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Dermatol Surg ; 48(10): 1071-1075, 2022 10 01.
Artigo em Inglês | MEDLINE | ID: mdl-35834659

RESUMO

BACKGROUND: Injectable poly- l -lactic acid (PLLA) is a new type of biodegradable dermal filler that has been utilized for soft tissue filling. However, there is no convenient and reliable method to assess the long-term safety of PLLA filler. OBJECTIVE: To assess the long-term safety of PLLA injection into nasolabial folds by high-frequency ultrasound and to select the ultrasonic probes with the most appropriate frequency. MATERIALS AND METHODS: After a 30-month PLLA injection into the deep dermis of the nasolabial fold, subjects were examined by high-frequency ultrasound with the 20 MHz and 50 MHz probes. RESULTS: Twenty subjects with nasolabial fold contour deficiency were enrolled in this study. After a 30-month PLLA injection in nasolabial folds, PLLA degraded entirely in 16 subjects (16/20, 80%), and abnormal echo in the skin was observed in 4 subjects (4/20, 20%) caused by undegraded PLLA microparticles, PLLA microparticles deposition, fibrous nodules, and granuloma. The 20-MHz probe is more appropriate than the 50-MHz probe for evaluating the adverse effects of PLLA injection. CONCLUSION: High-frequency ultrasound is a rapid, reliable, and noninvasive method to monitor the degradation condition of PLLA and the formation of papules and nodules associated with PLLA injection.


Assuntos
Técnicas Cosméticas , Preenchedores Dérmicos , Envelhecimento da Pele , Técnicas Cosméticas/efeitos adversos , Preenchedores Dérmicos/efeitos adversos , Humanos , Ácido Láctico/efeitos adversos , Sulco Nasogeniano , Poliésteres/efeitos adversos
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