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BACKGROUND Hyaluronic acid–based dermal fillers are the cornerstones of wrinkle correction and facial contour redefinition. OBJECTIVE To assess the efficacy and safety of EST LF compared with RES L for the treatment of nasolabial folds (NLFs). MATERIALS AND METHODS In this prospective, split-face, randomized, investigator and subject-blinded trial, 45 subjects with moderate-to-severe symmetrical NLFs were randomized to EST LF on one side of the face and RES L on the other side and were followed up for 9 months. The primary end point was change in WSRS score from the baseline to Month 1 (M1). Secondary end points included changes in WSRS score at other time points, aesthetic improvement, wrinkle volume quantification, adverse events, and local tolerance. RESULTS The efficacy difference between EST LF and RES L at M1 was in favor of EST LF (−0.16, CI, −0.28 to −0.03]), demonstrating its noninferiority. Considering other time points, significant differences were observed at 3 and 6 months for EST LF , assessed with WSRS, GAIS, or NLF volume quantification. Both treatments were well tolerated. CONCLUSION EST LF is effective and well tolerated for the treatment of NLFs.
Lheritier et al. (Tue,) studied this question.