accomplished by coating the implant surface with a composite biodegradable polymer (Polycaprolactone PCL) matrix reinforced with MgO Nano-particles which will act as a protective layer to increase the corrosion resistance of magnesium implants. In addition, a laser surface modification procedure was implemented in order to improve the surface's qualities and make certain that there is a strong adhesion between the coating and the surface of the substrate. In order to increase the surface roughness of the specimen, (Nd: YAG) laser device was utilized to create pulses on the surface of the specimen.
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