Hand versus ultrasonic instrumentation: its effect on canal shape and instrumentation time.
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D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D006801:Humans; D008963:Molar; D010865:Pilot Projects; D012390:Root Canal Therapy / Q000295:instrumentation* / Q000379:methods; D013997:Time Factors; D014464:Ultrasonic Therapy / Q000295:instrumentation*