In vitro evaluation of aspiration of hyaluronic acid filler with a new saline flashing method.

Aspiration was possible only in few trials with HA fillers for the 27G and all false for 29G needle, respectively. The aspiration with the novel saline flashing procedure is successful for 100% of cases with the two commonly used HA fillers and all needle sizes. The time to aspiration is also significantly shorter with the saline flashing.