To report retrospectively on the 12-years follow-up results of the treatment and rehabilitation of edentulous maxillae, applying extra-sinus zygomatic implants alone or in combination with intra-sinus zygomatic implants. We recruited 22 Patients with 35 zygomatic Brånemark System Implants; 24 implants in the standard Brånemark protocol through the sinus and 11 extra - sinus implants outside the sinus. Additionally, 147 regular implants were placed (Brånemark System, Straumann, Nobel Replace, SternGold). The minimum follow-up period was from 50 months to a maximum of 152 months. The Zygoma survival rate after 12 years was 97.15%. Chronic sinusitis occurred in 11.42% of patients. We lost 1 (2.85%) zygomatic implant placed through the sinus and none of those in the extra - sinus position. The survival rate of the regular implants was 93.87%. Chronic sinusitis occurred in 4 patients (11.42%) who received Zygomatic implants using the standard protocol through the sinus. None of the extra - sinus zygoma patients developed sinusitis. Peri - implantitis was detected with only three zygomatic implants. In the original P-I Brånemark zygoma protocol (Brånemark System, Sweden) the implants were passing through the sinus which resulted in chronic sinusitis in some patients and malposition of the prosthetic platform towards the palate. These complications can be avoided by the extra - sinus placement of zygoma implants as demonstrated in this study.

Purpose The aim of our studdy is clinical evaluation of Platform switch hybrid zygoma implants. Materials and Methods 117 zygomatic implants were followed up during this time. They included 55 Brånemark System zygoma implants, 38 Noris implants, and 24 novel iRES hybrid implants with platform switch. Results Bone quality and quantity are the prerequisite for successful implant treatment. Zygomatic implants are intended for patients with severely resorbed maxilla that cannot accommodate conventional implants without prior extensive bone grafting. Such regenerative procedures, like sinus lifts, prolong implant rehabilitation to several months (12–18). Furthermore, extensive grafts are less predictable showing varying degrees of graft resorption. Zygoma implants enable full, often immediate, reconstruction of the upper dental arch without the need for sinus lift treatment. The original zygoma protocol runs the implants through the sinus, requires general anesthesia, and positions the prosthetic platform of the implants on the palate, which makes prosthesis cumbersome. It also induces risk for post‐op sinusitis. Extra‐sinus approach with novel zygoma hybrid implants bypasses sinuses and positions the implant prosthetic platform on the crest allowing for same good prosthetics as on conventional dental implants. Furthermore, crestal threads and a platform‐switch, of the novel zygoma design, increase implant anchorage and minimize marginal bone loss. The study presents evolution of zygoma implant rehabilitation protocol and zygoma implant design in our clinical practice over 15 years (2004‐2019). Conclusion Extra‐sinus zygomatic implant placement lowers the risk of post‐op sinusitis and makes procedure possible to be done in local anesthesia.

J. Evaluation of circulating CD34+ stem cells in peripheral venous blood in patients with varying degrees of periodontal disease. Ann Agric Environ Med.

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