Internal Sinus Lift Procedure: Why It Is Done and What Patients Should Expect

An internal sinus lift is a bone-support procedure used when there is not enough bone height under the sinus to place a dental implant securely in the upper back jaw. The surgeon works through the implant site, gently raises the sinus membrane, and may place bone graft material to create more support for the implant.

For patients planning dental implants, this procedure can sound worrying because it involves the sinus. In reality, the sinus is not removed. The goal is to create controlled space beneath the sinus membrane so the implant can have better bone support.

At Mira Clinic, an internal sinus lift may cost around €300 per side when it is needed as part of a dental implant plan. The final cost depends on the implant brand, bone condition, graft needs, whether the implant is placed at the same appointment, and whether the final restoration is a crown, bridge, or full-arch solution.

This makes the internal sinus lift a preparation step for dental implants, not a separate cosmetic procedure.

What Is an Internal Sinus Lift?

An internal sinus lift, also called a crestal sinus lift, indirect sinus lift, or internal sinus augmentation, is a procedure used to increase bone support in the upper back jaw before or during dental implant placement.

The upper back teeth sit close to the maxillary sinus. When these teeth are lost, the bone below the sinus may shrink over time. In some patients, the sinus may also expand downward into the area where implants need to be placed. This can leave limited bone height for a stable dental implant.

During an internal sinus lift, the surgeon approaches the sinus floor through the same area prepared for the implant. The sinus membrane is gently lifted, and bone graft material may be placed underneath it. This creates extra support between the jawbone and sinus floor.

This procedure is usually considered when the patient needs a smaller bone-height increase compared with larger sinus augmentation cases. The final decision must be based on imaging, bone condition, sinus health, and implant stability.

Why Can the Sinus Affect Dental Implant Placement?

The maxillary sinus is an air-filled space located above the upper premolars and molars. Because it sits close to the roots of the upper back teeth, it can directly affect dental implant planning in that area.

When an upper molar or premolar is removed, the bone in that area may gradually shrink. At the same time, the sinus may sit low or expand into the missing tooth area. This can reduce the vertical bone available for implant placement.

A dental implant needs enough bone around it for initial stability and long-term support. If the remaining bone is too limited, placing an implant without additional planning may increase the risk of poor stability, sinus complications, or implant failure.

Patients may need an internal sinus lift because of:

• Limited bone height in the upper back jaw
• Bone loss after tooth extraction
• Natural sinus enlargement after tooth loss
• Need for stronger implant support
• Planning for an implant-supported crown or bridge
• Preparation for a larger implant restoration

An internal sinus lift is not automatically needed for every upper-jaw implant. It is recommended only when imaging shows that extra support is needed.

How Does the Internal Sinus Lift Procedure Work?

The internal sinus lift procedure is usually planned after clinical examination and imaging. The surgeon checks the available bone, sinus position, implant site, and whether the implant can be placed during the same appointment.

The procedure may include these steps:

1. Local anesthesia or the planned sedation method is provided.
2. The implant site is prepared through the jawbone.
3. The floor of the sinus is approached from below.
4. The sinus membrane is gently elevated.
5. Bone graft material may be inserted into the created space.
6. The dental implant may be placed during the same visit if stability is sufficient.
7. The area is allowed to heal according to the treatment plan.

The patient does not need to understand every surgical instrument used. What matters is understanding the purpose: the surgeon creates more support beneath the sinus so the implant can be placed in a safer and more stable position.

What Happens to the Sinus During the Procedure?

The sinus is not removed, emptied, or replaced. The thin sinus membrane is gently raised from below. A small space is created beneath the membrane, and bone graft material may be placed in that space.

The goal is to support the implant area, not to change the normal function of the sinus. If the membrane remains intact and the site is suitable, the implant may sometimes be placed during the same procedure.

Is Bone Graft Material Always Used?

Bone graft material is often used, but the exact approach depends on the case. The amount of graft depends on the existing bone height, implant position, and how much support is needed.

Different graft materials may be considered depending on the surgeon’s plan. No single graft material is best for every patient. The decision should be made after reviewing imaging, medical history, sinus condition, and implant goals.

Can the Dental Implant Be Placed at the Same Time?

Yes, in some cases. The implant may be placed during the same appointment if enough native bone remains for initial implant stability, the sinus membrane stays intact, there is no active infection, and the surgeon considers the site suitable.

In other cases, the graft may need time to heal before implant placement. This can extend the treatment timeline, but it may be safer when the available bone is too limited for immediate implant stability.

