Will Dental Implants Affect My Sinuses Long-Term?

It is one of the more common questions raised at an implant consultation, and it usually arrives with a slightly embarrassed preface — "this might sound silly, but…". It is not a silly question. In the upper back jaw, the floor of the maxillary sinus can sit remarkably close to where an implant needs to go, sometimes with only a few millimetres of bone between them.

The reassuring part is that this relationship is entirely predictable. It is mapped in three dimensions before any decision is made, and where the bone is insufficient the sinus floor is raised deliberately and carefully rather than encountered by accident. The unhelpful part is that "sinus lift" sounds far more dramatic than it is, and patients often arrive having read something alarming.

This article sets out what the anatomy actually is, how proximity is assessed, what happens when the sinus needs to be involved, and what the long-term outlook for sinus health looks like afterwards.

Will an upper implant affect my sinuses years later?

For most patients, a properly planned and placed upper implant does not cause ongoing sinus problems. The maxillary sinus is lined by a membrane that is resilient and heals well, and where an implant or graft is placed with that membrane intact and the site free of infection, long-term sinus function is typically unaffected. Complications do occur — sinus infection, membrane perforation during surgery, or an implant that migrates into the sinus space — but these are uncommon and are considerably less likely where three-dimensional imaging has been used, existing sinus disease has been addressed first, and the surgery is carried out with appropriate technique.

The maxillary sinuses are a pair of air-filled cavities within the cheekbones, sitting directly above the roots of the upper back teeth. They lighten the skull, contribute to voice resonance, and are lined by a thin mucous membrane — the Schneiderian membrane — which produces mucus and clears it via cilia towards a drainage opening.

Two features matter for implant planning:

The sinus expands when teeth are lost. Once an upper molar or premolar is removed, the ridge below resorbs from one side while the sinus tends to pneumatise downwards from the other. Over years, the available height between the crest of the ridge and the sinus floor can reduce substantially.

Root proximity is highly variable. In some people the roots of the upper molars indent the sinus floor visibly; in others there is a thick layer of bone between. Neither is abnormal, but the difference materially changes the plan.

Our article on why bone quality matters more than quantity covers the wider assessment of the implant site.

A two-dimensional radiograph cannot answer this question reliably. Planning for the upper back jaw normally involves a cone beam CT scan, which allows measurement of:

• The height of bone between the ridge crest and the sinus floor at the precise proposed site

• The width of the ridge

• The presence of septa — bony walls dividing the sinus, which alter surgical access

• The thickness and health of the sinus lining

• Any existing sinus opacification, polyps or blocked drainage

• The position of blood vessels within the lateral wall

Where the scan shows existing sinus disease, referral to a medical colleague for assessment usually precedes any surgery. Operating into an already inflamed or obstructed sinus is avoidable, and avoiding it is one of the more useful things imaging allows.

A sinus lift — more accurately, sinus floor elevation — raises the membrane away from the sinus floor and places graft material in the space created, so that there is sufficient height of bone for an implant.

Where a moderate increase in height is needed, the elevation is performed through the implant site itself. Instruments gently raise the sinus floor upwards, graft material may be introduced, and the implant is frequently placed at the same visit. Recovery is generally comparable to a straightforward implant.

Where a greater increase is required, a small window is made in the outer wall of the sinus, the membrane is lifted under direct vision, and graft material is placed. The implant may be placed simultaneously or after a healing period of several months.

Not every case needs the sinus involved. Shorter implants, angled placement, or a design supported on fewer, strategically positioned implants can sometimes make use of the bone that is already present. Our article on angled placement where bone density is low explains this principle, and the biomechanics of angled implants covers why it works.

The Schneiderian membrane is the protective boundary between the graft site and the sinus cavity. Keeping it intact during elevation is the central technical objective of the procedure.

Small perforations are not rare, particularly where the membrane is thin or a bony septum complicates access. They are usually manageable at the time — repaired with a collagen membrane, or the procedure staged — and where managed properly they do not necessarily change the outcome. A perforation left unaddressed is a different matter, because it allows graft particles into the sinus and creates a route for infection.

