ClearCorrect’s Performance Trimline, scientifically proven ClearControl clinical features, and custom manufacturing technology and processes result in an aligner that delivers greater control and consistent force application to achieve complex movements more predictably.
ClearCorrect's trimline is a smooth, unscalloped, high and flat trimline that extends 1.5 mm ± 0.5 mm above the gingival margin. With the high and flat trimline, ClearCorrect aligners have been scientifically proven to optimize force transmission for more accurate tooth movement and enhanced root control*.
The effect of the trimline design of orthodontic aligners on force transmission was evaluated in a 2022 publication. The study concluded that the forces transmitted to the middle and cervical areas of the tooth with the high and flat trimline, were significantly higher and closer to the center of resistance, potentially improving control of bodily movement.
The scalloped trimline design was shown to be more flexible, reducing the amount of force applied to the tooth near the gingival area, required for a controlled tooth movement.
| High and flat | |
| Scalloped |
Representative superimposition to understand the stress distribution areas over the upper right central incisor, using different trimming line designs. Adapted from: Elshazly, T. et al. Effect of Trimming Line Design and Edge Extension of Orthodontic Aligners on Force Transmission: An in vitro Study. Journal of Dentistry (2022). doi: https://doi.org/10.1016/j.jdent.2022.104276
In addition, it has been proven that aligners with a trimline design that extends above the gingival margin, are up to 2.5x more retentive than scalloped aligners, which can reduce the need for retentive engagers**. In a 2012 study, doctors from the University of Nevada compared the retentive strength of three trimming techniques:
A) a scalloped margin
B) a straight cut at the gingival zenith (Low Trimline)
C) a straight cut at 2 mm above the gingival zenith (High and Flat Trimline)
The difference between the trimlines was remarkable. For clear aligners without engagers, the high and flat trimline was about twice as retentive as the scalloped cut. For clear aligners with engagers, the high and flat trimline was over four times as retentive as the scalloped cut.
In summary, fewer engagers mean better esthetics and less visibility, which means happier patients.
Lastly, ClearCorrect’s custom manufacturing process improves tooth surface contact for optimized force distribution and accurate tooth movement***.
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*Elshazly, T. et al. Effect of Trimming Line Design and Edge Extension of Orthodontic Aligners on Force Transmission: An in vitro Study. Journal of Dentistry (2022). doi: https://doi.org/10.1016/j.jdent.2022.104276
**The effect of gingival-margin design on the retention of thermoformed aligners” by Daniel P. Cowley, James Mah, and Brendan O’Toole
in the Journal of Clinical Orthodontics: JCO 11/2012; 46(11):697-702.
***Data on File. 90% accuracy within 100 microns. 98% accuracy with 150 microns.
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