How Does Sculptra Build Collagen if It's Injected into Muscle (Temple)?

Sculptra temple injections are performed beneath the temporalis muscle to plump the temples. An additional advantage to injecting Sculptra and other fillers deep to the muscle is that this location reduces trismus or pain with opening the jaw. If you have had injections into or surgery on that muscle before, you realize that trismus can be very uncomfortable but is typically temporary. Sculptra injections elsewhere in the face are typically placed either in the deep dermis or just above the facial bones. Areas to avoid with this treatment include the eyelids and lips as Sculptra treatment of this area can result in nodules.
Thank you for your question.Stephen Weber MD, FACS

Within the deep dermis, your skin's structure is reinforced as Sculptra helps to replace lost collagen. This reinforced collagen structure provides a foundation that gradually restores the look of fullness of your shallow to deep facial wrinkles and folds that has been depleted over time. 

GREAT Question! Sculptra is a great treatment for adding volume to the temples. Although there has not been scientific studies on this topic, but most experts believe that the area around the periosteum (tissue attached to the bone) likely increases in thickness. In order to treat the temples, your doctor needs to inject the Sculptra as deep as possible, which is usually below the muscle and close to the bone. Sculptra then stimulates the growth of new collagen, which lifts the muscles to create a more youthful appearance.