Giuliani, Valentina Efficacy of ProTaper universal retreatment files in removing filling materials during root canal retreatment. [electronic resource] - Journal of endodontics Nov 2008 - 1381-1384 p. digital Publication Type: Comparative Study; Evaluation Study; Journal Article ISSN: 1878-3554 Standard No.: 10.1016/j.joen.2008.08.002 doi Subjects--Topical Terms: Dental AlloysDental InstrumentsHumansNickelRetreatmentRoot Canal Filling MaterialsRoot Canal Preparation--instrumentationStatistics, NonparametricTitanium