Seiten: 103-110, Sprache: EnglischMoubarak, Carla Zogheib / Naaman, Alfred / Gergi, Richard / Medioni, Etienne
Aim: To compare the cross-sectional area of sealer plus voids of gutta-percha/AH Plus and Resilon/ RealSeal following root canal preparation with rotary nickel-titanium ProTaper instruments and different apical preparation sizes.
Materials and Methods: Forty-eight extracted maxillary anterior teeth were instrumented with the ProTaper system to apical sizes of 25 (F2), 40 (F4) and 60 (F5 + K-files) (n = 16 each). The teeth were divided into six groups (n = 8) for obturation as follows: group 1, apical preparation size 0.25 mm + gutta-percha/AH Plus sealer; group 2, apical preparation size 0.25 mm + Resilon/ RealSeal; group 3, apical preparation size 0.40 mm + gutta-percha/AH Plus sealer; group 4, apical preparation size 0.40 mm + Resilon/RealSeal; group 5, apical preparation size 0.60 mm + guttapercha/ AH Plus; group 6, apical preparation size 0.60 mm + Resilon/RealSeal. All root canals were filled using the warm vertical compaction technique. Horizontal sections were obtained every 1 mm, up to 3 mm from the apical foramen. Samples were observed by scanning electron microscopy under x200 magnification. Sections were digitally photographed under a stereomicroscope and the images were transferred to a compatible PC for image analysis. Using a computer program, the surface areas of voids were calculated and compared statistically for different preparation sizes and obturation systems at all levels, using the Kruskal-Wallis test with Sidak correction and Mann- Whitney U test (P < 0.05).
Results: Comparisons within each obturation group (gutta-percha/AH Plus and Resilon/RealSeal) showed the presence of voids, but there were no significant differences between the two groups for apical preparation sizes of 25 and 40 (P < 0.05), irrespective of the level of sectioning. The only significant difference was obtained for canals prepared to an apical size 60: canals obturated with Resilon/RealSeal showed significantly more voids than those filled with gutta-percha/AH Plus, especially at the 3-mm level.
Conclusions: Resilon/RealSeal did not achieve better results in terms of sealing ability in the apical third when compared to the conventional obturation materials gutta-percha/AH Plus.
Schlagwörter: AH Plus, gutta-percha, RealSeal, Resilon, sealer area