In this work, the microstructure, mechanical properties, and corrosion behavior of the Mg-1Zn-0.6Ca matrix alloy (ZX10), reinforced by adding various amounts of nanodiamond particles (0.5, 1, and 2 wt.%), prepared by the ultrasound-assisted stir-casting method, were investigated as they are deemed as potential implant materials in biomedical applications. Microstructure, nanoindentation, mechanical tensile, immersion, and potentiodynamic polarization tests were performed for evaluating the influence of the addition of nanodiamond particles on the alloy’s mechanical and biocorrosion properties. The results revealed that the addition of nanodiamond particles causes a reduction in the alloy’s grain size. The alloy’s nanohardness and elastic modulus values increased when the amount of added nanodiamond particles were increased. The nanocomposite with an addition of 0.5% ND showed the best composition with regard to an acceptable corrosion rate as the corrosion rates are too high with higher additions of 1 or 2% NDs. At the same time, the yield strength, tensile strength, and elongation improved slightly compared to the matrix alloy.

Titanium-based alloys are used in orthopedic applications as fixation elements, hard tissue replacements in artificial bones, and dental implants. Despite their wide range of applications, metallic implant defects and failures arise due to inadequate mechanical bonding, postoperative clotting problems, aseptic loosening, and infections. To improve the surface bioactivity and reduce the corrosion rate of the Ti6Al4V alloy, multi-layered coatings (HAp, BG, Cs, and Hep) were applied via electrophoretic deposition (EPD). XRD images showed the presence of HAp within the coating. In vitro investigation: cell line NIH-3T3 fibroblasts were seeded on the non-coated and coated Ti6Al4V substrates, and their cellular behavior was evaluated. The results indicated that the HApBGCsHep coating could enhance the adhesion and proliferation of NIH 3T3 cells. In addition, the potentiodynamic polarization results are compatible with the in vitro outcome.

Zn alaşımları sahip oldukları yüksek biyouyumluluk, nispeten yavaş (biyobozunur Mg ve Fe’ye göre) bozunma hızı ve yüksek mukavemetleri nedeniyle son zamanlarda biyobozunur malzeme arayışında dikkat çekmeye başlamıştır. Özellikle farklı elementler ile alaşımlama yapılarak Zn esaslı alaşımların mekanik ve korozyon özellikleri incelenmektedir. Bu çalışma Zn-%1 Mg alaşımı manyetik alan altında gravite (yerçekimi) döküm, manyetik alansız gravite döküm ve soğuk kamaralı basınçlı döküm yöntemi olmak üzere 3 farklı döküm yöntemiyle üretilerek mikroyapı, mekanik ve korozyon özellikleri karşılaştırılmıştır. Her üç döküm yönteminde de Zn dendritik matris fazının ve Mg2Zn11 ötektik karışımın oluştuğu tespit edilmiştir. Katılaşma anında manyetik alan uygulanmasının dendritik matrisi ve ötektik karışımı incelttiği ettiği görülmüştür. Gravite dökümde katılaşma anında manyetik alan uygulanmasının Zn-Mg alaşımının mekanik ve korozyon özelliklerini geliştirdiği görülmüştür. En yüksek Vickers sertlik değeri yüksek basınçlı döküm yöntemi ile elde edilirken en iyi korozyon hızı manyetik alan altında gerçekleştirilen gravite döküm numunesinde elde edilmiştir.

Purpose: The aims of this study were to compare the mechanical properties of piezo-surgical tips such as nano-hardness, elastic modulus, surface roughness, and wear level, and to measure their cutting performance. Materials and Methods: In this study, 31 piezo-surgical tips were used, three for control and 28 for testing. The testing tips were equally divided into four groups with different numbers of osteotomies: the four-, 8-, 16-, and 32-osteotomy groups. The mean osteotomy duration was recorded during osteotomy. Scanning electron microscopy images of the tips in the test groups were obtained before and after osteotomy, and the wear level of the tips was measured. Results: A statistically significant increase was observed in the nano-hardness of the piezo-surgical tips depending on the number of osteotomy (for 4-use; 22.47±1.67H and for 32-use; 28.49±3.42H). The elasticity value of the testing tips was in the range of 218.55±15.74E to 241.26±10.46E, and all of the values were significantly higher than those in the control group (174.39±13.53E). As the frequency of use increased, a significant increase in surface roughness was observed (from 16.67±1.50 to 56.12±2.60). A positive correlation was found between the frequency of use and the wear level of the tips, and between the surface roughness and wear level of the tips. Conclusion: With the increase in the number of osteotomies, significant changes in the mechanical and physical properties of the piezo-surgical tips that affected their bone-cutting performance were observed.