• 作者： 侯桂林; 黃景勝
• 作者服務機構： 高雄醫學院牙醫學系
• 中文摘要： 從臺灣山地人44具頭骨中觀察337顆臼齒，檢查、記錄齒頸部釉質突起（cervical enamelprojection）在上、下顎臼齒的發生率、位置、對稱性及種類；然後再以卡方檢定決（Chi-square）分析第一級、第二級和第三級齒頸部釉質突起和根叉齒槽骨破壞程度的關係，結果摘要如下：1.上顎釉質突起的發生率是82.2%；下顎是87.5%；平均是84.9%。2.第三級釉質突起（Grade III enamel grojections）大部份在頰面發生；而第一級釉質突起（ Grade I enamel projections）大部份在舌面、近心面和遠心面出現。3.釉質突起發生自高至低的次序為，下顎第一臼齒、上顎第二臼齒、下顎第二臼齒、上顎第一臼 齒、下顎第三臼齒、上顎第三臼齒。4.第二級和第三級釉質突起和根叉齒槽骨破壞之程度與沒有釉質突起的牙周狀況作比較，統計上 顯示有意義之差別；而第一級釉質突起和根叉齒槽骨病變之關係不明顯。5.齒頸部釉質突起左右對稱性的發生率高達78.2%。
• 英文摘要： Three hundred and thirty-seven molarsfrom Taiwanese Aboriginal skulls wereexamined for the researeh of the incidence, location, symmetry and grades of cervicalenamel Projections. The results were summarized as follows：　1. The incidence of enamel Projections in maxillary molars was 82.2% and 87.5% in mandibular molars respectively. 2. The grade III enamel Projection was the most Prevalent, and were found almost exclusively on the buccal surface., but grade I enamel Projections occur most often on the lingual surface.3. The order of the incidence in cervical enamel Projections among molars were mandibular first molar, maxillary second molar, mandibular second molar, maxill－ ary first molar, mandibular third molar and maxillary third molar.4. There was a positive, statistieally significant relationship between grade II and III enamel Projections and furcation involvements.5. The incidence of cervical enamel Projec- tions in symmetry was 78.2%.
• 中文關鍵字： --
• 英文關鍵字： --