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2%卡因浸润或阻滞麻醉,锐挖器平根管口切牙髓,拭干氢氧化钙糊剂盖根髓面,硬,薄层氧化锌粘粉,磷酸锌粘粉封洞。