TY  - RPRT
TI  - Failed root canals: the case for apicoectomy (periradicular surgery).
AU  - Thomas von Arx
PY  - 2005
DO  - 10.1016/j.joms.2005.02.019
UR  - https://pubmed.ncbi.nlm.nih.gov/15944982/
ID  - 15944982
ER  -