This is one of the reasons the pre-operative scan is worth the time it takes: it flags the anatomy that makes perforation more likely before the surgery begins.

In the days following sinus-related surgery it is normal to experience:

• Swelling of the cheek and sometimes under the eye

• Bruising

• A blocked or full sensation on that side

• Small amounts of blood-tinged discharge from the nostril

• Discomfort managed with the analgesia advised

You will usually be asked to avoid blowing your nose, to sneeze with your mouth open, to avoid straws and to avoid flying or diving for a defined period. These instructions exist to prevent pressure changes disturbing the graft.

Symptoms that warrant prompt contact with the practice include increasing rather than settling pain after the first few days, thick or foul-smelling nasal discharge, fever, or graft material appearing in the nose.

Once healing is complete and the graft has consolidated, the sinus reverts to functioning as it did before. Studies following patients over long periods report that sinus health is generally maintained, with the sinus lining returning to normal thickness in the majority of cases.

The factors that most influence the long-term picture are:

• Whether existing sinus disease was identified and managed beforehand. This is the single most useful predictor.

• Whether the membrane remained intact or was properly repaired.

• Whether the implant remains free of peri-implant infection. Infection around an upper implant can extend towards the sinus, which is why maintenance matters. See our article on infection around an implant years after treatment.

• Smoking, which impairs mucociliary clearance and healing alike.

• Allergic rhinitis and chronic sinusitis, which need medical management in their own right.

• Clean thoroughly around the implant daily, including interdentally. Our article on water flossers and oral irrigators for implants covers useful adjuncts.

• Attend professional maintenance at the interval advised — see our dental hygiene page.

• Report bleeding or swelling around an implant early rather than waiting.

• Manage nasal allergies with your GP or pharmacist.

• Do not smoke.

The NHS provides general information about dental implants at nhs.uk.

Arrange an assessment if:

• You are considering replacing an upper back tooth and want to know whether the sinus is involved.

• You have been told you need a sinus lift and would like the reasoning explained with imaging.

• You have recurring sinusitis and are considering upper jaw implants.

• You have persistent one-sided nasal symptoms following implant surgery.

• You notice a bad taste, discharge or air passing between mouth and nose.

• An existing upper implant has become loose or the gum around it bleeds.

• The maxillary sinus sits directly above the upper back teeth, and expands downwards after those teeth are lost.

• Proximity is mapped with cone beam CT before planning, not estimated from a standard radiograph.

• A sinus lift raises the membrane and places graft material to create bone height.

• Indirect elevation is performed through the implant site; the lateral window approach is used for larger increases.

• The sinus can sometimes be avoided altogether using shorter or angled implants.

• Membrane perforation is manageable when identified and repaired at the time.

• Short-term blocked sensation, swelling and blood-tinged discharge are expected; worsening pain or foul discharge is not.

• Long-term sinus function is typically unaffected where planning and maintenance are sound.

Sinus involvement in upper jaw implant treatment is common, well understood and routinely managed. What makes the difference is not avoiding the sinus but knowing exactly where it is before starting, dealing with any existing sinus disease first, and maintaining the implant properly afterwards.

If you would like an assessment of the upper back jaw with three-dimensional imaging and a written plan, you can arrange an appointment with our team at 22 Wimpole St, London W1G 8GQ, or telephone 020 7183 0692.

Dental symptoms and treatment options should always be assessed individually during a clinical examination.

This article is for general educational information only and is not professional dental advice, diagnosis, or a treatment recommendation. Information here is general and cannot replace an in-person assessment by a qualified, GDC-registered dental professional. Symptoms, suitability, fees, timelines, and outcomes vary according to individual clinical circumstances. If you have pain, swelling, or other concerning symptoms, seek prompt professional dental care. Always request a written treatment plan and cost estimate before proceeding with treatment.

Written Date: 26 August 2026

Next Review Date: 26 August 2027