下领尖牙双根1例
发表时间：2014-07-10 浏览次数：891次
患者，男性，66岁。右侧下领尖牙松动11度，牙尖磨耗明显，颊侧牙颈部楔状缺损，齿民萎缩，牙根暴露5-6 mm，牙周袋深约 4}5 mm。局麻下拔除患牙，患牙为颊舌两根，颊根(长约14.50 mm)稍长于舌根(长约13.90 mm)，较舌根粗壮，颊根较弯，舌根比较直，冠长为11.30 mm.离体牙X线片显示两根管，为双根双管型，两个根管口(图1).据报道，下领尖牙双根管的出现率约1.7%一15%[1-4]甚至有出现2根3根管的报道[5]. Pecora等[5]研究了830例离体下领尖牙，98.3%为单根，92.2%出现1个根管和1个根尖孔，4.9%为2 个根管和1个根尖孔，2个根管和2个根尖孔者仅占1.2%。关于牙根方向:51%是直的，14.6 %偏近中，25.5%偏远中，3. 2 % 偏颊侧，4.4%为C形。该牙平均长25.5 mm, (20.3-32.8 mm). Sharma[6]研究65颗人下领尖牙发现所有2个根的下领尖牙都 有2个根管。颊侧根最大和最小长度分别为26.7 mm和17.9 mm,舌根最大和最小长度分别为27.2 mm和17.1 mm. 47.7%的下领尖牙颊侧根大，43.1%的h领尖牙颊舌根大小一致，9.2%的舌根大于颊侧根。我们拔除的离体下领尖牙根管结构为非常少见的2个根管和2个根尖孔,2根近乎平直。
参考文献
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