Abstract

Objectives: To evaluate the aesthetic effects of polydioxanone (PDO) thread application in the periorbital region, focusing on the lower eyelid, in a series of patients treated with Pro Mono Eye threads (30G, 38 mm), based on clinical parameters related to skin laxity, fine wrinkles, and infraorbital contour. Introduction: Skin aging stimulates the demand for minimally invasive techniques, such as polydioxanone (PDO) threads, which promote tissue traction and collagen stimulation. Despite widespread use, there is limited literature on their application in the infraorbital region. This case report describes the use of Pro Mono Eye PDO threads with C-type cannula, 30G (38 mm), 50 mm thread, USP 6.0, for aesthetic treatment of the lower eyelid. Materials / method: Five female patients aged 44 to 60 years with lower eyelid laxity were included. Treatment consisted of five mono PDO threads (30G) inserted in each lower eyelid, totaling ten threads per patient. Insertion was performed after creating a skin entry point with a 30G needle. Results were assessed using standardized three-dimensional photographic imaging to minimize bias in comparative analysis. Results: Three-dimensional photographic analysis showed no major visible changes in the texture of the treated skin. However, when magnified and examined closely, improvement in dermal redensification was observed, promoting attenuation of fine dynamic rhytids in the delicate infraorbital region. All patients reported subjective improvement in firmness to the touch. One patient developed mild bruising, resolving spontaneously within days with local care. Conclusion: Although objective results were subtle, the use of 30G mono PDO threads demonstrated mild clinical improvement in lower eyelid laxity, particularly in tactile perception. Further studies with larger sample sizes, serial applications with increased thread quantity every 60 days, and quantitative assessment methods are recommended to validate these findings.