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• W2898045507 abstract "Background Sinus floor elevation is often applied to the molar region of the atrophic maxilla to increase in bone mass between the alveolar crest and the sinus floor. Although autogenous bone graft is, so far, gold standard, limitations of donor site bone volume and post-operative morbidity could be disadvantages. Thus, artificially synthesized bone substitutes, hydroxyapatite (HA) and tricalcium-phosphate (TCP), might be considerably useful materials compared to the autogenous bone. Aim/Hypothesis We have developed a novel technique of the sinus floor elevation using plate-shaped beta-TCP in order to perform surgery less invasively and to reduce the stress of patients. In this study, we evaluated the prognosis of this technique and the newly developed biomaterials. Material and Methods Thirteen patients were recruited in this study. The diameter and thickness of plate-shaped beta-TCP were approximately 10 mm and 2 mm, respectively. The bony windows were prepared on the lateral wall of the sinus and the sinus membrane was carefully removed and elevated. Then the TCP plate was inserted and supported with dental implants or micro-screws. Finally, bio-resorbable membrane was placed to cover the bony window and to avoid soft tissue infiltration. The panolamic X-ray and the cone beam CT was taken every year after the operations to evaluate the volume of newly formed bone, the implant stability, and the remodeling of TCP plates. This clinical research was approved by Ethics Committee, School of Dentistry, Iwate Medical University, and the patient's consent was also obtained. Results Thirteen operations of the sinus floor elevation with plate-shaped beta-TCPs have been performed since 2011. This study consisted of three men and ten women. The average age of all the patients was 53.3 years old. Four of those were staged approach and nine of those were simultaneous approach. Ten of 13 patients have had no complications concerning the abnormalities of the maxillary sinus from the postoperative to the present, and it passed well. In most cases, newly formed bone in the sinus was observed on X-ray photos 6 month after the operation. The good stability of the dental implant, at the second stage surgery, was confirmed. TCP plates remained in the same position and achieved the secure space making for long time. Panoramic X-ray and X-ray CT analyses revealed that TCP-plates were resorbed in 5 years post operation in most cases. There were two patients who complain of uncomfortable feeling and TCP plates were removed surgically. One TCP plate was spontaneously excreted. Conclusions and Clinical Implications In this clinical trial, a new bone formation was observed in the empty space between the TCP plate and the original sinus floor. TCP is a bone-conductive material and might have accelerated bone formation. Applying the newly developed technique with artificially synthesized bone substitutes could be a useful method to reduce patients’ stress. This newly established sinus floor elevation may bring better long term prognosis." @default.
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• W2898045507 date "2018-10-01" @default.
• W2898045507 modified "2023-09-27" @default.
• W2898045507 title "Long-term cases of sinus floor elevation using the plate shaped bone substitute" @default.
• W2898045507 doi "https://doi.org/10.1111/clr.301_13358" @default.
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