Lateral window and crestal sinus lift procedures by board-certified periodontist Dr. Chanook David Ahn. Upper jaw bone augmentation to create sufficient foundation for dental implants. Located in Costa Mesa, just 10 minutes from Santa Ana via Bristol St or I-55 S.
A sinus lift, also known as sinus floor elevation or sinus augmentation, is a bone grafting procedure that increases the height of bone in the upper jaw by elevating the floor of the maxillary sinus and placing bone graft material beneath it. The procedure is specifically designed to address the unique anatomical challenge posed by the maxillary sinuses, which are large air-filled cavities that sit directly above the roots of the upper premolars and molars. When upper back teeth are lost or extracted, the bone in this region resorbs rapidly, and the sinus simultaneously expands downward into the space previously occupied by the tooth roots, a process called sinus pneumatization. The combined effect of bone resorption from above and sinus expansion from below can leave the remaining bone ridge too thin and too short to support dental implants.
The posterior upper jaw presents a unique challenge for implant dentistry because it loses bone faster than almost any other area of the mouth after tooth extraction. Studies show that bone height in the upper molar region can decrease by 1 to 2 millimeters per year after extraction, and in some patients the remaining bone between the ridge crest and the sinus floor can be as little as 1 to 3 millimeters within a few years. Standard dental implants require approximately 10 millimeters of bone height for adequate support and long-term stability. A sinus lift bridges this gap by creating new bone between the ridge and the elevated sinus membrane, restoring the dimensions needed for successful implant placement.
At The Loft Dental Studio in Costa Mesa, Dr. Chanook David Ahn performs both lateral window and crestal sinus lift procedures, selecting the technique best suited to each patient's anatomy and clinical needs. His Yale periodontal training, combined with over 5,000 implants placed throughout his career, provides the surgical expertise and anatomical knowledge that sinus lift procedures demand. Every case is planned using CBCT 3D imaging to precisely measure available bone, map the sinus anatomy, and identify any anatomical variations that could affect the surgical approach.
The maxillary sinus is the largest of the four pairs of paranasal sinuses. It occupies most of the body of the maxilla (upper jaw bone) and extends from just below the eye socket down to the level of the upper tooth roots. The floor of the sinus is lined by a thin mucous membrane called the Schneiderian membrane, which is typically 0.3 to 0.8 millimeters thick. This membrane is the critical anatomical structure in sinus lift surgery because it must be carefully elevated from the bony sinus floor without tearing in order to create the space for bone graft material.
When upper premolars and molars are present, their roots often extend very close to the sinus floor, and in some individuals the roots actually protrude into the sinus cavity with only the Schneiderian membrane covering them. After these teeth are extracted, the bone that surrounded the roots resorbs, and the sinus floor drops lower as the sinus expands into the newly available space. This sinus pneumatization is a normal physiological process, but it progressively reduces the available bone for implant placement.
Dr. Ahn uses CBCT (Cone Beam Computed Tomography) imaging for every sinus lift case. Unlike standard dental X-rays, which provide only a two-dimensional view, CBCT creates a detailed three-dimensional reconstruction of the sinus, the remaining bone, and the surrounding anatomical structures. This imaging allows Dr. Ahn to precisely measure the available bone height at each planned implant site, evaluate the thickness and condition of the Schneiderian membrane, identify sinus septae (bony partitions within the sinus that complicate membrane elevation), assess the location of the posterior superior alveolar artery (a blood vessel that must be avoided during lateral window access), and determine whether the sinus is healthy or has signs of mucosal thickening, polyps, or fluid that would need to be addressed before surgery.
Anatomical Variations Matter: Approximately 30 to 40 percent of patients have sinus septae, bony ridges within the sinus that can complicate membrane elevation. Dr. Ahn identifies these before surgery using CBCT imaging and modifies his surgical approach accordingly, which may involve creating two separate windows on either side of a septum rather than a single window. This level of pre-surgical planning is critical for avoiding membrane perforation and achieving a successful outcome.
The lateral window sinus lift, also called a direct sinus lift, is the most established and well-documented technique for sinus floor elevation. It is considered the gold standard when significant bone augmentation is needed, particularly when the residual bone height beneath the sinus is less than 5 millimeters.
Under local anesthesia with IV sedation or oral sedation available, Dr. Ahn creates a small incision in the gum tissue on the side of the upper jaw and reflects a tissue flap to expose the lateral wall of the maxillary sinus. Using piezoelectric instruments, he creates a small oval or rectangular window in the bone of the lateral sinus wall. The piezoelectric device cuts the bone precisely while leaving the underlying Schneiderian membrane intact, a significant safety advantage over traditional rotary instruments that can inadvertently perforate the delicate membrane.
