Prof. Johnson Raja James, ZAGA Center Chennai, IN
Episode summary
Prof. Johnson Raja James, a periodontist and head of the ZAGA Center at ImplanTree International in Chennai, India, describes his practice of zygomatic implant rehabilitation for patients with severe maxillary bone loss. He explains the treatment to patients by showing CT scans and 3D-printed skull models, then plans each case using the ZAGA (Zygoma Anatomy-Guided Approach) classification developed by Dr. Carlos Aparicio, preparing guided stents so that a single zygoma placement takes about 15 to 20 minutes. He reports that the predominantly extra-sinus, minimally invasive approach yields near-nil post-operative sinusitis, minimal swelling, and low pain, with implants resting on the crest for prosthetic advantage. James loads roughly 99 percent of cases immediately and delivers a fixed prosthesis within three to four days, and he trains clinicians through the ImplanTree Foundation of Advanced Dentistry.
Key takeaways
- Prof. Johnson Raja James leads the ZAGA Center at ImplanTree International Dental Hospitals in Chennai, India, and has practiced implantology for about 18 years.
- Fewer than 2 percent of dentists worldwide perform zygomatic implants, and James trained in the extra-maxillary technique with Noris Medical.
- ZAGA stands for the Zygoma Anatomy-Guided Approach, a classification developed by Dr. Carlos Aparicio that makes pre-surgical planning central to treatment.
- James plans cases with CT analysis and 3D-printed skull models to map the implant trajectory, entry, exit, and crestal position, then uses guided stents so a single zygoma placement takes roughly 15 to 20 minutes.
- The predominantly extra-sinus ZAGA protocol produced only one case of sinusitis in his practice over about six years, with minimal swelling and low post-operative pain.
- James immediately loads about 99 percent of his cases and delivers a fixed prosthesis within three to four days, advising patients to avoid heavy chewing for the first three months while occlusion settles.
- Through the ImplanTree Foundation of Advanced Dentistry he has trained more than 200 doctors via live surgical workshops on zygomatic and pterygoid implants and All-on-4.
What you'll learn
- How to explain a zygomatic implant to a patient asking for fixed teeth
- Using 3D-printed skull models and guided stents to plan implant trajectory
- How the ZAGA (Zygoma Anatomy-Guided Approach) classification drives planning and reduces complications
- Achieving near-nil sinusitis and low post-operative morbidity with an extra-sinus approach
- Immediate loading of zygomatic implants and same-week delivery of a fixed prosthesis
About the guest
Prof. Johnson Raja James
Prof. Johnson Raja James is a periodontist and professor of periodontics who leads the ZAGA Center at ImplanTree International Dental Hospitals, a chain of clinics dedicated to advanced implantology in South India, based in Chennai. He has practiced implantology for roughly 18 years and trained in the extra-maxillary zygomatic technique with Noris Medical before joining the ZAGA Network. He also serves as Vice Principal and Professor at Rajas Dental College and Hospital and directs the ImplanTree Foundation of Advanced Dentistry, through which he has trained more than 200 doctors from India and abroad.
Credentials: Periodontist and Professor of Periodontics; senior implant consultant and Managing Director, ImplanTree International (ZAGA Center Chennai); Vice Principal and Professor, Rajas Dental College and Hospital
