1. Endodontics;Nicholls,1977
2. Endodontic practice;Grossman,1981
3. Endodontic practice;Grossman,1981
4. Tooth discoloration induced by endodontic sealers [Abstract 190];van der Burgt;J Dent Res,1985
5. Intrinsic and extrinsic discoloration of the dentition;Vogel;J Oral Med,1975