摘要

Objectives: This study aims to evaluate the efficacy of a novel extension-type cogged thread in addressing lower facial sagging, specifically focusing on the correction of nasolabial folds and marionette lines. By reversing the cog direction of traditional threads, this innovative design seeks to enhance tissue lifting and pushing effects in the lower face. Introduction: Threads are widely used in cosmetic procedures, with most relying on cogs to anchor tissues and induce contraction for lifting. While effective in the upper face to reverse sagging, the lower face often benefits more from pushing and lifting tissues. To address this, a specially designed extension-type thread was developed, reversing the cog direction of traditional threads, and applied to the lower face. Materials / method: From February to December 2024, bidirectional sculpted cogged threads (4 cm, PLACL material) were inserted into 20 patients to treat nasolabial folds and marionette lines. Photographs taken pre-procedure and two weeks post-procedure were analyzed and categorized as Good, Moderate, or No Change. Results: For nasolabial folds, 13 patients showed good results, 4 moderate, and 3 no change. For marionette lines, 17 patients showed good results, and 3 moderate. Conclusion: The specially designed extension-type cogged thread provided excellent aesthetic outcomes, particularly for lower facial sagging, and enhanced the efficacy of thread lifting technology, suggesting a significant advancement in minimally invasive cosmetic procedures.