Statement of problem
The effects of surface treatment on the retention of prefabricated fiber-reinforced
epoxy resin posts are not well understood because most studies measure retention shortly
after cementation, without artificial aging.
Purpose
The purpose of this study was to evaluate the effect of surface treatment on the retention
of glass-fiber endodontic posts luted with resin cement and subjected to artificial
aging.
Material and methods
Thirty-two single-rooted teeth were selected, the coronal aspect of each tooth was
removed, and the remaining root received endodontic therapy. Specimens were then divided
into 4 groups (n=8). Post spaces were prepared to a depth of 10 mm by using ISO 90
rotary instruments. The tapered posts received 1 of 4 surface treatments: cleaning
with alcohol (Alc), cleaning with alcohol and conditioning with ED-Primer material
(Alc-ED), airborne-particle abrasion (Air), or airborne-particle abrasion and conditioning
with ED-Primer material (Air-ED). All posts were luted with a composite resin luting
agent (Panavia F) after conditioning the canal dentin with autopolymerizing dentin
primer (ED-Primer) and without acid etching of the canal dentin. After cementation,
the specimens were stored in water at 37°C for 30 days and subjected to simulated
aging conditions consisting of 7500 thermal cycles (5°C/55°C) and 300,000 mechanical
loading cycles with 30 N. Retention (N) of the posts was measured with a universal
testing machine with a crosshead speed of 2 mm/min. The data were analyzed using 1-way
ANOVA and the Tukey HSD test (α=.05). The dislodged posts were also examined microscopically
at ×8 and ×20 magnification to evaluate the mode of failure.
Results
The mean retentive values (N) and SDs of the test groups were as follows: Alc, 375.9
± 85.0; Alc-ED, 421.2 ± 46.8; Air, 534.8 ± 65.8; and Air-ED, 555.8 ± 86.9. Airborne-particle–abraded
posts had significantly higher retention compared with nonabraded posts (P<.001). Treating the post's surface with ED-Primer material prior to cementation had
no significant effect on retention. The failure mode was purely adhesive at the resin
cement–post interface for all nonabraded posts. A mixed failure mode, adhesive at
the resin cement–dentin interface, at the resin cement–post interface, and cohesive
in the resin cement, was observed for airborne-particle–abraded posts.
Conclusion
Treating the surface of the posts with ED-Primer material before cementation with
Panavia F cement produced no significant improvement in the retention of the posts.
Airborne-particle abrasion of the surface of the post significantly improved the retention.
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Article info
Publication history
School of Dentistry, Christian-Albrechts University at Kiel, Germany
Identification
Copyright
© 2006 The Editorial Council of The Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
