Orthodontic Alloy Wires and Their Hypoallergenic Alternatives: Metal Ions Release in pH 6.6 and pH 5.5 Artificial Saliva.

Legislative framework addresses the issues of alloy corrosion, demanding the restricted use of probable carcinogenic, mutagenic, and toxic-for-human-reproduction (CMG) metals like nickel, cobalt, and chromium and demanding the development of new biomaterials. The aim of this research was to evaluate and compare the ion release of standard dental alloys and their hypoallergenic equivalents. Six types of orthodontic alloy wires (nickel-titanium (NiTi), coated NiTi, stainless steel (SS), Ni-free SS, and cobalt-chromium (CoCr) and titanium-molybdenum (TMA) were immersed into artificial saliva of pH 5.

Microstructure-mechanical properties of Ag/Au doped K-Mg-Al-Si-O-F glass-ceramics.

In understanding the catalytic efficacy of silver (Ag) and gold (Au) nanoparticles (NPs) on glass-ceramic (GC) crystallization, the microstructure-machinability correlation of a SiO-MgO-AlO-BO-KO-MgF system is studied. The thermal parameters , glass transition temperature ( ) and crystallization temperature ( ) were extensively changed by varying NPs ( or ). Tc was found to be increased ( = 870-875 °C) by 90-110 °C when NPs were present in the glass system.