Placement of a sealing material into the apical foramen of a dental root from the apical end. ... (05 Mar 2000) ... 
(ret″ro-fil´ing) a method of root canal therapy in which the canal is filled from the apex, which has been surgically exposed.
Type: Term Pronunciation: ret′rō-fil′ing Definitions: 1. Placement of a sealing material into the apical foramen of a dental root from the apical end.