What is better for flat cheekbones: Radiesse or Sculptra? Can they be combined?

Hello TW.  There are numerous dermal fillers (Radiesse is one) or biostimulators (Sculptra) that can be used for cheek hollows.  We love both of these products for cheek volume.  Radiesse has the benefit of immediate results and is a great "foundation" where other fillers can be used on top.  Sculptra is a very natural looking product that also improves the texture of the skin.  The drawback is that you don't see full results with Sculptra for 6-9 months.  You are on the right track with your filler options.  Now to find a great injector to provide the service!  Best of luck.

Thank you for your question. Sculptra is a biostimulator that works deep in the dermal structure to trigger the body to produce more collagen. The process takes time, so you may not see positive improvement for many months. Once the volume develops, it can last for up to two years. The advantage of Sculptra is that the results are very natural, since they form at a cellular level. 
Radiesse is a filler that contains calcium. The filler forms a scaffolding in the dermal layers to produce quick results. At the same time, the formula stimulates the body to produce more collagen, for long-lasting improvement. Hyaluronic acid fillers are another option for adding volume to the face. These work by providing support in the underlying dermal structure to produce immediate results. One advantage to HA fillers is that they can be reversed if you don’t like your result. That option is not available with Radiesse. I recommend scheduling a consultation with an experienced, board-certified dermatologist for a full assessment and treatment recommendations. 

There are many products on the market to add volume and sculpt the cheek area.  Both products you mentioned are appropriate as are other HA fillers.  HA fillers may be recommended over Sculptra if you are wanting more immediate results.  Visit with an experienced injector near you for a consultation.  Together you can select the right product based on your treatment goals.