註釋 This study examined the effect of simulated oral conditions (storage in phosphate-buffered saline (PBS) with bracket-related load deflection at 37±1°C for 12 weeks) on surface-treated and non-surface treated NiTi archwires. Three types of NiTi wires were tested: non-coated NiTi wire, nitrogen-treated NiTi wire, and rhodium-coated NiTi wire. Wire segments from each NiTi wire type underwent surface roughness measurements and friction testing in the as-received condition (control group) and following exposure to a simulated oral environment for 12 weeks (experimental treatment group). A profilometer was used to measure average roughness in three areas of each wire segment. After profilometry, a universal mechanical tester was used for friction testing. Each wire segment was pulled through a bracket in a passive configuration for 5 mm and the minimum, maximum, and mean of the top 10% of the load was calculated. Three representative specimens from each NiTi wire type in each condition were viewed using scanning electron microscopy (SEM) to provide qualitative surface topography analysis. Results of the study showed that all wires stored in simulated oral conditions (PBS at 37±1°C with bracket-related load deflection) were significantly rougher (p 0.05) than their counterparts in the as-received condition. Rhodium-coated wires were found to be significantly rougher (p 