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目的:寻找一种预备C形根管的有效器械,提高下颌第二恒磨牙的治愈率。方法:选用80颗具有C形根管的下颌第二恒磨牙,选择四种器械进行根管预备,第一组用不锈钢K锉,第二组用不锈钢K锉和手用镍钛器械,第三组用机用镍钛器械,第四组用超声根管治疗仪,预备中均用3%双氧水和生理盐水交替反复冲洗根管,预备后用Vitapex糊剂和牙胶尖冷侧压方法充填根管,观察根充后X线片和根尖微渗漏情况,评价充填效果。结果:四种器械根充后微渗漏有明显差异(P<0.05)。结论:不锈钢K锉和手用镍钛器械联合应用及超声根管治疗仪为预备C形根管的有效器械。
Objective: To find an effective instrument for preparing C-shaped root canal and improve the cure rate of mandibular second permanent molars. Methods: Eighty permanent mandibular permanent molars with C-shaped root canal were selected. Four kinds of instruments were selected for root canal preparation. The first group was treated with stainless steel K-file, the second group with stainless steel K-file and hand nickel-titanium device, the third In the fourth group, ultrasonic root canal treatment instrument was used in the fourth group. The root canal was alternately and repeatedly rinsed with 3% hydrogen peroxide solution and normal saline. After preparation, the root canal was filled with Vitapex paste and gutta percha cold lateral pressure method Tube, observed after root canal X-ray and apical microleakage, evaluate the filling effect. Results: There was a significant difference in microleakage between the four devices after root filling (P <0.05). Conclusion: The combination of stainless steel K-file and hand-operated NiTi instrument and ultrasonic root canal therapy instrument are effective instruments for preparing C-shaped root canal.