【摘要】 目的研究下颌第二恒磨牙C型根管的发生率及分型特点。方法选取1164例患者,进行锥形束CT(cone-beam computed tomography,CBCT)扫描,研究C型根管的发生率及分型特点。结果下颌第二恒磨牙C型根管发生率为39.95%。具有C型根管的患者双侧下颌第二恒磨牙均为C型根管的发生率为69.68%。男性、女性C型根管发生率分别为33.14%和45.54%(P<0.001)。不同类型C型根管在男性、女性的发生率分别为41.76%、28.57%、29.67%和52.12%、20.61%、27.27%(P<0.05)。男性、女性左右侧C型根管同型发生率为51.35%和76.06%(P<0.001)。结论CBCT可清晰显示根管影像,C型根管的发生率较高并具有一定的对称性;女性C型根管及双侧同型C型根管的发生率明显高于男性;C1型根管发生率最高,C2、C3两种类型发生率无差异。更多还原

【Abstract】 Objective To study the incidence and the canal configuration of the C-shaped root canal of the mandibular second permanent molars. Methods CBCT images of 1164 mandibular second permanent molars were collected. The incidence and the canal configuration of the C-shaped canals were recorded. Results 39.95of the mandibular second permanent molars were C-shaped root canal. In these C-shaped root canal samples, 69.68were both-sides C-shaped root canal. The incidence of males and females were 33.14and 45.54%(P <0.001). The distribution of type-1, type-2 and type-3 in males and females were 41.76%, 28.57%, 29.67and 52.12%, 20.61%,27.27respectively(P <0.05). The incidence of the same type of the left-and-right side in males and females were51.35and 76.06%(P <0.001). Conclusion The application of the CBCT can help to facilitate root canal treatment.Mandibular second permanent molars commonly have a high prevalence for C-shaped root canal and both sides are symmetrical to some extent. Females are more likely to have C-shaped root canal.The incidence of the same type of the left-and-right side of females is much higher than males.The type-1 shows a higher prevalence.The incidence of the type-2 and type-3 shows no statistical significance.更多还原