Abstract
This study evaluated the effect of mineral trioxide aggregate (MTA) on the retention of fiber posts in repaired root canal perforations. Ten-millimeter post spaces were prepared in 60 endodontically treated bovine incisors. Root perforations were created in half of the root canals in the cervical area prior to being filled with white MTA-Angelus. Fiber posts were luted into the root canals with two self-adhesive (RelyX Unicem or Set) or self-etching (Panavia F) resin cements. The posts were submitted to a pull-out test, and the data were submitted to two-way ANOVA and Tukey's post hoc tests (α = 0.05). The fiber posts exhibited reduced retention in MTA-repaired root canal perforations, regardless of the type of resin cement that was used (p < 0.001). Self-adhesive resin cements provided higher bond strength values than Panavia F, while no difference was observed between RelyX Unicem and Set (p > 0.05). The presence of MTA in repaired root perforations negatively affected post retention. In addition, self-adhesive cements seemed to be the best option to lute fiber posts within a root canal in these cases.
Highlights
Mineral trioxide aggregate (MTA), first reported in the early 1990s,1 has been widely used for perforation repair
This study evaluated the effect of mineral trioxide aggregate (MTA) on the retention of fiber posts in repaired root canal perforations
Regardless of the resin cement used, the highest mean bond strength values were observed in the absence of an MTA-repaired perforation
Summary
Mineral trioxide aggregate (MTA), first reported in the early 1990s,1 has been widely used for perforation repair. MTA is a bioactive cement that presents satisfactory biocompatibility, antibacterial effects, proper radiopacity, and the ability to set, even in the presence of blood.[1,2,3,4] In addition, the setting expansion of MTA improves the sealing of perforation margins.[5] Clinically, high success rates for root perforation repairs using MTA have been reported.[6,7] the clinical success of root repair requires placement of a proper coronal restoration to reestablish aesthetics and masticatory function. The tooth crown is extensively destroyed, and the use of an intraradicular retainer is required. It has been demonstrated that an initial debonding of the luted post from the root canal increases the stress on the root and the risk of a post and/or core fracture.[13]
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