A zygomatic implant is a long implant anchored in the cheekbone; a subperiosteal implant is a custom framework resting on the jaw bone, under the gum. Both are discussed for severe upper jaw bone loss, with different risks. The choice depends on your CBCT scan, sinus, soft tissue and prosthetic plan, and is confirmed after an examination.
The essential difference is the anchorage. A zygomatic implant is a long implant that anchors in the cheekbone (the zygomatic bone); a subperiosteal implant is a custom-made framework that rests on the surface of the jaw bone, under the gum. Their risks differ too: the sinus and neighboring structures on one side, exposure or infection around the framework on the other. Neither is better in every case. Anatomy, soft tissue, the prosthetic plan, general health and the team’s experience decide, after a CBCT scan and a clinical examination.
Two techniques built on different principles
Both options are discussed when the upper jaw (maxilla) is severely atrophic, meaning the bone that remains is no longer enough to carry conventional implants. They answer that problem in very different ways.
Zygomatic implant
The implant crosses part of the upper jaw and finds its main anchorage in the zygomatic bone, the cheekbone. Depending on the bone defect and the strategy, it may be combined with conventional implants at the front, or several zygomatic implants may be used. Its path is planned in relation to the sinus, the eye socket (orbit), the soft tissue and the position of the future prosthesis.
Custom subperiosteal implant
A framework is designed from the CBCT scan and the prosthetic plan, then manufactured to fit the remaining bone. It does not seek deep anchorage in the zygomatic bone. Posts pass through the gum tissue (mucosa) to carry the prosthesis. The quality of the design, the fit, the fixation and the closure of the soft tissue are decisive.
For more detail on this option, see subperiosteal implants: risks, candidacy and what the process involves and the clinic’s page on subperiosteal implants.
Zygomatic vs subperiosteal: the side-by-side comparison
| Criterion | Zygomatic implant | Custom subperiosteal implant |
|---|---|---|
| Anchorage area | Zygomatic bone (cheekbone), long trajectory | Surface of the remaining jaw bone, planned fixation points |
| Typical situation discussed | Severe atrophy of the upper jaw | Selected severe atrophy, depending on the bone surface and soft tissue available |
| Lower jaw | No | Some devices may concern the lower jaw, depending on the indication |
| Manufacturing | Dedicated implant system | Device custom-made to the patient’s anatomy |
| Relationship with the sinus | Trajectory closely related to the sinus, depending on the approach | No zygomatic anchorage; the extent still depends on the anatomy of the jaw |
| Published track record | More developed clinical literature, but heterogeneous | Promising contemporary data, but more limited long-term follow-up |
| Specific complications | Sinusitis, oroantral communication (an opening between mouth and sinus), malposition, soft tissue or prosthetic problems, rare but serious anatomical complications | Exposure, infection, wound opening (dehiscence), fixation or fit problems, difficulty with cleaning or revision |
| Team requirement | Experienced zygomatic surgery, plus sinus and prosthetic management | Digital design, oral and maxillofacial surgery, and skilled soft tissue and prosthetic management |
This table describes principles, not a ranking.
When does each option enter the discussion?
Zygomatic implants
A zygomatic implant may be discussed for a patient with a major lack of bone at the back of the upper jaw, when extensive grafts are not desirable or have failed, and when the zygomatic bone offers a compatible anatomy. It is often proposed as an alternative to large upper jaw grafts, although small associated procedures may sometimes still be needed. The state of the sinus has to be studied, and a sinus condition may call for an opinion or treatment first.
Whether a fixed prosthesis can be placed quickly depends on the stability achieved, how the support is distributed across the implants and the management of the bite. It should not be promised before surgery: immediate loading remains a decision made according to the stability actually obtained.
Subperiosteal implants
A custom subperiosteal implant may be considered when the upper jaw is severely atrophic and a customized structure can be designed with support, fixation and soft tissue judged adequate. It may also come up when the zygomatic trajectory or the state of the sinus makes the zygomatic option unfavorable, but that always has to be judged case by case.
Being custom-made does not remove the biological uncertainties. It avoids zygomatic anchorage and some bone harvesting, but it still requires surgical exposure of the bone, fixation and demanding soft tissue management, so “less invasive” has to be judged case by case. Closure of the mucosa, hygiene around the posts and long-term maintenance are central.
And what about the pterygoid implant?
A third anchorage often comes up in the same conversation: the pterygoid implant. It is a long implant tilted toward the back of the upper jaw and anchored in the pterygoid region, behind the sinus, often combined with other implants placed further forward. It mainly addresses a lack of bone at the back, under the sinus, and does not always remove the need for an additional procedure. Our guide to pterygoid implants compares the three approaches.
If your real issue is thin or short bone rather than severe atrophy, neither of the two techniques above is automatically the answer. Short, narrow-diameter or tilted implants, or a pterygoid implant, may be considered depending on the posterior anatomy; see dental implants without a bone graft for that comparison.
What tests and steps come before choosing?
Before any decision, your file should include
- a CBCT scan covering the anatomical areas needed, of diagnostic quality;
- a clinical examination of the tissues, hygiene, infections and remaining teeth;
- an analysis of the sinus and, if needed, an ENT (ear, nose and throat) opinion;
- an impression or optical scan, and the plan for the future teeth;
- an analysis of the bite, teeth grinding (bruxism) and the opposing arch;
- any history of implants, grafts and sinus infections;
- a medical and anesthesia assessment suited to the operation: the type of anesthesia depends on the technique, its extent, your health and the care setting.
Planning should start from the prosthesis you want and how it will be maintained, then work back to the surgical solution, not the other way around. See CBCT and 3D planning for dental implants for what the scan changes.