Once the bony window is outlined, the bone segment is gently infractured inward, pivoting on the intact membrane like a trap door. Dr. Ahn then uses specialized curettes and elevators to gently separate the Schneiderian membrane from the sinus floor, elevating it upward to create a space between the membrane and the bone. This space is then filled with bone graft material, typically a combination of allograft and xenograft particles enhanced with PRF (Platelet-Rich Fibrin) derived from the patient's blood. The volume of graft material is calibrated to create the bone height needed for the planned implants. The tissue flap is then repositioned and sutured closed.
The crestal approach sinus lift, also called an indirect sinus lift or osteotome technique, is a less invasive alternative that accesses the sinus through the implant site itself rather than through a separate lateral window. This technique is appropriate when the patient has at least 5 to 8 millimeters of residual bone height and only moderate sinus floor elevation is needed.
Dr. Ahn prepares the implant osteotomy (the hole for the implant) through the crest of the ridge, stopping just short of the sinus floor. Using specialized osteotomes or a hydraulic sinus lift technique, he gently pushes the remaining thin layer of bone and the overlying Schneiderian membrane upward, creating a small space beneath the membrane. Bone graft material is introduced through the osteotomy into this space, and the membrane is elevated further as the graft material accumulates beneath it. In most crestal approach cases, the dental implant is placed immediately into the prepared osteotomy, achieving primary stability in the existing bone while the graft matures above and around the implant apex.
The choice between lateral window and crestal sinus lift is not about one being better than the other. Each technique has specific indications based on the patient's anatomy. The crestal approach is elegant and efficient when conditions allow it, but it has limitations in the volume of augmentation it can achieve. The lateral window approach is more involved but provides the access and visualization needed for larger augmentations and more complex anatomical situations. My approach is to always use the technique that gives the most predictable result for each individual patient, not the one that is simplest to perform. CBCT imaging before the consultation allows me to make this determination with confidence.
One of the most important treatment planning decisions in sinus lift cases is whether the dental implant can be placed at the same time as the sinus augmentation or whether a staged approach is needed. This decision depends primarily on the amount of residual bone available to provide primary stability for the implant.
When at least 4 to 5 millimeters of native bone height remains beneath the sinus, Dr. Ahn can typically place the implant at the same time as the sinus lift. The existing bone provides enough friction and mechanical lock to hold the implant stable while the graft material matures above the implant apex. Simultaneous placement is most commonly performed with the crestal approach but can also be done with the lateral window technique when adequate residual bone is present. The advantage is a single surgical procedure and a total treatment timeline of approximately 6 to 9 months from surgery to final restoration.
When the residual bone is less than 4 millimeters, there is typically insufficient bone to achieve primary implant stability. In these cases, a staged approach is recommended: the sinus lift is performed first, the graft heals for 6 to 9 months to allow new bone formation, and then the implant is placed into the augmented bone as a second surgical procedure. While the staged approach extends the total treatment timeline to approximately 12 to 15 months, it produces a more predictable outcome when the initial bone volume is severely deficient.
The selection of bone graft material for a sinus lift is critical because the graft must maintain volume within the sinus space for months while new bone gradually forms within and around it. Dr. Ahn selects materials based on the volume of augmentation needed, the patient's medical history, and the planned timeline for implant placement.
For sinus lifts, Dr. Ahn most commonly uses a combination of allograft (processed human donor bone) and xenograft (bovine-derived bone mineral). The allograft provides osteoinductive proteins that stimulate new bone formation, while the xenograft provides a slow-resorbing scaffold that maintains the volume of the graft over the extended healing period. This combination approach is well-supported by clinical research and produces dense, well-vascularized new bone suitable for implant placement.
PRF (Platelet-Rich Fibrin) is mixed with the graft material in every sinus lift procedure at The Loft Dental Studio. The concentrated growth factors in PRF enhance early vascularization of the graft, accelerate osteoblast recruitment, and improve the overall quality of the regenerated bone. PRF also serves as a natural membrane that can be placed over the lateral window access site to enhance soft tissue healing and protect the graft. Dr. Ahn provides PRF at no additional charge for sinus lift procedures.
Recovery from a sinus lift requires adherence to specific post-operative instructions, particularly regarding sinus precautions. Here is the typical recovery timeline.
Dr. Ahn uses CBCT 3D imaging to evaluate your upper jaw anatomy and determine the optimal sinus lift approach for your implant goals. Located in Costa Mesa, just 10 minutes from Santa Ana.
Call (714) 549-7030Sinus lift costs vary based on the technique used and the extent of augmentation required. At The Loft Dental Studio, we provide detailed cost estimates after your CBCT evaluation so you know exactly what your treatment will involve.
Many PPO dental insurance plans provide partial coverage for sinus lift surgery when it is performed as a medically necessary preparatory step for dental implant placement. Coverage typically ranges from 50 to 80 percent of the allowed fee depending on your plan's surgical benefits. Our administrative team verifies your benefits before treatment so you understand your out-of-pocket costs in advance.
PPO Plans We Accept: Delta Dental, Cigna, MetLife, Guardian, Aetna, United Healthcare, and Blue Cross Blue Shield.