Internal vs External Sinus Lift: What Is the Difference?

The main difference between an internal and external sinus lift is the access point and the amount of bone support needed.

An internal sinus lift is usually considered when the patient still has enough bone to approach the sinus through the implant site. An external sinus lift may be recommended when more bone augmentation is needed or when the anatomy is better suited to a lateral approach.

The dentist or surgeon should decide based on CBCT imaging, sinus anatomy, bone volume, implant position, and the final restoration plan.

Read more: Crown vs Bridge for Back Teeth: Damaged or Missing Tooth?

Who Is a Suitable Candidate and When Is It Not the Best Option?

A suitable candidate for an internal sinus lift is usually a patient who needs a dental implant in the upper back jaw but has limited bone height below the sinus.

A patient may be suitable if they have:

• Missing upper premolars or molars
• Limited vertical bone under the sinus
• Enough remaining bone for implant stability
• Healthy or medically manageable sinus condition
• Acceptable gum and bone health
• Realistic expectations
• Ability to follow aftercare instructions

CBCT imaging and clinical examination are essential before deciding whether the internal approach is suitable.

An internal sinus lift may not be the best option when there is very limited remaining bone, active sinus infection, certain sinus conditions, uncontrolled medical issues, high smoking-related risk, unsuitable implant position, or inability to achieve implant stability.

In some cases, the patient may need an external sinus lift, staged bone grafting, medical clearance, sinus evaluation, or a different implant plan. This is why the procedure should be recommended after diagnosis, not as a routine step for every implant patient.

Recovery, Risks, and Healing Timeline

An internal sinus lift is usually performed with anesthesia, so patients should not feel sharp pain during the procedure. They may feel pressure or vibration. After treatment, mild swelling, tenderness, congestion, or discomfort may occur.

Patients should avoid assuming the procedure will be completely pain-free. The experience varies depending on the surgical site, graft amount, implant placement, and individual healing response.

After the procedure, patients may be advised to avoid actions that create pressure around the sinus or surgical site. General instructions may include avoiding forceful nose blowing, smoking, strenuous exercise, drinking through a straw, disturbing the surgical area, or ignoring prescribed medication instructions.

Patients should always follow the specific instructions given by their surgeon, because aftercare can vary by case.

Possible risks and complications include:

• Sinus membrane perforation
• Infection
• Sinusitis
• Graft movement or failure
• Bleeding
• Swelling
• Implant instability
• Delayed healing
• Need for an additional procedure

This does not mean complications are expected. It means patients should understand the risks before treatment and know when to contact the clinic.

Patients should report symptoms such as worsening pain, persistent or heavy bleeding, fever, unusual drainage, severe swelling, sinus infection symptoms, fluid passing between the mouth and nose, implant movement, or symptoms that worsen instead of improving.

Healing time varies. Initial soft-tissue recovery may happen earlier, while bone graft integration and implant integration take longer. The timing of the final crown or bridge depends on remaining bone, graft volume, implant stability, general health, smoking, healing response, and treatment complexity.

The success of an internal sinus lift depends on patient selection, sinus health, membrane integrity, available bone, surgical planning, implant stability, oral hygiene, smoking status, and postoperative care.

How Much Does an Internal Sinus Lift Cost?

The cost of an internal sinus lift depends on imaging, graft material, number of implant sites, surgical complexity, sedation, clinic location, and whether the implant is placed at the same appointment.

At Mira Clinic, an internal sinus lift may cost around €300 per side when clinically needed. This price should be understood as a procedure cost direction, not the full implant treatment cost.

The total implant plan may also include:

• Dental implant
• Abutment
• Crown or bridge
• Bone graft material
• Temporary restoration
• Sedation if planned
• Final prosthetic design
• Follow-up visits

Patients should always ask whether the quoted price includes only the sinus lift or also the implant, abutment, crown, bridge, temporary teeth, imaging, and follow-up adjustments.

Before treatment, patients should ask:

• Why do I need an internal sinus lift?
• How much bone do I currently have?
• Why is the internal approach suitable for me?
• Could I need an external sinus lift instead?
• Will bone graft material be used?
• Can my implant be placed at the same appointment?
• What risks apply to my case?
• What will recovery involve?
• When can the final crown or bridge be placed?
• What is included in the treatment cost?

These questions help patients understand whether the procedure is necessary, what it adds to the implant plan, and how it affects cost and treatment time.

Read more: Dental Implants With a Titanium Bar: Benefits, Cost, and Who Needs It