Abstract
Aims: The aims of the this study were to measure the effect of
chlorhexidine and fluoridated mouth wash on mechanical
properties of stainless steel and nickel titanium wires and to
study the effect of three time intervals (3, 7, and 10 days)
immersion on these mechanical properties. Materials and
Methods: Two types of orthodontic wires were taken which
included stainless steel and superelastic nickel titanium wires
(Dentaurum, Germany). The 0.016×0.016 inch wires were
selected. Each type of wires divided into seven groups; control
group and six experimental groups in which the wires
immersed in the chlorhexidine and fluoridated mouth wash for
3, 7, and 10 days and then the mechanical properties of wires
(yield stress, ultimate tensile stress, modulus of elasticity)
measured by using the universal tensile testing machine.
Results: The results of the present study showed that a
significant difference in the mechanical properties of both
stainless steel and nickel titanium wires between the control
group and experimental groups immersed in the fluoridated
mouth wash and this decreased in the mechanical properties as
immersion time increased. Also the results of the present
study showed that a non significant difference in the
mechanical properties of both stainless steel and nickel
titanium wires between the control group and experimental
groups immersed in the chlorhexidine mouth wash.
Conclusions: The results of the present study indicated that
the fluoridated mouth wash decreased the mechanical
properties of stainless steel and nickel titanium wires and this
degradation in mechanical properties could contributed to
prolong orthodontic treatment. While the chlorhexidine has no
effect on mechanical properties of stainless steel and nickel
titanium wires.
