Relative stiffness of beta titanium archwires

Area of Science:

• Orthodontics
• Materials Science

Background:

• The market for beta titanium (TMA type) wires has expanded, with new square and rectangular sizes becoming available.
• Variations in wire properties among manufacturers may affect clinical outcomes.

Purpose of the Study:

• To evaluate the stiffness of beta titanium wires from various vendors.
• To compare the stiffness of different wire sizes and shapes.
• To discuss the clinical implications of beta titanium wire properties for orthodontic treatment.

Main Methods:

• 34 beta titanium wire samples of various sizes were tested for stiffness.
• Testing was performed using the American Dental Association (ADA) three-point wire-testing jig.
• Variations in stiffness and standard deviation were analyzed across vendors and wire sizes.

Main Results:

• Significant variations in stiffness were observed among beta titanium wires, dependent on nominal wire size.
• Vendor-to-vendor variation in average stiffness standard deviation ranged from 1.67% to 4.27%.
• New square and rectangular sizes offer potential for enhanced torque control in orthodontic applications.

Conclusions:

• Not all beta titanium wires exhibit uniform stiffness; significant variability exists between manufacturers and sizes.
• The findings suggest a need for clinicians to be aware of these material property differences when selecting wires for orthodontic treatment.
• Beta titanium wires, particularly new rectangular sizes, present viable alternatives to stainless steel wires for specific treatment stages, including torque application.