关键词: 摩擦力, 电镜扫描, 表面结构, 体外实验, 不锈钢弓丝

Abstract:

Objective    To observe the change of the surface structure of the arch wire due to different orthodontic bracket designs and ligations. Methods    In the dry environment the sliding of bracket  on the arch wire was simulated，and WDW20 & 0.5 electronic universal testing machine was used to provide uniform traction；the arch wire was scanned with SEM. Results    The wires investigated in this study had varying degrees of change；the MLF bracket with 0.2 mm ligation group had minimal changes to the arch wire surface. The scratches of arch wire surface distributed evenly on elastic ligation ring group；0.25 mm ligature wire was likely to cause the uneven distribution of stress. Conclusion    The different ways of ligation have different effects on morphological structure of the surface of the arch wire. The coarser ligature wires have bigger influence on the arch wire surface structure. Different orthodontic bracket designs will change the arch wire surface structure.

Key words: friction, scanning electron microscope, surface, in vitro, stainless steel orthodontic wire