title: Orthograde ultrasonic retrieval of root canal obstructions.
authors.forename: B L
authors.initials: BL
authors.lastname: Chenail
authors.forename: P E
authors.initials: PE
authors.lastname: Teplitsky
mesh_terms: D003786:Dental Pulp Cavity; D005547:Foreign Bodies / Q000628:therapy*; D006801:Humans; D012390:Root Canal Therapy / Q000009:adverse effects* / Q000295:instrumentation; D014464:Ultrasonic Therapy / Q000379:methods*