Objectives: We compared the effects of fluoride mouthwashes on surface topography of orthodontic wires, and static and kinetic frictional forces between stainless-steel (SS) orthodontic brackets and SS and nickel-titanium (NiTi) archwires.
Materials and Methods: This in vitro, experimental study evaluated 240 standard SS maxillary central incisor brackets and 0.018-, and 0.025×0.019-inch NiTi and SS archwires. Different combinations of wire diameters and wire types were exposed to artificial saliva (control), 0.05% sodium-fluoride (NaF) for 1 minute daily, or 0.2% NaF for 1 minute weekly (37°C) for 3 months. The wires were pulled in the bracket slots by 5mm in a universal testing machine (10mm/minute). The static and kinetic forces were measured. The surface topography of the wires was inspected under a scanning electron microscope (SEM). Three-way ANOVA followed by Bonferroni post-hoc tests were used for statistical analysis (P<0.05).
Results: The mean static and kinetic frictional forces of 0.025×0.019- inch NiTi wired in the 0.05%NaF group were significantly greater than the SS wire. The mean kinetic frictional force in the 0.05%NaF group was significantly greater than the 0.2%NaF and artificial saliva groups for all wires. The mean static and kinetic forces in 0.2%NaF were significantly greater than in artificial saliva. In all groups, larger wires showed higher mean frictional forces. SEM results revealed higher wire surface roughness in the 0.05%NaF group followed by the 0.2%NaF group.
Conclusion: Weekly use of 0.2%NaF mouthwash is recommended during sliding mechanics to minimize frictional forces between SS and NiTi wires and SS brackets.
Introduction: The placement of an orthodontic separator induces pain and discomfort inpatients. The use of Nsaids for its analgesic effect was along with side effects. The aim of study evaluation of the effect of low power laser therapy on pain reduction and NO level in GCF induced by separator force in orthodontic treatment.
Materials & Methods: This experimental laboratory study was performed on 30 patients in the age range of 15-35 who required placement of the separator on the right maxillary molars. Patients were randomly divided into two groups of laser and placebo. Gingival groove fluid sampling was performed on 0-3-0 days in both groups. Laser irradiation was performed on days 2 and 4, in the placebo group, the device was used off. The amount of pain was recorded by patients with a VAS questionnaire on a daily basis. Data were analyzed by t-test and ANOVA (α = 0.05).
Results: VAS score in laser group was more than placebo group but it wasn’t statistically different (p-value = 0.067), NO level further decrease in laser group compared with placebo group but it wasn’t statistically different (p-value = 0.286).
Conclusion: The effect of low level laser therapy on pain reduction was very low and it wasn’t statistically different.
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