Does MTA affect fiber post retention in repaired cervical root canal perforations?

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.

The effects of root canal perforation repair materials on the bond strength of fiber posts

“…In our study, MTA had no significant effect on the bond strengths between fiber posts and dentin ( p > 0.05). This finding conflicts with a study by Pereira et al, 41 which reported that MTA used for perforation repair in the cervical region of the root canal reduced the bond strength of fiber posts. The authors suggested that the bonding of fiber posts was negatively affected by the reduced area of dentin at the adhesive interface as a result of the root perforation as well as contamination of the dentin adjacent to the perforation area with MTA.…”

“…The authors suggested that the bonding of fiber posts was negatively affected by the reduced area of dentin at the adhesive interface as a result of the root perforation as well as contamination of the dentin adjacent to the perforation area with MTA. 41 The difference in findings between studies may be due to differences in cementation procedures. Whereas Pereira et al 41 performed cementation of fiber posts immediately after MTA application, in our study, cementation was performed 24 h after application of MTA, which has a mean setting time of 140 ± 3 m. By allowing the MTA to set completely, the possibility of any unset MTA particles contaminating the resin cement and affecting bond strength was eliminated.…”

“…41 The difference in findings between studies may be due to differences in cementation procedures. Whereas Pereira et al 41 performed cementation of fiber posts immediately after MTA application, in our study, cementation was performed 24 h after application of MTA, which has a mean setting time of 140 ± 3 m. By allowing the MTA to set completely, the possibility of any unset MTA particles contaminating the resin cement and affecting bond strength was eliminated. Our study found that the fiber posts in the Biodentine subgroups had lower bond strengths when compared to the other subgroups; however, the difference was only significant for the group treated with Ca(OH) 2 (p = 0.024).…”