Methods dip 2% lidocaine or impede narcosis, use the acuity exonerative plane root slot cut endodontium,after drying overlay thin hydrochloride zinc and than using the zinc phosphate to mount.

方法用2%利多卡因浸润或阻,用锐利挖器平根管口切牙髓,拭干后用氢氧化钙盖根髓面,硬固后,薄层氧化锌粘固粉,用磷酸锌粘固粉封洞。