Abstract
Statement of problem
Prefabricated dowels do not always provide intraradicular sealing in the root canal
dentin, and the lack of sealing predisposes the dowel to adhesive failure and debonding.
It is unclear if fiber-reinforced composite resin dowels provide better sealing.
Purpose
The purpose of this in vitro study was to evaluate the intraradicular sealing and
morphological fit of prefabricated dowels and fiber-reinforced composite resin dowels
in root canal dentin. The thickness of the resin cement layer and push-out bond strength
were determined to assess their effects on the sealing of the dowels.
Material and methods
A total of 50 permanent maxillary central incisors were endodontically treated and
divided into 2 subgroups (n=25). In one group, prefabricated dowels were cemented;
in the second group, fiber-reinforced composite resin dowels were placed. The thickness
of the resin cement layer was assessed in 3 different locations: coronal, middle,
and apical of the root canal dentin with fluorescence confocal laser microscopy. The
push-out bond strength was then determined, and intraradicular sealing observed by
using scanning electron microscopy.
Results
Fiber-reinforced composite resin dowels showed a closer intraradicular fit and seal
in the root canal dentin, and the morphology of the apical portion of the fiber-reinforced
composite resin dowels showed a sealing area with the gutta percha in the apical portion.
The mean thickness of the resin cement layer was significantly reduced for the fiber-reinforced
composite resin dowels compared with the prefabricated dowels (P<.05) in the cervical area (197.0 μm versus 311.0 μm) and in the apical portion of
the root canal (57.3 μm versus 131.6 μm). The mean push-out strength was higher for
the fiber-reinforced composite resin dowels (22.98 N/mm2) than that for the prefabricated dowels (16.49 N/mm2) (P<.05).
Conclusions
The morphological fit of fiber-reinforced composite resin dowels provides better intraradicular
sealing in the cervical and apical portions, reducing the resin cement thickness.
The increased push-out strength can therefore be assumed to result from increased
frictional retention compared with prefabricated dowels.
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Article info
Publication history
Published online: July 01, 2021
Footnotes
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
