Removal of Endosequence BC/CPoint endodontic fillings in curved root canals using rotary or reciprocating instruments

摘要: Objective This study used micro-CT to evaluate the amount of remaining filling material in curved root canals obturated with Endosequence BC Sealer/Cpoint or AH/gutta-percha after a rotary or reciprocating retreatment. Methods Sixty mesiobuccal canals of maxillary molars were instrumented up to MTwo# 35.04. Samples were randomly assigned to four groups (n= 15): canals from G1 and G2 were filled with AH/gutta-percha, and canals from G3 and G4 were filled with BC/Cpoint. Filling material was removed using rotary or reciprocating instruments: G1 and G3: R25 Reciproc+ re-shaping with R40; and G2 and G4: ProTaper Universal Retreatment system+ re-shaping with MTwo 40.06. Micro-CT was used to measure the remaining amount of filling material (mm3), for the whole canal, and for each third, in two moments: 1) after filling removal and 2) after canal re-shaping. Results After filling removal, BC/CPoint remained more into the canal than AH/Gutta-percha when the whole canal (29.92% x 19.25%, p= 0.0290) and the apical third were analyzed. After re-shaping, BC/CPoint remained more than AH/Gutta-percha only in the apical third. Rotary or reciprocating retreatment protocols removed filling material without difference for AH/gutta-percha (G1 and G2: p> 0.05) and BC/CPoint (G3 and G4: p> 0.05). Conclusion BC/Cpoint is more difficult to be removed from curved root canals than AH/gutta-percha. Reciprocating and rotary instruments have similar ability to remove filling material.