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目的:统计分析乌鲁木齐地区下颌第二磨牙融合根发生率及对称性,为下颌第二磨牙根管治疗提供解剖依据。方法:按照融合牙根及分开牙根的诊断标准,3名医生对351例患者X线曲面断层片双侧下颌第二磨牙牙根进行诊断,记录牙根的对称性。结果:351例中130例男性牙根对称120例,非对称10例;221例女性牙根对称195例,非对称26例,不同性别牙根对称性比较差异无统计学意义(P>0.05)。牙根对称男性中11例为融合根、109例为分开根,女性中35例为融合根、160例为分开根,牙根融合且对称者女性明显多于男性(P<0.05)。融合根患者牙根对称46例(56.1%)。融合根牙数128颗(18.2%),分开根574颗(81.8%)。结论:乌鲁木齐地区下颌第二磨牙融合根及对称性发生率较高,融合根对称性发生率女性多于男性。
OBJECTIVE: To statistically analyze the incidence and symmetry of the fusion root of the second molar in the area of Urumqi, and to provide anatomic evidence for the root canal treatment of the second molar. Methods: According to the diagnostic criteria of fused root and separated root, three doctors diagnosed the root of bilateral second molar root of X-ray slice in 351 patients and recorded the root symmetry. Results: There were 120 cases of root symmetry in 130 cases and 10 cases of asymmetry in 351 cases. There were 195 cases of root symmetry in 221 cases and 26 cases of asymmetry. There was no significant difference in root symmetry between different sex groups (P> 0.05). Among the root-symmetrical men, 11 were fusion roots, 109 were divided roots, 35 were fusion roots and 160 were divided roots. There were significantly more females than those with symmetry in root fusion (P <0.05). 46 patients (56.1%) were rooted symmetrically. The number of fused roots was 128 (18.2%) and 574 (81.8%) were separated roots. Conclusion: There is a higher incidence of fusion root and symmetry in the mandibular second molar in Urumqi. The incidence of fusion root is more than that in male.