|
In anatomy, Underwood's septa (or maxillary sinus septa, singular ''septum'')〔Maestre-Ferrín L, et al. (Maxillary sinus septa: a systematic review ). ''Med Oral Patol Oral Cir Bucal'' 2010;15(2):e383–6. PMID 19767706〕〔Lee WJ, et al. (Analysis of location and prevalence of maxillary sinus septa ). ''J Periodontal Implant Sci'' 2010;40(2):56–60. PMID 20498761〕 are fin-shaped projections of bone that may exist in the maxillary sinus, first described in 1910 by Arthur S. Underwood, an anatomist at King's College in London.〔Underwood, AS. An inquiry into the anatomy and pathology of the maxillary sinus. ''J Anat Physiol'' 1910;44:354-369.〕 The presence of septa at or near the floor of the sinus are of interest to the dental clinician when proposing or performing sinus floor elevation procedures because of an increased likelihood of surgical complications, such as tearing of the Schneiderian membrane.〔Boyne, P; James, RA. Grafting of the maxillary sinus floor with autogenous marrow and bone. ''J Oral Maxillofac Surg'' 1980;38:113–116.〕 The prevalence of Underwood's septa in relation to the floor of the maxillary sinus has been reported at nearly 32%.〔Ulm, CW, et al. Incidence and suggested surgical management of septa in sinus-lift procedures. ''Int J Oral Maxillofac Implants'' 1995;10:462–465.〕 ==Location of septa in the sinus== Underwood divided the maxillary sinus into three regions relating to zones of distinct tooth eruption activity: anterior (corresponding to the premolars), middle (corresponding to the first molar) and posterior (corresponding to the second molar). Thus, he asserted, these septa always arise between teeth and never opposite the middle of a tooth.〔 Different studies reveal a different predisposition for the presence of septa based on sinus region: * Anterior: Ulm, et al.,〔 Krennmair et al.〔Krennmair G, et al. The incidence, location, and height of maxillary sinus septa in the edentulous and dentate maxilla. ''J Oral Maxillofac Surg'' 1999;57:667-71.〕 * Middle: Velásquez-Plata et al.,〔Velásquez-Plata D, et al. Maxillary sinus septa: a 3-dimensional computerized tomographic scan analysis. ''Int J Oral Maxillofac Implants''. 2002;17:854-60.〕 Kim et al.〔Kim MJ, et al. Maxillary sinus septa: prevalence, height, location, and morphology: A reformatted computed tomography scan analysis. ''J Periodontol'' 2006;77:903-8.〕 and González-Santana et al.〔González-Santana H, et al. A study of the septa in the maxillary sinuses and the subantral alveolar processes in 30 patients. ''J Oral Implantol'' 2007;33:340-3.〕 * Posterior: Underwood〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Underwood's septa」の詳細全文を読む スポンサード リンク
|