1. The dependence of the results of pulp therapy on certain factors: an analytical study based on radiographic and clinical follow-up examinations;Strindberg;Acta Odontol Scand,1956
2. Guidelines for the prevention of fracture of root canal instruments;Grossman;Oral Surg Oral Med Oral Pathol,1969
3. The Washington study;Ingle,1965
4. Relationship of broken root canal instruments to endodontic case prognosis: a clinical investigation;Crump;J Am Dent Assoc,1970
5. Filling root canals with files. Radiographic evaluation of 304 cases;Fox;NY State Dent J,1972