If you are traveling to Istanbul from abroad
A file sent remotely only allows a first orientation. Before surgery, the plan must be confirmed in person. You should know how many stays are planned, whether the first prosthesis is temporary, which check-ups are needed, and how an emergency will be handled once you are back home.
At a minimum, you should receive an operative report, the relevant images, identification of the devices and components, the prosthetic plan, instructions, emergency contact details and a follow-up schedule.
Limits, risks, alternatives and reasons to postpone
The risks to know about
Both options carry the general risks of any surgery: pain, swelling, bleeding, infection, delayed healing, loss of an implant or support point, or a prosthetic problem. Zygomatic surgery takes place close to important anatomical structures, and sinus complications are monitored closely. A subperiosteal device can develop exposure or infection around the framework, and a revision can be complex.
Published rates are only comparable when the studies use the same criteria, the same techniques and equivalent follow-up periods. It would be misleading to display a single “success rate” without those details, so none is given here.
When to postpone or rule out these solutions
An active mouth or sinus infection, an unstable general condition, insufficient hygiene, smoking, unrealistic expectations or being unable to attend follow-up visits can lead to postponing or ruling out treatment. Limited mouth opening, inadequate prosthetic space, an unfavorable anatomy or fragile soft tissue can affect each option differently.
The decision sometimes involves consulting an ENT specialist, your own physician or an anesthesiologist.
Alternatives to discuss before advanced surgery
Depending on your file, the options to discuss include
- a bone graft, see bone graft or subperiosteal implant;
- a sinus lift, see the guide to sinus lift;
- conventional tilted implants at the front of the jaw;
- keeping strategic natural teeth;
- a stabilized removable denture;
- a non-implant treatment.
You should be able to understand why a less invasive option is not enough before consenting to advanced surgery.
Questions to ask for a second opinion
- [ ] Why are a conventional solution or a graft not suitable for me?
- [ ] Has my sinus been evaluated, and is an ENT opinion needed?
- [ ] What documented experience does the team have with the technique proposed?
- [ ] Who designs, who operates and who makes the prosthesis?
- [ ] What happens if the stability does not allow immediate loading?
- [ ] How would sinusitis, exposure or infection be managed?
- [ ] Can the prosthesis be detached for maintenance?
- [ ] Which check-ups can be done in my own country, and which require a return trip?
Sources
- ITI Consensus Database: recommendations and consensus statements in implant dentistry.
- European Association for Osseointegration: resources and consensus reports.
- PubMed: biomedical literature database, to find the systematic reviews and studies on each technique cited (zygomatic implants, custom subperiosteal devices).
Asking for an opinion on severe upper jaw bone loss
You can send your panoramic X-ray, your CBCT scan if you have one, and any earlier reports to prepare a first reading of your file. The clinic’s oral and maxillofacial surgeon, Assoc. Prof. Dr. Türker Yücesoy, can say whether the documents are usable and which examinations are missing.
A final proposal is made only after the necessary examinations and a discussion of the alternatives; no decision is expected at this stage. To compare a proposal you received elsewhere, see second opinion for dental implants.
This page is an information guide: it makes no diagnosis remotely and does not replace a clinical examination.
Frequently asked questions
What is the difference between zygomatic and subperiosteal implants?
The main difference is the anchorage: a zygomatic implant is a long implant that anchors in the cheekbone, while a subperiosteal implant is a custom framework resting on the surface of the jaw bone, under the gum. Risks differ too: the sinus and neighboring structures for one, exposure or infection around the framework for the other.
Zygomatic vs subperiosteal implants: which one is right for me?
Neither is better in every case. Both are discussed for severe bone loss in the upper jaw, and each carries different risks. The right choice depends on your CBCT scan, your sinus, the soft tissue, the prosthetic plan, your general health and the team's experience, and it can only be confirmed after an examination.
Is a subperiosteal implant less invasive than a zygomatic implant?
It avoids zygomatic anchorage and some bone harvesting, but it still requires surgical exposure of the bone, fixation and demanding soft tissue management. Whether it is less invasive therefore has to be defined case by case, by comparing both plans and the risks specific to each, after a CBCT scan and a clinical examination.
Do zygomatic implants always avoid a bone graft?
Not always. A zygomatic implant is often proposed as an alternative to large upper jaw grafts, but small associated procedures may sometimes still be needed. The exact plan depends on the anatomy of the sinus and the zygomatic bone, and is only confirmed after a CBCT scan and a clinical examination.
Is there an option for thin or short bone without a graft?
Sometimes. Short, narrow-diameter or tilted implants, or a pterygoid implant, may be considered depending on the posterior anatomy, whereas zygomatic and subperiosteal implants are mostly discussed for severe upper jaw atrophy rather than thin or short bone. Only a CBCT scan and a clinical examination can settle whether a graft can be avoided.
How do pterygoid implants compare with zygomatic implants?
Neither is better in every case. A pterygoid implant is long and tilted, anchored at the back of the upper jaw behind the sinus, often combined with implants placed further forward. A zygomatic implant anchors in the cheekbone and is mainly discussed in cases of severe atrophy. See our pterygoid implants guide for the full three-way comparison.
Can I have fixed teeth on the day of surgery?
An early fixed temporary prosthesis is sometimes possible when the stability achieved and the bite allow it. It cannot be promised before surgery: a removable or delayed solution should remain available if the criteria are not met during the operation.
Can I get an opinion from abroad before traveling to Istanbul?
You can send a panoramic X-ray, a CBCT scan if you have one and earlier reports for a first reading by Dr. Türker Clinic's oral and maxillofacial surgeon. This gives an orientation only: the plan is confirmed in person, after a clinical examination, and no decision is expected at that stage.
This guide informs; it does not replace a consultation or an individual diagnosis. Every case needs a clinical examination and 3D imaging.
