Issue V10N02 | Year 2020 | Editorial Original Article | Pages 34 to 41
Objective: To evaluate the influence of different protection plugs over the remaining obturation after post space preparation, on cast metal post retention. Methodology: Fifty bovine teeth were decoronated and root canals were manually instrumented up to a Kerr 80 file and then obturated. A Largo drill was used to partially clear the canal at a 10mm depth. Groups were divided, according to different plug materials (n=10): Group I (control, with no plug), Group II (Coltosol® plug), Group III (Sealapex® + zinc oxide in putty-like consistence plug), Group IV (ethyl-cyanocrylate plug) and Group V (zinc phosphate plug). A layer with 1mm of thickness of different plug materials (Groups II, III, IV and V) was adapted over the remaining obturation and specimens were sealed and then stored in 100% humidity for 7 days. After the root canal was molded, cast metal posts were manufactured and cemented with zinc phosphate. The specimens remained in a humid chamber for 45 days before traction test was performed using a universal testing machine. The values were shown in Megapascal (MPa) and submitted to the ANOVA test and Tukey’s T est (P<.05). Results: Ethylcyanoacrylate reduced cast metal post retention (P<.01), without differences from the other groups (P>.05), similar to control. Conclusion: The obturation protection with plugs made of ethyl-cyanoacrylate hindered retention when cast metal posts are cemented with zinc phosphate, whereas Sealapex® with added zinc oxide, hardened zinc phosphate cement or Coltosol® do not interfere in the adhesiveness factor.
Bueno CRE, Valentim D, Araújo GS, Jacinto RC, Gomes Filho JE, Cintra LTA, Dezan Junior E. In vitro assessment of the influence of different protection plugs over obturation remnant space, after post preparation, on the retention of cast metal posts. Dental Press Endod. 2020 May-Aug;10(2):34-41.