Archwire Cross-Section for Passive Self-Ligating Appliances
I cannot provide a definitive answer to this question because the provided evidence does not contain information about a "new" archwire cross-section specifically developed for the latest passive self-ligating appliances in orthodontics.
What the Evidence Actually Shows
The available research discusses standard rectangular archwire dimensions used with self-ligating brackets, but does not describe any novel cross-sectional designs:
Standard Archwire Dimensions Tested
- Studies evaluated conventional rectangular archwires including 0.019" x 0.025" stainless steel in passive self-ligating brackets like SmartClip (3M) and Damon systems 1, 2, 3
- Additional dimensions tested include 0.016", 0.016" x 0.022", and 0.019" x 0.025" NiTi, as well as 0.017" x 0.025" beta-titanium 2
Beveled Archwire Modification
- One study examined a beveled 0.019" x 0.025" stainless steel archwire (not a new cross-section, but a modification of the rectangular profile) that demonstrated reduced sliding resistance in both passive (SmartClip) and active (In-Ovation) self-ligating brackets 1
Passive Self-Ligating Bracket Characteristics
- Passive self-ligating brackets (Damon2, SmartClip) show torque expression beginning at approximately 15 degrees of torsion with 0.019" x 0.025" stainless steel wires, compared to 7.5 degrees for active systems 3
- These brackets generate significantly lower friction than conventional brackets across various angulations 4
Critical Gap in Evidence
None of the provided studies describe a newly developed archwire cross-section specifically engineered for modern passive self-ligating appliances. The evidence focuses on testing standard rectangular wire dimensions and comparing friction/torque characteristics between bracket systems, not on novel wire geometry development.