机用镍钛Hero 642预备磨牙弯曲根管的临床研究

Clinical Study on Preparing Curved Root Canals of Molars with Hero 642 Nickel-titanium Rotary Instruments

目的探讨机用镍钛器械Hero 642应用于磨牙弯曲根管预备的效果。方法选择根管弯曲的磨牙86颗,先采用小号K锉疏通根管,将根尖部预备至15号后,再以机用镍钛器械Hero 642完成根管预备,侧向加压充填根管,根据治疗前后的X线片评价根管预备和充填效果。结果86颗磨牙共有274个根管,264个根管形态良好,无台阶、根尖堵塞、根管偏移及侧壁穿孔等并发症发生。根充恰填256个,8个根管超充,10个根管未能完全扩通,无法到达根尖孔而欠充或做塑化治疗。结论手用锉疏通弯曲根管的根尖段后再以机用镍钛器械Hero 642完成根管预备,可获得良好的成形效果且较少产生并发症。

Objective To discuss the clinical appliance and method of Nickel-titanium （NiTi） rotary instruments Hero 642 in management of fine, curved root canals. Methods 86 molars with curved, fine root canals were chosen. The apical portion of the root canals were dredged by small size hand-use files and enlarged to size 15. Then the NiTi rotary instruments Hero 642 were used for root canal preparation with crown-down technique. All root canals were obturated with lateral condensation method. The efficiency of preparation and obturation was analyzed by radiographs before and after treatment. Results Good outlines were achieved in 264 root canals. The original curvature and flow of root canals were kept well. No transportation, apical blockage, ledge or perforation was happen. The obturation results showed that flush filling was found in 256 root canals, under-filling in 10 root canals, and over-filling in 8 root canals. Conclusion With NiTi rotary instrumentation technique after dredge with small size hand-use files, fine root canals can be prepared effectively and quickly.