1. Further observations with hypodermic needles broken during the administration of oral local anesthesia: a report of sixty-five cases;Blum;Dent Cosmos,1924
2. Oral roentgenographic diagnosis;Stafne,1969
3. Migration of a broken anesthetic needle: report of a case;Crouse;S C Dent J,1970
4. Broken needles following mandibular injections;Dudani;J Indian Dent Assoc,1971
5. Recovery of broken needles;Fraser-Moodie;Br Dent J,1958