Dissection under the SMAS muscle and pulling the muscle creates a pulled look. This is because the muscle distally (further way from the incision) is not fully released. This muscle retention further away holds the facial muscle in place and creates a pivot where the muscle is pulled. Consequently, this stretching of the muscle gives off a pulled look. In addition, the direction of the muscle pull is more horizontal rather than vertical as the retained distal muscle prevents a more vertical lift. Therefore, the face appears wide.
This may be beneficial for some Caucasian faces with narrow faces, but for Asians with wide faces, this will lead to wider faces. Furthermore, SMAS facelift does not effectively correct the jowl and, therefore, does not create a smooth, slender, V-shape jawline.
SMAS lift pulls the jowl backward toward the incision at the ear. This can improve the jowl but gives a wider jaw line as the skin, fat, and the muscle is pulled toward the incision (laterally/outward) which is along the ear. Lastly, because the SMAS muscle pull facelift does not correct the neck muscle (platysma), a separate incision is sometimes made on the chin to correct the neck wrinkles and bands. However, the neck muscle (platysma) and the SMAS muscle is the same continuous layer. They are joined in this same plane at the jawline region.
Contrary to muscle older anatomic text books, recent anatomic studies demonstrates that platysma muscle extends up to the face as they are joined with the SMAS. Therefore, by making an incision on the neck and tightening the neck centrally pulls the platysma muscle in the opposite direction from the SMAS pull. So in patients with aging neck, SMAS facelift will pull the SMAS laterally (outwardly) while the central neck incision will pull the neck centrally (inwardly). This will oppose one another’s pull and the jaw line will not improve because of this opposing effect. Therefore, patients undergoing SMAS facelift technique will either not undergo neck wrinkle / band correction or if the neck is corrected with chin/neck incision, then jaw line will not be effectively corrected.
Muscle release facelift surgery is fundamentally different, in that the muscle is not simply dissected, but the facial muscles are fully released.