Needles Versus Cannulas: Advantages, Disadvantages, and Selection Criteria for Injecting Dermal Fillers

This review explores the efficacy and safety of using needles compared with cannulas for administering dermal fillers. We assessed and compared needles and cannulas based on the accuracy of injection, amount of associated tissue damage, procedural duration, vascular complications, and injection techniques and also highlighted their respective advantages and limitations. Needles facilitate rapid, precise injections and are suitable for shallow, targeted applications; however, because of their sharp points, if not handled with exacting techniques, needles pose a higher risk for misplacement, vascular damage, and tissue trauma. Conversely, because of their blunt tips, cannulas significantly reduce the potential for perforating blood vessels and thus provide a safer alternative for use in areas with a dense vascular network such as the forehead and nasolabial folds. Although requiring a longer procedure time and the creation of an entry point, using cannulas minimizes tissue disruption and is less likely to cause severe vascular complications. This research highlights the importance of choosing the appropriate injection tool based on specific treatment areas, desired outcomes, and inherent risks. Implementing an informed approach when using needles and cannulas can enhance both patient safety and aesthetic results in facial enhancements.