Background
and Objective: In orthodontic treatment,the various alloys are
widely used .These materials are placed in contact with the oral tissues for months or
even years. Microbiological and enzymatic
properties of the oral cavity provide appropriate conditions for metals corrosion, causing the release of elements such as nickel,
chromium, copper and silver from wires,
bands and orthodontic brackets. The purpose of this
study is to measure the amount of
nickel ions released
from the simulated appliance in orthognathic patients and compare the amount of
releasing nickel with its safe level.
Materials
and Methods:
In this semi-experimental study, 60 stimulated appliances in three different
types (groups of 20) were studied. Theses three groups examined by spectophotometer
to measure free nickel in artificial saliva using atomic absorption after 3 ,6 and
2 months respectively and then calculated the rates of three groups, after that
compared to safe nickel’s level. Statistical analysis was done by one sample t-test
Results: The mean and
standard deviation rates of the released nickel in four quadrants of the oral
cavity were 1198±533.45
in first group and 825.5±390.40 and 1290.5±455.47
microgram per picoliter in second and third groups,
respectively .The mean amount of released nickel in all groups were less than the
safe threshold (2500) and statistical analysis showed a significant difference
(p<0.001).
Conclusion: The amount of released nickel in
the whole oral cavity (four quadrants) in each group was less than the toxic
dose so this appliance may be safe.
Key words: Nickel, Orthodontic appliance,
Orthognathic surgery
Funding:
This research
was funded by Rafsanjan University of Medical Sciences.
Conflict
of interest: None
declared
Ethical
approval: The Ethics Committee of Rafsanjan University of Medical Sciences approved the
study with number of 445.
How to cite this article: Sabzevari
B, Abbasi Shaye Z, Vakili V, Vakili K. Assessment the Release of Nickel Ion
from Simulated Orthodontic Appliances for Orthognathic Patients and Comparison
with Safe Level of Nickel. J
RafsanjanUniv Med Sci 2015 14(6): 455-66. [Farsi]
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