摘要

Objectives: To evaluate the effectiveness of quasi-long pulse Nd:YAG laser, delivered via collimated beam, for the improvement of skin tone. To assess the effects of low fluence, high pulse repetition rate Er:YAG laser on skin texture, and to determine the combined efficacy of both modalities in prejuvenation. Introduction: In recent years, there has been a marked shift in aesthetic dermatology toward preventive skin interventions, often referred to as prejuvenation. Prejuvenation focuses on non-invasive treatments to preserve skin quality and delay ageing signs in younger patients. Growing demand for no-downtime solutions has sparked an interest in non-ablative laser treatments. Quasi-long pulse Nd:YAG improves skin tone via deep dermal heating, while high repetition rate, non-ablative Er:YAG enhances texture and radiance. Their combined use may offer synergistic benefits for effective prejuvenation. Materials / method: 10 female patients between the ages of 20-35, skin types I-IV were treated with this multi-modality laser combination. Each patient received 3 treatments at 4-week intervals Nd:YAG 1064nm long pulsed laser Quasi long pulse mode - Pulse width: 700 microseconds, PRR: 10 Hz Er:YAG laser Thermal mode - Pulse width: 0.18msec, PRR: 20 Hz Patients completed both global aesthetic improvement scale and face-q questionnaires to assess their overall satisfaction, and to assess improvement in skin quality. Standardised photographs were taken before and 1 month post the final treatment session. Results: Patient-reported outcomes demonstrated promising results. The average Global Aesthetic Improvement Scale (GAIS) score was 3.5, reflecting mild to moderate visible improvement when comparing pre- and post-treatment photographs. Despite this modest objective change, all patients reported high satisfaction on the FACE-Q questionnaire. Of note, in this patient population with minimal baseline skin concerns, satisfaction with the prejuvenation treatment remained consistently high, highlighting the value of non-invasive treatments in early aesthetic care, or prejuvenation treatments. Conclusion: The combined use of high repetition rate, low-fluence Er:YAG and quasi-long pulse (QLP) Nd:YAG lasers is a non-ablative treatment targeting both superficial and deeper skin layers. Er:YAG at 20 Hz induces controlled sub-surface heating, while Nd:YAG penetrates more deeply to stimulate dermal remodelling. This treatment delivers effective skin rejuvenation with no downtime. As interest in prejuvenation grows,, the synergistic effects of dual laser wavelength modalities offers a promising solution for enhancing skin skin tone, texture, and radiance in younger patients.