Restoring Smiles When Bone is Severely Lost: Zygomatic Implants and All-on-4 in Action

Published in Nigerian Journal of Clinical Practice — September 2021. Authored by Dr. B. Srinivas Rao, Deepak K. Sangolikar, Sunil Kumar Mishra, and Ramesh Chowdhary.

One of the most difficult challenges in implant dentistry is treating patients who have lost most or all of their jawbone. This severe bone loss — called atrophic ridges — happens gradually over years after teeth are lost. The longer someone goes without teeth, the more the jawbone shrinks. Eventually, the remaining bone can become so thin and flat that placing conventional dental implants becomes impossible.

For many of these patients, the traditional answer has been bone grafting — a surgical procedure where bone is harvested from another part of the body (often the hip or chin) and transplanted to the jaw to rebuild volume before implants can be placed. While effective, bone grafting adds months of healing time, requires additional surgery, and is not always successful.

This case series, led by Dr. Srinivas, demonstrates an alternative approach that allowed three patients with severely atrophic jaws to receive permanent fixed teeth — without bone grafting.

The Three Cases **Case 1** presented a patient with severe upper jaw bone loss who had been wearing a loose, uncomfortable complete denture for years. The remaining bone in the upper jaw was insufficient for conventional implants anywhere along the arch. Dr. Srinivas placed [zygomatic implants](/services/zygomatic-implants) — extra-long implants that anchor into the cheekbone (zygoma) instead of the jawbone — combined with the All-on-4 concept to deliver a full set of fixed upper teeth as part of a [full mouth rehabilitation](/services/full-mouth-rehabilitation).

Case 2 involved a patient with severe bone loss in both the upper and lower jaws. The lower jaw was treated using the All-on-4 concept with four strategically tilted implants that maximised the available bone. The upper jaw, which had even less bone available, was rehabilitated using zygomatic implants.

Case 3 presented a patient with moderate-to-severe bone loss where a combination approach was used — conventional implants were placed where bone was adequate, supplemented by zygomatic implants in the posterior regions where bone was deficient.

What are Zygomatic Implants? Conventional dental implants are typically 8 to 13 millimetres long and are placed directly into the jawbone. Zygomatic implants are dramatically longer — ranging from 30 to 52.5 millimetres — and are angled through the upper jaw to anchor into the dense cheekbone above.

The cheekbone does not resorb the way the jawbone does after tooth loss, so it provides a reliable anchorage point even when the jaw itself has lost most of its bone. This eliminates the need for bone grafting entirely in many cases, allowing patients to receive fixed teeth in a fraction of the time.

Zygomatic implant placement requires advanced surgical training and experience. It is not a procedure offered at most dental clinics, which is why patients with severe bone loss are often told they are not candidates for implants at all.

What is the All-on-4 Concept? The All-on-4 treatment concept involves placing four implants in strategic positions within the jaw — two straight implants in the front and two tilted implants in the back. The tilting of the posterior implants allows them to engage longer stretches of available bone while avoiding critical anatomical structures like the sinus cavities in the upper jaw and the nerve canal in the lower jaw.

A full arch of fixed teeth — typically 10 to 14 teeth — is then attached to these four implants, often on the same day as surgery. This means patients can walk in without teeth and walk out with a complete set of fixed, non-removable teeth in a single appointment.

Outcomes All three patients in this case series were successfully rehabilitated with [full mouth rehabilitation](/services/full-mouth-rehabilitation) using fixed implant-supported prostheses. The zygomatic implants achieved excellent primary stability at the time of placement, and the prostheses were functioning well at follow-up. None of the patients required bone grafting, and all experienced significant improvements in chewing ability, speech, appearance, and quality of life.

What This Means for Patients If you have been told that you do not have enough bone for dental implants, that does not necessarily mean you are out of options. Dr. Srinivas is one of the few implantologists in Bangalore trained in zygomatic implant placement — a procedure that can bypass the need for bone grafting entirely and deliver permanent teeth even in the most challenging bone loss situations.

At Maxface Dental Clinic, Dr. Srinivas uses advanced 3D CBCT imaging to precisely map your remaining bone anatomy and determine whether zygomatic implants, the All-on-4 concept, or a combination approach is the best path to restoring your smile.

About the Publication Journal: Nigerian Journal of Clinical Practice

Published: September 2021

Type: Clinical Case Series

Read the original publication on ResearchGate.