title: Influence of Operator's Experience on the Shaping Ability of Protaper Universal and Waveone Systems: A Comparative Study on Simulated Root Canals.
abstract: OBJECTIVE
  To assess the influence of operator experience on: shaping and centering ability, mean preparation time and presence of canal aberrations of ProTaper Universal and WaveOne systems on simulated root canals.
  
  
  METHODS
  Sixty S-shaped canals in resin blocks were assigned to four groups (n=15 for each group). Group1 (Experienced operator, ProTaper), Group2 (Experienced operator, WaveOne), Group3 (Inexperienced operator, ProTaper), Group4 (Inexperienced operator, WaveOne). Photographic method was used to record pre- and post-instrumentations images. After superimposition, it has been evaluated presence of canal aberrations and differences in shaping and centering ability between groups.
  
  
  RESULTS
  WaveOne system produced a lower amount of canal aberrations both in the hand of expert than inexpert operators. However, a WaveOne instrument breakage occurred in the hands of an inexperienced operator. No differences have been found in the evaluation of shaping ability with both systematics. Operator's experience doesn't influence the shaping ability of ProTaper and WaveOne systems.
  
  
  CONCLUSIONS
  Experience factor could influence the centering ability in the use of both the systematics. However, WaveOne Primary reduce the mean preparation time and the presence of canal aberrations.
authors.affiliation: Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Troiano
authors.affiliation: Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy.
authors.forename: Mario
authors.initials: M
authors.lastname: Dioguardi
authors.affiliation: Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy.
authors.forename: Armando
authors.initials: A
authors.lastname: Cocco
authors.affiliation: Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Giannatempo
authors.affiliation: Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy.
authors.forename: Luigi
authors.initials: L
authors.lastname: Laino
authors.affiliation: Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy.
authors.forename: Domenico
authors.initials: D
authors.lastname: Ciavarella
authors.affiliation: Department of Endodontics, University of Turin Dental School, Turin, Italy.
authors.forename: Elio
authors.initials: E
authors.lastname: Berutti
authors.affiliation: Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Lo Muzio
keywords: Centering ability; Endodontic; ProTaper; Reciprocating; Shaping ability; WaveOne