Research and EducationRetentive strength of fiber-reinforced composite posts with composite resin cores: Effect of remaining coronal structure and root canal dentin conditioning protocols
Section snippets
Material and Methods
After gaining informed consent from patients with periodontitis and teeth with grade III mobility, 150 extracted human maxillary anterior teeth were obtained for this study. Approval to use human teeth was obtained from the Research Ethics Committee at the Faculty of Dentistry, Mansoura University, Egypt. Power analysis was performed before conducting this study (SAS/STAT v12.1 software; SAS Institute) to determine the number of specimens required in each experimental group to determine
Results
The mean values and standard deviations of retentive forces (N) obtained for the fiber-reinforced posts bonded to differently conditioned root canal dentin substrates and the 3 remaining coronal structures are presented in Table 1 and Figure 3. The highest mean retentive force (N) value was recorded with the remaining coronal structure of 2 mm in group Q (374.7 ±29.8 N), while the lowest mean value was obtained from group C (205 ±11.7 N). Root canal surface conditioning significantly affected
Discussion
The results of this in vitro study support the rejection of the null hypothesis that root canal dentin conditioning would not affect the retention of fiber-reinforced posts with composite resin cores luted to different amounts of remaining coronal structure with self-etch adhesive luting resin cement. The results of this study showed significant influence of the amount of remaining coronal structure and root canal dentin surface conditioning on the retention of the fiber-reinforced composite
Conclusions
From this in vitro study, the following could be concluded:
- 1.
Luting fiber-reinforced composite resin posts with self-adhesive resin cement after root canal dentin conditioning with either a combination of 2% CHX with 17% EDTA and a surfactant solution or 17% EDTA produced significantly higher retention values compared with those with dentin conditioning with 37% phosphoric acid.
- 2.
The preservation of the remaining coronal structure of endodontically treated teeth increased the retentive strength of
Acknowledgments
The authors thank Dr Walid El-Zordek for help in the preparation of this manuscript.
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2017, Journal of Prosthetic DentistryCitation Excerpt :Our results indicate that the increase in post space does not significantly affect the bond strength of fiber-reinforced composite resin posts. Because dislodgement of the post is a frequent mode of failure with fiber posts, push-out bond strength is an important clinical factor.28-31 In addition, the bond strength of fiber post contributes to the reinforcement of roots during endodontic treatment.