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Demonstrates how a longitudinal space beneath the vermilion margin facilitates linear filler spread, suggesting anatomical implications.
A consistent longitudinal potential space beneath the vermilion margin can facilitate long-segment, linear filler distribution after single-entry injection. The "vermilion canal" concept offers a simple anatomic explanation for border tracking and may support a streamlined, plane-specific approach for creating a crisp vermilion border line while maintaining vigilance for vascular variability.
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Walker et al. (2026) studied this question.
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