.webp)
Zygomatic and pterygoid implants are not a premium upgrade to conventional implant treatment — they are a distinct clinical pathway for patients who cannot have conventional implants due to insufficient alveolar bone in the upper jaw. Understanding who is and who is not an appropriate candidate requires clarity about the specific anatomical and medical factors that the assessment covers.
The Core Candidacy Question: Is There Enough Alveolar Bone?
Conventional implants require adequate alveolar bone height and width at the planned implant sites. In the posterior upper jaw, two anatomical constraints limit this: the maxillary sinus above, and alveolar bone resorption below. After tooth loss, the alveolar ridge resorbs progressively. After years of edentulism or denture wear, the posterior maxilla may have as little as 2–3mm of residual bone between the sinus floor and the alveolar crest — completely inadequate for a standard-length implant.
Zygomatic implants bypass this problem entirely. Their anchorage is in the zygomatic bone (cheekbone) — a dense, cortical structure that does not resorb regardless of how long the patient has been edentulous. The question of zygomatic implant candidacy is therefore not primarily “how much alveolar bone does the patient have?” but rather “is there adequate zygomatic bone volume and anatomy to support the implants, and does the patient’s medical status permit the surgery?”
What the CBCT Assessment Determines
Every candidate assessment at Dazzle begins with a CBCT scan reviewed by the implantologist. The specific measurements and anatomical assessments from the CBCT that determine candidacy:
Residual alveolar bone height: Measured at each potential conventional implant site. If anterior bone (canine to canine region) has adequate height for two or four conventional implants, these are typically included in the plan alongside zygomatic implants. If even the anterior bone is severely deficient, a quad-zygoma approach (four zygomatic implants, no conventional implants) is considered.
Zygomatic bone volume and architecture: The inferior body of the zygoma must have adequate cortical thickness and volume to receive and retain a 35–50mm implant. The zygomatic bone is present in all patients and does not resorb, but anatomical variation in its size and shape affects the surgical approach. In most patients, zygomatic bone is adequate. In rare cases of very thin zygomatic anatomy, the implant trajectory must be planned carefully, or the approach modified.
Sinus anatomy: Sinus septal anatomy, Schneiderian membrane condition (if visible), and sinus floor morphology affect the surgical approach. The extrasinus (lateral window bypass) approach is used where the sinus anatomy makes the classic intrasinusal trajectory more complex.
Pterygoid plate dimensions: If pterygoid implants are planned for posterior maxillary support, the pterygoid plates are measured for height and cortical density. This determines whether pterygoid implants are appropriate in addition to or instead of posterior zygomatic implants.
Medical Factors That Affect Candidacy
Zygomatic implant surgery is more extensive than conventional implant surgery — longer operative time, greater soft tissue access, and a trajectory passing through or lateral to the sinus. Medical factors that affect candidacy:
Uncontrolled diabetes: Elevated HbA1c increases infection risk and impairs wound healing. Patients with diabetes are assessed with a recent HbA1c result; values below 7.5% (58 mmol/mol) are generally acceptable for elective implant surgery. Values above this require medical optimisation before surgery is planned.
Active smoking: Smoking reduces mucosal blood supply and significantly increases infection and implant failure rates. At Dazzle, smoking cessation of at least 2 weeks before surgery is required; longer cessation (6–8 weeks) is recommended. Zygomatic implant failure in active smokers is substantially higher than in non-smokers.
Bisphosphonate therapy: IV bisphosphonates (used for bone metastases) are a contraindication to major jaw surgery including zygomatic implants, due to medication-related osteonecrosis risk. Oral bisphosphonates (for osteoporosis) require individual assessment — risk increases with duration and dose. This is reviewed at consultation.
Previous maxillofacial surgery: Patients who have had sinus surgery, maxillofacial tumour resection, or cleft repair may have altered anatomy. This does not exclude zygomatic implant treatment but requires more detailed surgical planning from the CBCT.
Who Is Typically a Good Candidate
The patients who benefit most clearly from zygomatic/pterygoid implants: those told they need 12–18 months of bone grafting before implants; those with previous implant failures in the alveolar ridge; long-term denture wearers with significant posterior bone loss; patients who have been told conventional implants are “not possible”; and patients prioritising a shorter treatment timeline to fixed teeth over cost minimisation.
FAQs
Q1: Can I find out if I’m a candidate without travelling to Mumbai?
Yes. Send your existing CBCT DICOM files to Dazzle for remote review. The implantologist can assess your zygomatic and residual alveolar bone anatomy from the scan and provide a preliminary assessment and plan before you book flights. If you don’t have a current CBCT, a local scan can be arranged and the files sent digitally.
Q2: Are there patients who are NOT candidates for zygomatic implants?
Yes. Patients with uncontrolled systemic disease (uncontrolled diabetes, active bisphosphonate IV therapy, recent radiotherapy to the jaw region) are not candidates until medical status is optimised or the contraindication is resolved. Patients with very thin zygomatic anatomy in both arches are rare but occasionally not suitable for a standard zygomatic approach — alternative anchorage strategies are assessed in those cases.
Q3: Does the zygomatic implant pass through my cheek?
No. The implant is placed entirely inside the mouth through an intraoral incision. The implant body traverses from the alveolar ridge through the posterior maxilla to the zygomatic bone, but the entire surgical access is intraoral. There is no external incision and no visible scarring.
Q4: How long does the zygomatic implant surgery take?
A bilateral zygomatic case (two zygomatic implants, one per side) combined with anterior conventional implants typically takes 3–5 hours under local anaesthesia and IV sedation. A quad-zygoma case (four zygomatic implants) takes 4–6 hours. Patients are comfortable throughout; the primary recovery experience is post-operative swelling over the following 3–5 days.
