Abstract
Hyaluronic acid based fillers (HA fillers) are the most frequently used soft-tissue fillers. They have afavorable benefit-risk ratio compared to other fillers and they can usually be dissolved using hyaluronidase. The anatomical area to be injected contributes to filler selection. In general, products with lower cross linking are suitable for fine wrinkles and more viscous products with ahigher lift capacity for deeper wrinkles, but also for volume restoration, reestablishment of contours lost in the aging progress, and reshaping of anatomic facial regions. Profound knowledge of facial anatomy and its changes during aging processes, suitable patient selection, customized safe HA fillers and extensive experience with filler injection techniques are key prerequisites to perform this complex procedure. Comprehensive knowledge in the prevention and management of possible adverse events and complications are furthermore of paramount importance.
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