One key aspect of reconstructive and plastic surgery relates the process of preparing the corresponding donor sites and the actual process of splitting the skin. Split-thickness grafts are used to cover large areas, and feature a low rejection rate 2. Skin grafts can be categorized as split-thickness and full-thickness. This approach to wound coverage has greatly advanced since that time, and is now considered a safe, reliable, and practical procedure. Reverdin succeeded in applying epidermal grafts to a granulating wound 1. This technique is commonly employed when skin is damaged due to extensive trauma, such as burns. Skin grafts involve the removal of skin from one area of the body for transplantation in another area of the body. This is a clear demonstration of the efficacy of TFMG surface coatings in preserving the cutting quality of surgical instruments. By Day 7, the wounds produced using TFMG-coated blades were noticeably smaller than those produced using uncoated blades, and these effects were particularly evident in hairy samples. ![]() In the presence of hair, the surface roughness of uncoated blades increased by approximately ~108%, whereas the surface roughness of TFMG-coated blades increases by only ~23%. When tested repeatedly on hairless skin, the surface roughness of uncoated blades increased by approximately 70%, whereas the surface roughness of TFMG-coated blades increases by only 8.6%. The performance of Z-TFMG and F-TFMG was also evaluated in split-thickness skin graft surgery using dermatome blades aimed at elucidating the influence of TFMG coatings on the healing of surgical incisions. These results demonstrate the efficacy of the TFMG coating in terms of low friction, non-stick performance, and substrate adhesion. The Z-TFMG presented no indications of delamination after being used 30 times for cutting however, the Teflon coating proved highly susceptible to peeling and the bare blade was affected by surface staining. We also found that the Teflon coating reduced the cutting forces of an uncoated microtome blade by ~80%, whereas the proposed Z-TFMG achieved a ~51% reduction. Comparisons were conducted with bare blades and those with a Teflon coating (a low-friction material commonly used for the coating of microtome blades). In oil-repellency/sliding tests on kitchen blades, the sliding angle and friction forces were as follows: bare blades (31.6°) and (35 µN), Ti-coated blades (20.3°) and (23.7 µN), and Z-TFMG coated blades (16.2°) and (19.2 µN). it is found in volcanic areas or areas were volcanism has occurred sometime in Earth’s history.In this study, we sought to enhance the cutting properties of the various blades by coating them with Zr- and Fe-based thin film metallic glasses (TFMGs) to a thickness of 234–255 nm via sputter deposition. The fine-grain is due to quick cooling magma. Obsidian under the microscope showing a complex fine-grained texture. Another benefit to using obsidian scalpels is the reduction of healing time for surgical incisions. Given these unique characteristics a German company has created surgical tools that allow doctors to use obsidian instruments on patients who might be allergic to steel. It is 3 times sharper than diamond and between 500-1000 times sharper than a razor or a surgeon’s steel blade resulting in easier incisions and fewer microscopic ragged tissue cuts. Surprisingly, the edge of a piece of obsidian is superior to that of a surgeon’s steel scalpel. ![]() Because of its sharp edges early man used it to make cutting tools or arrowheads. Obsidian has a conchoidal (shell-like pattern) fracture, which means that it breaks like glass and does not form any flat crystal facets. ![]() Obsidian is considered more of an igneous rock than a mineral, since glass does not have the crystal structure that defines minerals. Obsidian hand sample showing the glassy texture. The result is a silicon dioxide glass with magnesium and iron to give it the dark color. Obsidian is a volcanic glass created when magma is extruded from a volcano and quickly becomes quenched (cooled) so that crystals have almost no time to grow. Today’s featured rock/mineral piece is on: Obsidian.
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