G-钻配合超声扩管在钙化根管治疗中的应用

目的:观察G-钻配合超声扩管在高度钙化根管中的应用。方法:选择根管中上段高度钙化患牙14例14个牙,随机分为2组,对照组单纯应用超声扩管仪扩管,实验组先用G-钻扩大根管冠端至根管口下1～3mm,再用超声扩管仪扩管,比较2组根管扩通率。结果:对照组7例均失败,实验组7例扩通5例。结论:G-钻配合超声扩管可以提高钙化根管扩通率。

Repacking practice for G-3 engineering driller power unit with drive shaft of dual channel reverse circulation

In order to satisfy operating requirements for constant core drilling technology in reverse circulation with hollow-through DTH,the power unit of G-3 engineering driller was ameliorated. The new one with dual channel drive shaft, achieved the perfect assemble with transmission structure of the original power unit. It could interconvert according to need by using two sets of drive shafts with direct and reverse circulation. The repacked G-3 engineering driller carried on experiment in the field test in Luanchuan molybdenum mine of Henan, whose effect was very good.