當牙齒拔除之後常常會造成齒槽脊的吸收，特別是在有嚴重的牙周病情況下，齒槽脊的吸收更加明顯。因 此及時的齒槽窩洞的維護，能夠創造出將來人工植牙良好的基礎，並且提供牙科補綴在美觀與功能上更多的需求。目前在齒槽窩洞維護的材料與技術上，有許多不同 的方法。我們提出一位在左下顎第一大臼齒頰側有大量 骨質破壞的病例，在牙齒拔除之後立即進行齒槽窩洞的維護，放入海綿狀人工膠原Teruplug® (Bovine collagen Terumo Corporation, Japan.)來促進骨頭生長，並且以鈦 金屬膜作為軟組織的阻隔。在術後六個月，重新撥開原 先的受植區，結果發現人工膠原已經由新生骨所取代，同時拿掉鈦金屬膜後立即植入4.5x10mm (FRIADENT, Mannheim, Germany)的人工植牙，經過三年的追蹤，發 現骨整合的情況也相當成功。根據這樣臨床上的發現，人工膠原可能在齒槽窩洞拔牙後的維護上，扮演著一種有效的輔助方法。

Alveolar ridge resorption is frequently determined after tooth extraction, especially when severe periodontitis is involved. Prompt postextraction ridge preservation can create a good base for implant placement and provide more esthetic and functional demand in prosthesis. Various types of grafting materials and techniques have been recommended in alveolar ridge preservation. We report a postextraction case with large buccal bone defect of the left mandibular first molar. Socket preservation procedure was carried out by a collagen sponge insertion and a titanium membrane barrier. Six months later, a re-entry procedure was performed and the collagen had been completely substituted by new bone. A 4.5x10mm implant was placed and osseointegrated successfully during 3-year follow-up. This clinical funding may suggest that artificial collagen represents a useful adjunct in the postextraction ridge preservation.