The orthodontic kinetic release of metal ions was studied in order to have a conclusive in vivo data for variation of metal ion concentrations with time (month) at normal oral temperature 37°C, which affects the saliva quality and quantity, pH, and chemical and physical characteristics of food and liquid. The superficial breakdown and release of metals from the alloy brackets were investigated by scanning electron microscopy (SEM) and energy dispersive X-Ray spectroscopy (EDS) images. The kinetic release experiment of the metal ion concentrations (nickel, chromium, titanium, iron, and copper) in the saliva uptakes follows a pseudo-second-order kinetic model; the release rate of metal ions was in series Fe²⁺ > Ti²⁺ > Ni²⁺ > Cu²⁺ > Cr³⁺, and the highest saliva pH and flow rate were detected after 1 month for fixed orthodontics appliance was (7.16 ± 0.55) and (0.88 ± 0.55) respectively.

研究金属离子的正畸动力学释放，以获得在正常口腔温度37°C下金属离子浓度随时间（月）变化的结论性体内数据，这会影响唾液的质量和数量、pH值以及化学和化学性质。食物和液体的物理特性。通过扫描电子显微镜 (SEM) 和能量色散 X 射线光谱 (EDS) 图像研究了合金支架中金属的表面分解和释放。唾液摄取中金属离子浓度（镍、铬、钛、铁、铜）的动力学释放实验遵循准二级动力学模型；金属离子的释放速率为Fe ²⁺ > Ti ²⁺ > Ni ²⁺ > Cu ²⁺ > Cr³⁺，固定正畸矫治器1个月后唾液pH和流速最高分别为（7.16±0.55）和（0.88±0.55）。