Abstract
Statement of problem
An intraradicular retainer formed by multiple independent glass fiber filaments was
developed aiming to allow better adaptation in flattened root canals; however, the
performance of the new posts is unclear.
Purpose
The purpose of this in vitro study was to compare the bond strength (BS) and adhesive
interface quality achieved in flattened root canals restored with conventional glass
fiber posts (CFPs) and multifilament glass fiber posts (MFPs).
Material and methods
The distal roots of mandibular molars with long oval root canals were endodontically
treated, and the obturation material was removed and assigned to 2 groups (n=11) according
to the type of retainer used: CFP (WhitePostDC#0.5; FGM) or MFP (CometTail#4; Synca).
The posts were cemented with self-adhesive resin cement. The specimens were sectioned
(2 slices per third). The most cervical slice in each third was used to evaluate the
BS, while the adhesive interface in the apical slices was analyzed by scanning electron
microscopy. BS data were analyzed by using a multilevel generalized linear model,
and adhesive interface SEM data were analyzed by using a multilevel ordinal logistic
regression model (α=.05).
Results
Multilevel regression showed a statistically significant difference for the “type
of retainer” factor (P=.001; CFP 2.61 ±1.30>MFP 1.59 ±1.54). No statistically significant differences were
found for the “root thirds” factor (P=.346) or for the interaction of both factors (P=.114). The failure pattern was predominantly mixed or adhesive for CFP and adhesive
to dentin for MFP. A better adaptation of the restorative material was observed in
the cervical third for CFP and in the apical third for MFP (P<.001).
Conclusions
MFP resulted in lower BS values than CFP, with a higher prevalence of adhesive failures
to dentin and better adaptation of the adhesive interface in the apical third.
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Article info
Publication history
Published online: July 18, 2020
Identification
Copyright
© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
