Sculptra and Radiesse are quite different. Sculptra is made of Poly-L-Lactic Acid and works by stimulating the body to produce its own collagen in response to the product. Sculptra takes several months to reach its full effect, and is usually injected through a series of treatments spread out over several months. Sculptra works best to restore volume in broad areas such as the cheeks or temples. Radiesse is a calcium hydroxylapetite product suspended in a water-based gel. Like Sculptra, Radiesse can work well for restoring volume, but can also work more directly on specific lines such as nasolabial folds. Radiesse results are visible immediately, whereas Sculptra results take time to develop. Radiesse can last 12 to 18 months, while Sculptra results may last 2-3 years in some cases. Neither product is reversible with hyaluronidase like the hyaluronic acid fillers (Restylane, Juvederm, Voluma, etc). Both products can work well for specific patients and applications. I always recommend seeing an expert physician injector for a personalized treatment plan. All the best,