الفهرس 
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Abstract
Summary
• The aim of the present study was directed to evaluate the effect of chlorhexidine
and sodium fluoride on corrosion behavior and surface topography of different
orthodontic archwires.
• Sixty orthodontic archwires were selected from the outpatient clinic of the
Department of orthodontics, Faculty of Dentistry, Suez Canal University.
• The selected patients divided randomly into three groups according to the
randomization plan. The distributions of these groups will be as following:
- group 1: (control group) (saliva group) subjects who conducted regular
oral hygiene.
- group 2: (fluoride group) subjects who used fluoride for intensive
prophylaxis.
- group 3: (chlorhexidine group) subjects who used chlorhexidine.
• Scanning electron microscope (SEM) examination of representative samples of
all archwires was conducted using a SEM-QUANTA FEG-250, and highresolution SEM images were analyzed using Image J 1.53t software.
• In this study the results proved that the corrosion at NiTi archwires higher than
SS archwires; anteriorly was more than posteriorly and differences between
these two parts for both archwires were statistically non-significant at Control
and CHX groups but highly significant at NaF group.
• In this study, It was found that there was a statistically significant difference in
corrosion behavior between the control and the two other groups at SS and NiTi
archwires, however there was statistically non-significant difference between
archwires at NaF and CHX groups, but there was statistically highly significant
difference between NaF and control groups.