Regional bond strengths to root canal dentin of fiber posts luted with three cementation systems

Abstract

This study evaluated the influence of the cementation system on the regional push-out bond strength and failure pattern of fiber posts to radicular dentin. The roots of 48 extracted human incisors were prepared and divided into 3 groups (n=16), according to the cementation system: AdperScotchbond Multi-Purpose + resin cement RelyX ARC (SBMP+ARC); Adper SingleBond 2 + RelyX ARC (SB+ARC) and; RelyX U100 self-adhesive resin cement (U100). The posts were cemented as per manufacturer's instructions for each cementation system. After 1 week, the roots were sectioned transversely into 6 discs. Two discs were obtained from the cervical, middle and apical thirds and the push-out test was carried out. The failure pattern was examined on all debonded specimens. The data were analyzed by two-way repeated measures ANOVA and Tukey's test. When U100 was used, no statistically significant difference (p>0.05) was observed among the different root regions. Statistically higher push-out bond strength values were detected in the cervical third for SBMP+ARC and SB+ARC (p<0.05). The U100 showed significantly more mixed failures than SBMP+ARC in the apical third (p<0.05). In conclusion, the self-adhesive cement RelyX U100 was the only cement not sensitive to the root canal region.

Effect of Operator Experience on the Outcome of Fiber Post Cementation With Different Resin Cements

“…The high BS values observed for U100 in this study and in others 1,[7][8][9]28,[35][36][37] can be attributed to the chemical interaction between monomer acidic phosphate groups and dentin/enamel hydroxyapatite 17 and to low shrinkage of the material, 38,39 leading to closer contact of the resin cement with the root canal walls and higher frictional resistance. 40,41 Unfortunately, there is no consensus in the literature with regard to the superiority of this material when compared with conventional bonding strategies.…”

“…It is speculated that the low number of operators (only one in each experimental condition) and specimens used by the authors reduced the power of the study to an extent that prevented the authors from observing a significant effect of the operator's experience on the BS. As data from push-out BS present high standard deviations, usually exceeding 50% of the means, 1,5,6,16,28,34 the sample size should be high enough to detect subtle differences between groups.…”

The Influence of a Translucent Fiberglass Post on the Polymerization of Dual Cure Resin Cement Analyzed by Electron Paramagnetic Resonance

“…In clinical situations where there is great coronal destruction, either by caries or dental trauma, both endodontic treatment and the use of a post and core technique are necessary to retain a restorative material [1][2][3][4] . When compared to a traditional cast metal post, prefabricated fiberglass posts gained popularity due to their aesthetics, bonding to radicular dentin tissue and restorative material, low cost, non-corrosiveness, and having a modulus of elasticity similar to dentin, reducing the probability of radicular fracture 1,5 .…”

Influence of Geometrical Configuration of a Translucent Fiberglass Post on the Polymerization of a Dual Cure Resin Cement Analyzed by EPR Spectroscopy

“…Intraradicular posts manufactured from a composite of glass fibers and epoxy resin are often used in the treatment of teeth for the purpose of assisting the retention of the restoration material [1][2][3][4]. The fiberglass post became popular in dental practice because of its physical properties, which are very similar to dentin, for its adhesion to root dentin and its esthetic qualities, which differ considerably from the cast metal post [5].…”