SILVIA-IZABELLA POP, MIRCEA DUDESCU, DANA CRISTINA BRATU3, RADU-VASILE POP, MARIUS PETRISOR, MARIANA PACURAR<br>Influence of the Chemical Composition on the Mechanical <br>Properties of Orthodontic Archwires

SILVIA-IZABELLA POP, MIRCEA DUDESCU, DANA CRISTINA BRATU3, RADU-VASILE POP, MARIUS PETRISOR, MARIANA PACURAR
Influence of the Chemical Composition on the Mechanical
Properties of Orthodontic Archwires

Abstract:

This study was undertaken to evaluate the difference between the main mechanical properties (ultimate tensile strength (UTS), yield strength (YS), modulus of elasticity (E) and the load deflection characteristics of the stainless steel (SS) and nickel titanium (NiTi) orthodontic archwires. Forty archwires (20 NiTi and 20 SS) of two cross-sectional diameters (0.016 inch and 0.016x0.022 inch) were obtained from a single manufacturer. Tensile tests and three-point bending tests were performed on five samples of each type of archwire. Mann-Whitney test, level of significance p[0.05 was used to statistically analyzed the results. Statistical analysis was performed using GraphPad Prism 5.0 for Windows. The values obtained through tensile testing of the 2 archwire groups indicated superior strength for Stainless steel (group I) followed by Ni-TI (group II). The load deflection values obtained through three-point bend testing of wire specimens from groups I and II were highly significant for the rectangular wires. Statistically insignificant differences of the round section wires’ deflection value were observed. It is evident from the data that stainless steel with high values for yield strength remains a mainstay in fixed orthodontic therapy. The rectangular NiTi archwire, appears to be kinder to the dento-alveolar tissues by generating low, consistent force, when compared to the rectangular SS alloy for load deflection characteristics. Keywords: orthodontic archwire, stainless steel, nickel-titanium, modulus of elasticity

Issue: 2013, Volume 64, Issue 7

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