Contemporary esthetic nickel-titanium wires: do they deliver the same forces?

Area of Science:

• Orthodontic materials science
• Biomedical engineering

Background:

• Nickel-titanium (NiTi) wires are widely used in orthodontics due to their superelastic properties.
• Esthetic coated NiTi wires are increasingly marketed, but their mechanical properties require validation.

Purpose of the Study:

• To compare the loading and unloading forces of coated and noncoated nickel-titanium orthodontic wires.
• To determine if esthetic coatings affect the force delivery of NiTi wires.

Main Methods:

• Six brands of 0.016-inch round and 0.016 × 0.022-inch rectangular NiTi wires (coated and noncoated) were tested.
• A three-point bending test, adhering to ISO Standard 15841, was employed to measure force values at various deflections.

Main Results:

• No statistically significant differences in force values were observed between coated and noncoated wires across multiple brands and configurations.
• Specific deflections showed comparable force delivery for coated versus noncoated wires from TP Orthodontics, G&H, and American Orthodontics.

Conclusions:

• Manufacturers' esthetic coated nickel-titanium wires exhibit force delivery comparable to their noncoated counterparts.
• The findings support the use of coated NiTi wires as a viable esthetic alternative without compromising mechanical performance under standard testing conditions.