We offer financing through CareCredit, which provides low-interest and interest-free payment plans. We also accept FSA (Flexible Spending Account) and HSA (Health Savings Account) funds. For more details, visit our Insurance & Payment page.
The Loft Dental Studio is located at 3151 Airway Ave, Suite F-103, in the South Coast Metro area of Costa Mesa. Our office is easily accessible from Santa Ana and throughout Orange County.
From central Santa Ana, take Bristol St south toward Costa Mesa. Continue on Bristol St for approximately 3 miles until you reach the South Coast Metro area. The drive takes about 10 minutes in normal traffic. Alternatively, take the I-55 S (Costa Mesa Freeway) south toward Newport Beach and exit at Baker St or South Coast Dr. Our office is just minutes from the freeway in the Airway Business Center.
A sinus lift is needed when there is insufficient bone height in the upper jaw posterior region (premolar and molar area) to support a dental implant. Standard dental implants require approximately 10 millimeters of bone height for adequate stability. When the available bone between the ridge crest and the sinus floor is less than this, a sinus lift is necessary to create the additional height. Dr. Ahn uses CBCT 3D imaging to precisely measure the available bone and determine whether a sinus lift is required. If you have been missing upper back teeth for several years, or if you were told you do not have enough bone for implants in the upper jaw, a sinus lift consultation is the logical next step.
Sinus lift surgery is a well-established and highly predictable procedure with decades of clinical evidence supporting its safety and effectiveness. Success rates exceed 95 percent in published studies. The most common complication is perforation of the sinus membrane (Schneiderian membrane), which occurs in approximately 10 to 20 percent of cases. When a small perforation occurs, Dr. Ahn repairs it immediately using a collagen membrane and PRF, and the procedure continues successfully. Larger perforations may require the procedure to be postponed for 3 to 6 months to allow the membrane to heal before reattempting. Post-operative sinus infection is rare and is treated with antibiotics when it occurs. Dr. Ahn's extensive experience with sinus anatomy and his use of piezoelectric instruments minimize the risk of membrane perforation.
In many cases, yes. When there is at least 4 to 5 millimeters of existing bone height beneath the sinus, Dr. Ahn can often place the dental implant simultaneously with the sinus lift. The existing bone provides enough primary stability to hold the implant while the graft matures around and above it. This combined approach is most commonly used with the crestal (indirect) technique, where both the sinus elevation and implant placement are performed through the same small access point. When there is less than 4 millimeters of existing bone, a staged approach is typically recommended: the sinus lift is performed first, the graft heals for 6 to 9 months, and then the implant is placed into the newly formed bone. Dr. Ahn determines the optimal approach based on your CBCT imaging and clinical evaluation.
Initial soft tissue healing from a sinus lift takes about 7 to 14 days. Swelling and mild discomfort typically peak on days 2 to 3 and then gradually subside. Most patients return to work within 2 to 3 days and feel significantly better by the end of the first week. The bone graft material requires considerably longer to mature and integrate with the native bone. For a lateral window sinus lift without simultaneous implant placement, the graft typically needs 6 to 9 months to develop sufficient density and volume for implant placement. For a crestal approach with simultaneous implant placement, the graft and implant heal together over 4 to 6 months before the final restoration can be attached. Dr. Ahn monitors healing with periodic CBCT imaging and determines when the graft has matured sufficiently.
The Schneiderian membrane that lines the sinus is thin and delicate, and small perforations can occur during sinus lift surgery even with the most careful technique. When a small perforation (less than 5 millimeters) occurs, Dr. Ahn repairs it immediately by placing a collagen membrane and PRF over the tear. The graft is then placed as planned, and the procedure continues without significant impact on the outcome. Clinical studies show that repaired small perforations do not reduce the success rate of the sinus lift. For larger perforations, Dr. Ahn may use a combination repair technique with multiple layers of collagen membrane and PRF. In rare cases of very large perforations, the procedure may be aborted and rescheduled after 3 to 6 months of membrane healing. Dr. Ahn uses piezoelectric instruments and a careful elevation technique to minimize the risk of perforation.
Sinus lift costs depend on the technique used and the extent of augmentation needed. A crestal (indirect) sinus lift, which is less invasive and often performed simultaneously with implant placement, typically ranges from $1,500 to $3,000 per site. A lateral window sinus lift, used for more significant bone deficiencies, typically ranges from $3,000 to $6,000 per side. These fees include the bone graft material, PRF therapy, and all follow-up visits. Many PPO dental insurance plans provide partial coverage for sinus lift surgery when it is performed as a medically necessary step in preparation for dental implant placement. The Loft Dental Studio accepts most major PPO plans including Delta Dental, Cigna, MetLife, Guardian, Aetna, United Healthcare, and Blue Cross Blue Shield. Financing through CareCredit and FSA/HSA funds are also accepted.