Comparative study of histological differences according to monopolar radiofrequency tip width.

Area of Science:

• Dermatology
• Aesthetic Medicine
• Biomedical Engineering

Background:

• Monopolar radiofrequency (RF) devices have evolved, particularly in tip dimensions impacting skin contact.
• Understanding how different tip sizes affect dermal tissue is crucial for optimizing RF treatments.

Purpose of the Study:

• To compare histometric changes in dermal collagen and elastic fibers following monopolar RF treatment with varying tip widths.
• To determine the efficacy of different RF tip sizes for skin tightening across different age groups.

Main Methods:

• Twenty-eight participants received one session of monopolar RF using either a 3x3 cm² (Group S) or 4x4 cm² (Group L) tip.
• Skin biopsies were collected pre-treatment and two months post-treatment.
• ImageJ software was used to quantify collagen and elastic fiber densities in the papillary and reticular dermis.

Main Results:

• Group L (larger tip) demonstrated significantly higher collagen density across all dermal layers compared to Group S (smaller tip), particularly in participants aged 20-39.
• In participants over 60 years old, Group S showed higher collagen density in the papillary dermis.
• A larger tip width correlated with deeper and more potent skin tightening effects.

Conclusions:

• Monopolar RF treatment with larger tip widths (4x4 cm²) leads to more significant collagenesis and skin tightening, especially in younger demographics.
• Smaller tip widths (3x3 cm²) may offer a more suitable approach for skin rejuvenation in older adults.
• Tip size selection in monopolar RF devices should be tailored to patient age and desired treatment outcomes for effective skin tightening.