Is the bonding of self-adhesive cement sensitive to root region and curing mode?

Abstract

Objectives To evaluate the influence of two curing techniques on the degree of conversion (DC) of resin cements and on bond strength (BS) of fiber posts in different regions of root dentin.Material and Methods Twenty single-rooted premolars were endodontically treated, and the post spaces were prepared. The roots were randomly divided into two groups (n=10), according to the activation mode of the resin cement RelyX™ U200 (3M ESPE Saint Paul, MN, USA): conventional (continuous activation mode) and soft-start activation mode (Ramp). The posts (WhitePost DC/FGM) were cemented according to the manufacturer’s recommendations and, after one week, the roots were cross-sectioned into six discs each of 1-mm thickness, and the cervical, medium, and apical thirds of the root canals were identified. The DC was evaluated under micro-Raman spectroscopy and the BS was evaluated by the push-out test. The data were analyzed by two-way ANOVA and Tukey’s test (α=0.05).Results Neither the activation mode nor the root regions affected the DC of the resin cement. Higher BS was achieved in the soft-start group (p=0.036); lower BS was observed in the apical third compared to the other root regions (p<0.001). Irrespective of the activation mode and root region, the mixed failure mode was the most prevalent.Conclusion The BS of fiber posts to root canals can be improved by soft-started polymerization. The DC was not affected by the curing mode.

Effect of a filled adhesive as the desensitizer on bond strength of “Self‐Adhesive Cements To” differently severity of fluorosed dentin

“…Regarding failure modes, in RXU group, mixed failure was predominant regardless of P&B NT pretreatment, which agreed with the results of those who used self‐adhesive resin cements (Boing, Gomes, Gomes, Reis, & Gomes, ; Kim, Cho, Roh, & Shin, ). Pilo et al () have reported predominant failure mode for RelyX U200 was adhesive cement‐crown and the classification was not identical with this study.…”

Influence of the depth of intraradicular dentin on the pushout bond strength of resin materials

“…Fiber posts are generally indicated to restore teeth with excessive loss of dental structure and appropriate endodontic treatment . The choice of this material is based on esthetic characteristics and increased retention for the final restoration; this is applicable when the remaining tooth structure can no longer provide adequate support for a restoration .…”

Effect of the application of different concentrations of EDTA on the adhesion of fiber posts using self-adhesive cements

“…Because self-adhesive resin cements show an affinity for the composition of composite resins, in addition to containing an unfavorable factor (e.g., C-factor). 27 The cervical dentinal tubules are larger than in the middle and apical portions, and root canal diameter is larger as well. 28 This may possibly explain the conflicting results with the literature.…”