Abstract
Aims: To evaluate and compare the value of the mechanical properties of the extra hard spring stainless steel arch wire immersed in artificial saliva. Materials and Methods: The sample consisted of 40 extra hard spring stainless steel arch wires (Remanium, 0.016″ × 0.016″, Dentarum, Germany) divided into; control wires group and experimental group (ten wires for each group). The experimental group was immersed in artificial saliva (PH 6.75+ 0.015) ) and incubated at 37 for one, two and four weeks respectively. The curve of tensile strength for the control and experimental groups was performed using the tensile testing machine. The mechanical properties of the arch wire have been derived. The results were analyzed using the statistics of descriptive, Anova and Duncan’s Multiple Range Analysis tests. Results: The results showed that the mechanical properties (ultimate tensile strength, elastic modulus, springiness (springback) ,elastic limit, plastic limit (ductility) of the extra spring hard stainless steel arch wire significantly decrease as the immersion time in artificial saliva increase when compared with the control group. Conclusions: It is recommended not utilize the extra spring hard stainless steel arch wire for long periods during orthodontic treatments.
Highlights
Hibbeler [1] defined the mechanic of material as the study of the relationship between the external loads applied to a deformable body and the intensity of the internal force acting within the body.Changes in the field of mechanotherapy have largely been made possible with the emergence of new orthodontic materials; arch wire materials formed a large part of these changes
The aims of this study are to compare the mechanical properties of the extra spring hard stainless steel arch wire; which were subjected to artificial saliva for one week, two weeks and one month
The mechanical properties of the extra spring hard stainless steel arch wire groups which were immersed in artificial saliva for one, two and four weeks disclosed significant less values as compared with the control wire group
Summary
Hibbeler [1] defined the mechanic of material as the study of the relationship between the external loads applied to a deformable body and the intensity of the internal force acting within the body.Changes in the field of mechanotherapy have largely been made possible with the emergence of new orthodontic materials; arch wire materials formed a large part of these changes. The important mechanical properties of the orthodontic arch wires include: Yield stress [3], ultimate tensile strength [4], springiness (springback) [5], elastic limit [6], plastic limit (ductility) [7]. Understanding the basic material characteristics became essential for selecting wires for use in the treatment [8]. Changes in the mechanical properties of orthodontic alloy were studied in a simulated oral environment across time [9]. The aims of this study are to compare the mechanical properties of the extra spring hard stainless steel arch wire; which were subjected to artificial saliva for one week, two weeks and one month
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