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題 名 | Geometrical Characteristics on Anterior Loop of Inferior Alveolar Nerve in Taiwanese=臺灣人下齒槽神經前迴圈之幾何特徵研究 |
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作 者 | 曾春祺; 楊炳德; 彭玉秋; 毛念平; 黃國精; 陳俊榮; 溫敏杰; | 書刊名 | 臺灣牙周病醫學會雜誌 |
卷 期 | 13:1 2008.03[民97.03] |
頁 次 | 頁11-21 |
分類號 | 416.93 |
關鍵詞 | 前迴圈; 下齒槽神經; 頦孔; 下顎神經管; 牙科電腦斷層; |
語 文 | 英文(English) |
中文摘要 | 背景:下齒槽神經前迴圈是指頦神經至頦孔的途徑。植牙手術需避開以免傷到下齒槽神經。目前的平面X光片技術不容易分辨下齒槽神經前迴圈。 目的:本研究的目的是在利用電腦斷層影像來探討台灣人的下齒槽神經前迴圈的幾何構造;結果可供下顎後牙區植牙的臨床資訊參考。 材料與方法:收集100位台灣成人包括50位男性和50位女性,平均年齡46.7±12.6歲來量測前迴圈:步驟包括(l)下顎電腦斷層影像,解析度為0.3 mm;(2)將影像立體重組可以得到tomographic and axial section images:(3)確認及量測前迴圈的各項指標:(4)所得數據加以統計分析。 結果:1.兩項重要指標角度(1)頰舌側方向角度為39.1±9.8度;(2)向後迥轉近遠心方向角度為25.3±14.6度。 2.前迴圈的距離為4.4±1.8 mm;男女性有統計上的差別,左右兩側並沒有統計上的差別。 結論:由電腦斷層影像的幾何特徵研究發現台灣成人確實有前迴圈,植牙手術為了安全起見至少需離閉頦孔前緣5 mm。前迴圈的距離男女有別,左右側無差別。 |
英文摘要 | Background. Anterior loop is referred to as the mental nerve running towards the mental foramen in anterior, superior, and lateral course. For dental implant surgery in mesial mandible region, the location of the anterior loop should be accurately identified to avoid the possible nerve damage. However, the current planar radiograph technique has poor visibility in the anterior loop region. Objective. The objective of this study is to investigate the geometrical characteristics on anterior loop of inferior alveolar nerve in Taiwanese with using a CT scanner. The results of the study can provide a clinical information for implant surgery in anterior mandible. Methods. 100 Taiwanese adults including 50 males and 50 females with average age of 46.7±12.6 years were chosen to perform measurement of the anterior loop. The procedures are as follows: (1) Scan the mandible region using a computed tomographic scanner. The image resolution is 0.3 to 0.4 mm. (2) Perform multiplannar reconstruction to obtain the tomographic and axial section images. (3) Identify and measure the geometrical parameters of the anterior loop. (4) Perform statistical analysis on the collected data. Result. The two important angles characterizing how the anterior loop of the mental nerve runs toward the mental foramen at the labial side were analyzed from the measured data. The first angle, the inclined angle in the lingual-labial direction, was measured as 39.1±9.8 degree. The second angle, the loopback angle in the mesio-distal direction, was measured as 25.3±14.6 degree. The loopback extension length, characterizing the distance from the mental foramen to the branch point of the anterior loop, was measured as 4.4±1.8 mm. Statistical analysis shows that there are significant difference between males and females (p<0.05) and no difference between right side and left side (p>0.05). Conclusion. For safety reasons, dental implant should be placed at least 5 mm anterior to mental foramen. There exists significant difference between males and females in their geometrical characteristics of the anterior loop, however, there is no difference between right side and left side. |
本系統中英文摘要資訊取自各篇刊載內容。