Obturation artifizieller Seitenkanäle nach verschiedenen Sealerplacement-Techniken

1.1 Aim The anatomical complexity of the root anatomy and the versatile morphology configuration of a tooth, even let the experienced endodontist always facing a problem to achieve a solid and adequate obturation of this system which in-cludes multiple foramina, accessory and lateral canals. Accomplishing the assumption for approaching apical tissue healing it is an important aspect to provide a hermetic seal to avoid the possibility of a pathway for bacteria and products of tissue degeneration between the canal and the surrounding tis-sues. For that reason, filling lateral canals should be important as well as fill-ing the main canal to avoid bacterial reinfection. The aim of this in vitro study was to assess the efficacy of different placement techniques in terms of sealer penetration and homogenity of filling simulated lateral canals. 1.2 Method Crowns of 60 single rooted, human extracted teeth were removed and the roots were splitted longitudinally, reassembled and embedded into polyure-thane (Biresin, Sika N.V, Utrecht, Netherlands). 4 groups were designed (n=15): group 1: EZ-Fill bi-directional spiral (EDS, South Hackensack, New Jersey, USA) in rotary motion, group 2: K-reamer size 70 (Dentsply Maillefer, Ballaigues, Switzerland) in rotary motion, group 3: lentulo spiral size 40 (VDW, Munich, Germany) in rotary motion, group 4: ROEKO CanalBrush (Coltène/Whaledent, Altstätten, Switzerland) in rotary motion. Root canals were prepared to size 80 taper .02 using FlexMaster (VDW, Mu-nich, Germany) and finally Mity Roto files (Loser & Co, Leverkusen, Germa-ny). Than a groove 6 mm in length and 2 mm deep was prepared in one root half. On the second one 4 holes were prepared 2 mm, 4 mm, 6 mm and 8 mm from apex and 2 mm in depth. Than root canals were filled with AH Plus (Dentsply DeTrey, Konstanz, Germany) according to the different placement technique. Allowing the sealer to set completely after 48 hours, digital x-ray (Digora, So-redex, Helsinki, Finland) were made to gauge the depth of penetration and homogenity. 1.3 Results No significant differences were found in rotary placement techniques. Coro-nal placed grooves performed better (33,3 % were totally penetrated) than apical ones (20 % were totally penetrated). 1.4 Conclusion On closer examination no significantly differences of rotary sealer application methods can be found.