{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,4]],"date-time":"2026-07-04T10:20:11Z","timestamp":1783160411949,"version":"3.54.6"},"reference-count":71,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2008,2,11]],"date-time":"2008-02-11T00:00:00Z","timestamp":1202688000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clinical Oral Implants Res"],"published-print":{"date-parts":[[2008,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:bold>Objective of the study: <\/jats:bold> To present a classification of maxillary defects necessitating sinus floor elevation procedures (SFEPs) with two objectives: (a) to propose a standardization of surgical procedures according to initial type of atrophy and (b) to allow the evaluation of the success\/survival rates of implants placed in the grafted areas according to the initial situation.<\/jats:p><jats:p><jats:bold>Materials and methods: <\/jats:bold> Nine\u2010hundred and fifty\u2010two consecutive SFEP were performed on 692 patients. Initial defects were classified according to a new classification, which considered not only residual bone height below the sinus but also the width of the alveolar crest and horizontal\/vertical intermaxillary relationship. Results were evaluated according to the different classes. The sinuses were grafted with autogenous bone taken from intra\u2010oral or extra\u2010oral sites: 579 SFEP were associated with vertical and\/or horizontal onlay grafts to correct concomitant alveolar ridge deficits. A total of 2037 implants were inserted into the grafted sinuses either immediately or 4\u20136 months later. Three to 6 months afterwards, implants were loaded. The mean follow\u2010up was 59 months (range: 12\u2013144 months).<\/jats:p><jats:p><jats:bold>Results: <\/jats:bold> The success rate of the reconstructive procedures varied between 93.2% and 100%, according to class of atrophy; the overall survival and success rates of implants were 95.8% and 92.5%, respectively, whereas the survival and success rates according to class of atrophy varied between 90% and 97.6%, and between 85.4% and 95.5%, respectively. Lower success rates were found in classes presenting with more severe atrophy.<\/jats:p><jats:p><jats:bold>Conclusion: <\/jats:bold> The results obtained demonstrated that sinus floor elevation, alone or in association with reconstructive procedures with autogenous bone grafts, is a reliable procedure to allow implant placement in atrophic edentulous maxillae, irrespective of the initial clinical situation. However, it must be underlined that the success rates of reconstructive procedures and implants differ according to class of atrophy, showing lower success rates in classes presenting with more severe atrophy.<\/jats:p>","DOI":"10.1111\/j.1600-0501.2007.01489.x","type":"journal-article","created":{"date-parts":[[2008,2,11]],"date-time":"2008-02-11T11:01:50Z","timestamp":1202727710000},"page":"416-428","source":"Crossref","is-referenced-by-count":71,"title":["Dental implants placed in grafted maxillary sinuses: a retrospective analysis of clinical outcome according to the initial clinical situation and a proposal of defect 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