Evaluation of the effect of different beverages on the mechanical properties of orthodontic arch wires

Abstract

Purpose: This study was conducted to evaluate the effect of different beverages on surface microhardness, modulus of elasticity and flexural strength of orthodontic archwires. Materials and Methods: Four orthodontic archwires (stainless steel, NiTi, copper NiTi and Teflon-coated NiTi) were used. They were immersed in three different solutions (Artificial saliva, tea and Coca Cola) for four weeks. For mechanical properties assessment, the specimens were classified mainly into four groups (90 specimens each) according to the archwire type. Each group was further subdivided into 3 subgroups (30 specimens each) according to the used solution. Each subgroup had been divided into three divisions (10 specimens each) according to the test parameter (surface microhardness, modulus of elasticity, flexural strength). Surface microhardness was evaluated using Vickers hardness tester. While modulus of elasticity and flexural strength were measured by subjecting the archwires specimens to the three point bending test using a universal testing machine. Means and standard deviations were calculated for all tests. The data was analyzed and compared using two-way ANOVA analysis and Least Significant Difference (LSD) test (p < 0.05). Results: Artificial saliva significantly decreased the surface microhardness of St. St. and Teflon-coated NiTi archwires and significantly decreased the modulus of elasticity of NiTi, CuNiTi, St. St. archwires. Tea and Coca Cola significantly decreased the surface microhardness of CuNiTi, St. St. and Teflon-coated NiTi archwires and significantly decreased the modulus of elasticity of all archwire specimens. Two-way ANOVA results revealed significant difference among the tested groups (p < 0.001). Conclusions: Tea and Coca Cola potentially would contribute to the change in the mechanical properties of orthodontic archwires leading to prolonged orthodontic treatment.

Effect of Different Beverages on the Elastic Properties of NiTi Orthodontic Wires: An In-Vitro Study

“…In the present study, the control group always exhibited better mechanical properties. These ndings are in agreement with similar reports in previous studies when NiTi archwires were exposed to various drinks, mouthwashes, gastric juices or even saliva [9][10][11][12][13][14][15]. Hafez evaluated the effect of different solutions (arti cial saliva, tea, and Coca-Cola) on modulus of elasticity and exural strength of orthodontic archwires.…”

“…They reported a signi cant reduction in the modulus of elasticity of all archwire specimens after their immersion. It was concluded that Tea and Coca-Cola could potentially change the mechanical properties of orthodontic archwires leading to prolonged orthodontic treatment [9].…”

Nickel and Chromium Ion Release from Orthodontic Wires Subjected to Various Drinks and Distilled Water

“…Acidic foods and drinks not only damage enamel but also shorten the lifetime of dental repairs [ 5 ]. These drinks weaken the surface hardness, surface integrity, and solubility of the substances and lead to metal corrosion [ 6 , 7 ].…”