In the restoration of endodontically treated teeth, fiber-reinforced posts cemented with self-adhesive resin cements are a widely accepted solution.
However, the success of this procedure largely depends on the interaction between the cement, the post, and the dentin surface.
This post explores the current scientific evidence on how intraradicular dentin treatments and post surface preparation impact retention and long-term outcomes.
Intraradicular Dentin Surface Treatments
The type of irrigant or chemical agent used on the dentin surface can significantly influence bond strength.
A Brazilian study demonstrated that using 17% EDTA before cementation led to lower retention values compared to other treatments like 11.5% polyacrylic acid or 5% sodium hypochlorite.
These results suggest that certain chelating agents might negatively affect the interaction between dentin and self-adhesive resin cements.
Surface Preparation of Fiber Posts
Proper conditioning of the fiber post surface is equally important.
Evidence supports the application of a silane coupling agent, which enhances the chemical bonding between the resin cement and the post (RSD Journal, 2022).
Moreover, air abrasion with aluminum oxide has been shown to improve surface roughness and increase mechanical retention (PMC, 2021).
Timing of Post Space Preparation
When the post space is prepared can also impact retention. A clinical comparison between immediate and delayed post space preparation revealed that delayed preparation resulted in stronger adhesive bonding (IJDR, 2015).
This is likely due to improved apical seal stability and a drier, more favorable bonding environment.
► DENTAL BOOK: Contemporary Restoration of Endodontically Treated Teeth: Evidence-Based Diagnosis and Treatment Planning
Clinical Recommendations
Based on current literature, the following guidelines can improve the performance of fiber post restorations with self-adhesive resin cements:
✔ Avoid 17% EDTA as the final irrigant when using self-adhesive resin cements.
✔ Use silane to enhance the chemical bond between fiber posts and resin cement.
✔ Consider delayed post space preparation (24 hours or more) to achieve better bonding conditions.
✔ Air abrasion of the post surface is advisable for mechanical retention.
Conclusion
This scientific overview offers practical guidance for clinicians looking to optimize the retention of fiber posts with self-adhesive resin cements.
Correct dentin treatment, proper timing, and post conditioning are key elements for long-lasting success in endodontic restorations.
References
- Faria-e-Silva AL, et al. (2013). Intraradicular dentin treatments and retention of fiber posts with self-adhesive resin cements. Brazilian Oral Research.
- International Journal of Dental Research (2015). Effects of immediate and delayed intraradicular preparation.
