2026-09-27
Square Jaw Surgery: Is Bone Reduction Enough? Cortical Osteotomy, Masseter Muscle Reduction, and Buccal Fat Removal
Discover why square jaw surgery addresses bone thickness, masseter muscles, and buccal fat alongside long curved bone reduction to achieve a natural, slim jawline from both the side and front.
Hello, this is 345 Plastic Surgery.
If you are concerned that your lower face appears unusually wide or angular when viewed from the front, you might consider square jaw surgery.
However, the underlying reasons why a jaw looks prominent are not the same for everyone.
Today, let’s explore why cortical osteotomy, masseter muscle reduction, and buccal fat removal are often evaluated alongside long curved ostectomy in square jaw reduction surgery.
A square jaw is not solely caused by outward bone development in the mandible.
In some cases, the mandibular angle itself is prominent, while in others, the outer cortical bone is thick, making the lower face appear wide from a frontal view.
Additionally, a lower face can look bulky if the masseter muscle—the muscle used for chewing—is excessively developed, or if there is excess deep cheek fat (buccal fat pad).
Therefore, when planning square jaw surgery, it is critical not just to look at the bone contour, but to comprehensively evaluate the overall facial shape, bone thickness, and the status of muscles and fat tissues.
1. Long Curved Mandible Reduction: Creating a Smooth, Seamless Jawline
Long curved ostectomy refines the jawline by cutting the developed lower jawbone in a continuous, smooth, curved line.
Instead of just cutting away the angular corner in a short, abrupt manner, the surgical scope and curve are planned by considering the entire transition from the chin tip to the mandibular angle.
2. Cortical Osteotomy: Addressing Frontal Jaw Width
Even if the jaw angle appears improved from the side, the lower face may still look wide from the front.
One key factor to evaluate in such cases is the thickness of the cortical bone.
Cortical osteotomy involves shaving or resecting a portion of the outer cortical layer of the mandible. When bone thickness itself contributes to facial width, this technique effectively helps narrow the lower face from a frontal perspective.
3. Masseter Muscle Reduction: Addressing Developed Chewing Muscles
When you clench your teeth, the firm muscle bulging at the sides of your jaw is the masseter muscle.
If the masseter muscle is overly hypertrophic, the lower face can retain a bulky look from the front even after bone reduction.
When necessary, masseter muscle reduction can be combined with square jaw surgery to create a softer, more refined facial contour.
4. Buccal Fat Removal: Managing Mid-to-Lower Cheek Volume
Buccal fat is located deep inside the cheeks. Depending on its volume and distribution, it can make the cheeks or lower face appear chubby and heavy.
Particularly when cheek volume is pronounced along with bone or muscle prominence, the volume and position of buccal fat pads should also be assessed.
However, because buccal fat provides structural volume to the face, it should not be removed indiscriminately. It is essential to inspect the facial structure and fat distribution thoroughly, deciding on removal only when truly needed.
Looking at real clinical cases at 345 Plastic Surgery,
you can see that surgeries are planned with comprehensive facial balance and structure in mind, utilizing long curved ostectomy as a base and combining cortical osteotomy or masseter reduction whenever indicated.
Facial contouring requires thorough attention not only to surgical planning, but also to anesthesia safety and post-operative care.
At 345 Plastic Surgery, we operate the Doctor Call system, where the operating surgeon directly calls patients the day after surgery to monitor recovery.
Additionally, three board-certified anesthesiologists are on-site full-time to handle anesthesia protocols safely.
We also keep Dantrolene in stock at all times to prepare for malignant hyperthermia, and our facility is fully equipped with safety equipment such as defibrillators for unforeseen emergencies.
Dr. Jong-Lim Park, Chief Director and bone specialist at 345 Plastic Surgery, meticulously customizes the surgical plan based on deep facial contouring experience, structural knowledge, and overall balance.
If a prominent lower face or square jaw is your concern, visit 345 Plastic Surgery for a personalized consultation tailored to your unique facial profile. 💙
Thank you. 😊
Frequently Asked Questions
Why is cortical osteotomy needed in square jaw surgery?
It is needed to effectively reduce the width of the lower face from a frontal perspective. Even if the side angle is shaved, the front view may still appear wide if the outer bone layer is thick; thinning the cortical bone resolves this issue.
How does long curved ostectomy differ from conventional square jaw reduction?
Unlike older methods that merely cut off the sharp rear corner, long curved ostectomy resects the jawbone in a smooth, extended curve all the way from the mandibular angle toward the chin, creating an unbroken and natural contour.
Must masseter muscle reduction always be performed together with square jaw surgery?
No, it is only performed selectively when the chewing muscles are excessively enlarged. If the masseter muscle causes residual bulkiness even after bone reduction, pairing it with muscle reduction provides a much slimmer result.
Should buccal fat pads always be removed during jaw surgery?
No, it should only be removed if necessary after checking facial structure and fat distribution. Buccal fat contributes to facial volume, so removal is considered only when excess fat makes the lower cheeks appear excessively heavy or puffy.