作者用次氯酸钠冲洗髓室后判定磨牙根分又开放副根管的发生率。用100颗离体磨牙,每5分钟用5.25％次氯酸钠冲洗髓室1次,为时1 h,将根分叉表面浸于0.5％碱性品红内24 h,看有染料进入髓室底则表明根分叉区有开放副根管。作者等用此法成功地证明该区开放副根管发生率为57％±19％。当X线片显 The authors used sodium hypochlorite rinse the pulp chamber to determine the molars root opening and the incidence of secondary root canal. With 100 off-molars, every 5 minutes with 5.25% sodium hypochlorite rinse the pulp chamber 1 time 1 h, the root bifurcation surface immersed in 0.5% alkaline fuchsine 24 h, see the dye into the pulp chamber at the end of the Show root bifurcation open root canal. Using this method, the authors successfully demonstrated that the incidence of open accessory canals in this area was 57% ± 19%. When the X-ray was significant