study for efficacy assessment of two hyaluronic acid nasolab
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Hyaluronic acid fillers are considered safe for use in cosmetics as described in the safety assessment. This study was aimed to assess and compare the efficacy and safety of two hyaluronic acids (HA) fillers on mild nasolabial folds. Ten women aged 30-50 years with mild nasolabial folds participated in the injection of A and B gels into right or left nasolabial folds. The volume and surface of nasolabial folds were measured by CSI software and the density and thickness of the dermis were assessed by skin ultrasonography before and 2, 12, and 24 weeks after injection. The data were analyzed using SPSS software version 20, and p-value less than 0.05 were considered significant.

The global assessment showed over 50% improvement in patients injected with both gel A and B. At 2 weeks after injecting gel A the volume and surface of wrinkles decreased significantly. On the side injected with gel B, this reduction was significant at 2 and 12 weeks after injection. In addition, 24 weeks after injection of both gels the dermis echo density increased and the dermis thickness decreased. This study indicated the significant positive filling effect of both HA fillers in decreasing the clinical signs of wrinkles at nasolabial folds. Comparing both fillers, there were not any statistically significant differences in any of the measurements, but the persistence of gel B to improve the wrinkle appearance was slightly better than gel A.

Source:http://www.jsurgdermatol.com/index.php/JSD/article/view/170
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