J Adv Prosthodont.  2013 Feb;5(1):16-20. 10.4047/jap.2013.5.1.16.

Retention of fiber posts to the optimally and over-prepared dowel spaces

• Othman HI
• Elshinawy
• Abdelaziz

• KMID: 2284767
• DOI: http://doi.org/10.4047/jap.2013.5.1.16

Abstract

PURPOSE
To assess the retention of glass fiber post cemented with self-adhesive resin cement into optimum and over-prepared root canals following obturation in the presence of either eugenol (EB) or calcium hydroxide (CB)-based sealers.
MATERIALS AND METHODS
Roots of extracted premolars were endodontically-treated in 5 groups (n = 10). Roots of Group 1 (control) were left with no obturation and then optimally prepared to receive endodontic dowels. Other root canals were obturated with gutta-percha in the presence of either eugenol-based (Groups 2 and 4) or calcium hydroxide-based (Groups 3 and 5) sealer. Dowel spaces were prepared with optimal diameter in Groups 2 and 3, one size larger in Groups 4 and 5. Standardized fiber posts were luted to the prepared spaces using self-adhesive resin cement and itsretention was then tested on an universal testing machine. Both one-way ANOVA and Tukey's HSD comparisons (alpha=0.05) were used to identifythe significance of inter-group retention differences. Scanning electron microscopy (SEM) of both optimally and over-prepared dowel spaces was also considered to figure the nature of their interior out.
RESULTS
The post retention was significantly higher to the non-obturated, optimally-prepared dowel spaces of Group 1 compared to the obturated, optimally-prepared ones of Groups 2 and 3. For each dowel space diameter, root canals obturated using CB of Groups 3 and 5 showed significantly higher dowel retention compared to those obturated using EB of Groups 2 and 4. Post retention to the over-prepared dowel spaces of Groups 4 and 5 was significantly higher than that recorded for the optimally-prepared ones of Groups 1-3. SEM images revealed traces of endodontic sealer and gutta-percha on the walls of the optimally-prepared dowel spaces.
CONCLUSION
Despite the adverse effect of endodontic sealers on the retention of fiber posts, the over-preparation of dowel spaces helps to improve the retention.

Keyword

Dowel space; Fiber post; Endodontic sealer; Retention; Resin cement; Over-preparation

MeSH Terms

Bicuspid
Calcium
Calcium Hydroxide
Collodion
Dental Pulp Cavity
Eugenol
Glass
Gutta-Percha
Hydroxides
Microscopy, Electron, Scanning
Resin Cements
Retention (Psychology)
Calcium
Calcium Hydroxide
Collodion
Eugenol
Gutta-Percha
Hydroxides
Resin Cements

Figure

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  Fig. 1 Schematic drawing showing the attachment and orientation of test specimen at the time of retention testing.

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  Fig. 2 SEM of roots' cross-section following optimal (A) and over (B) preparation of dowel spaces.

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  Fig. 3 SEM of roots' longitudinal-section following optimal (A) and over (B) preparation of dowel spaces.

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