Authors: 
Daniel Perfeito, Renata Viana, Elaine Marques, Guilherme de Almeida
Abstract
Background
Suspension threads composed of poly-L-lactic acid (PLLA) and polycaprolactone (PCL) are widely used for nonsurgical facial rejuvenation. Accurate placement within the superficial musculoaponeurotic system (SMAS) is essential to reduce risks and optimize outcomes. Real-time high-frequency ultrasound with artificial intelligence (AI) may assist procedural accuracy. The safety of combining thr