662. <Cheek Fat Grafting>
Cheek fat grafting is a cosmetic procedure that involves transplanting fat into the cheek area to improve sunken cheeks and enhance the volume and three-dimensional contour of the midface.
There are two types of cheek fat: superficial and deep. First, the superficial fat, known as the malar fat pad, is located above the orbicularis oculi muscle, sitting atop the zygomatic bone under the eyes. It plays a key role in shaping the midface. The malar fat pad is divided into compartments, including the infraorbital compartment, medial cheek compartment, and nasolabial compartment. These compartments are separated by the medial cheek septum and the nasolabial septum, respectively.
Second, the deep fat, called the buccal fat pad, lies between the buccinator and zygomaticus muscles. It consists of three lobes that extend in four directions. The anterior lobe surrounds the parotid gland, the intermediate lobe lies between the anterior and posterior lobes, and the posterior lobe extends toward the temporalis muscle and mandibular ramus.
The buccal fat pad serves as a reservoir for sensory energy. While the orbital fat inside the orbicularis oculi within the orbital cavity acts as an energy reservoir for vision, the buccal fat pad in the oral cavity stores energy for general sensory functions. When we eat a lot, we use the buccinator muscle, reducing the buccal fat above it; similarly, frequent chewing activates the temporalis muscle, depleting the deep fat overlying it. However, during periods of rest, when these muscles are not in use, energy is replenished and stored in the cheek fat.
On the other hand, if a person experiences high levels of stress, overuses visual and auditory senses, speaks excessively, loses appetite, and avoids eating due to aversion to smells, energy is continuously depleted without being replenished. This can lead to progressive fat loss in the cheeks, resulting in a gaunt, skeletal appearance over time.
Conversely, if someone eats well and feels relaxed, cheek fat tends to increase. Another deep fat layer is the suborbicularis oculi fat (SOOF), located beneath the orbicularis oculi muscle in the lower eyelid. It acts as a cushion and maintains the soft contour and volume around the eyes, contributing to a youthful and healthy look. When SOOF diminishes or sags, the under-eye area may appear hollow, highlighting dark circles and forming tear troughs—common signs of aging.
Thus, if a patient has prominent tear troughs, fat is grafted into the SOOF area. If the area in front of the cheekbone looks flat, and the zygomatic bone itself is under-projected, fat is evenly injected into the periosteum, muscle, and subcutaneous fat layers of the cheekbone region.
Fat for grafting is usually harvested from the abdomen or thighs. It is then refined using a centrifuge and loaded into a fat injector. For precision, a micro-fat injection device is used, allowing for injections as small as 1/240cc. Typically, amounts between 1/120cc and 1/60cc are injected to balance cheek volume symmetrically. For example, if one has a habit of smiling more on one side, the buccinator muscle on that side may be slightly thicker. Therefore, more fat is injected on the side with the lower mouth corner, and less on the lifted side, to achieve better symmetry. Rather than injecting equal amounts, the procedure accounts for bone recession, muscle thickness, and soft tissue depth for meticulous adjustment.
For secondary grafts, patients may opt for cryopreserved fat that can be thawed and reinjected 2–3 months later. However, the fat's freshness declines, leading to a slightly higher absorption rate. This factor should be considered when planning a second fat graft.
Most patients seeking cheek fat grafting tend not to smile often, so practicing smiling to engage and lift the buccinator muscle is recommended.
[Cheek fat grafting replenishes the energy reservoir of the senses and restores aesthetic volume.]
—662mm Growth Pine Tree—