Two surgical cases are presented in which retrograde instrumentation of the root canal was accomplished with sonic or ultrasonic instruments. The canals were obturated from a retrograde direction with thermoplasticized gutta-percha and root canal sealer. Success of these treatment approaches is attributed to thorough debridement and satisfactory obturation with equipment only recently available in the marketplace. © 1987 The American Assocation of Endodontists.
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