title: Efficacy and safety of injection with poly-L-lactic acid compared with hyaluronic acid for correction of nasolabial fold: a randomized, evaluator-blinded, comparative study.
abstract: BACKGROUND
  Hyaluronic acid (HA) fillers and poly-L-lactic acid (PLA) fillers are frequently used to correct facial wrinkles.
  
  
  OBJECTIVE
  To compare the efficacy and safety of a novel injectable poly-L-lactic acid (PLA) filler and a well-studied biphasic HA filler for the treatment of moderate to severe nasolabial folds.
  
  
  METHODS
  In this multicentre, randomized, evaluator-blinded, comparative study, subjects were randomized for injections with PLA or HA into both nasolabial folds. Efficacy was determined by calculating the change in Wrinkle Severity Rating Scale (WSRS) relative to baseline. Local safety was assessed by reported adverse events.
  
  
  RESULTS
  At week 24, mean improvement in WSRS from baseline was 2.09 ± 0.68 for the PLA side and 1.54 ± 0.65 for the HA side. Both injections were well tolerated, and the adverse reactions were mild and transient in most cases.
  
  
  CONCLUSIONS
  PLA provides noninferior efficacy compared with HA 6 months after being used to treat moderate to severe nasolabial folds.
authors.affiliation: Department of Dermatology, Chung-Ang University College of Medicine, Seoul, South Korea.
authors.forename: M Y
authors.initials: MY
authors.lastname: Hyun
authors.forename: Y
authors.initials: Y
authors.lastname: Lee
authors.forename: Y A
authors.initials: YA
authors.lastname: No
authors.forename: K H
authors.initials: KH
authors.lastname: Yoo
authors.forename: M N
authors.initials: MN
authors.lastname: Kim
authors.forename: C K
authors.initials: CK
authors.lastname: Hong
authors.forename: S E
authors.initials: SE
authors.lastname: Chang
authors.forename: C H
authors.initials: CH
authors.lastname: Won
authors.forename: B J
authors.initials: BJ
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D003357:Cosmetic Techniques / Q000009:adverse effects; D003879:Dermatologic Agents / Q000008:administration & dosage* / Q000009:adverse effects; D005260:Female; D006801:Humans; D006820:Hyaluronic Acid / Q000008:administration & dosage* / Q000009:adverse effects; D007267:Injections / Q000009:adverse effects; D019344:Lactic Acid / Q000008:administration & dosage* / Q000009:adverse effects; D008297:Male; D008875:Middle Aged; D060052:Nasolabial Fold; D011091:Polyesters; D011108:Polymers / Q000008:administration & dosage* / Q000009:adverse effects; D015595:Skin Aging / Q000187:drug effects; D055675:Viscosupplements / Q000008:administration & dosage* / Q000009:adverse effects
chemical_list: D003879:Dermatologic Agents; D011091:Polyesters; D011108:Polymers; D055675:Viscosupplements; D019344:Lactic Acid; C033616:poly(lactide); D006820:Hyaluronic Acid