Abstract
Statement of problem
Straight preparable abutments provide an alternative to titanium bases (Ti-bases)
for single-unit screw-retained implant-supported restorations. However, the debonding
force between crowns with a screw access channel cemented to preparable abutments
and Ti-bases of different designs and surface treatments is unclear.
Purpose
The purpose of this in vitro study was to compare the debonding force of screw-retained
lithium disilicate implant-supported crowns cemented to straight preparable abutments
and Ti-bases of different designs and surface treatments.
Material and methods
Forty laboratory implant analogs (Straumann Bone Level) were embedded into epoxy resin
blocks that were randomly divided into 4 groups (n=10 each) according to the abutment
type used: CEREC group, Variobase group, airborne-particle abraded Variobase group,
and airborne-particle abraded straight preparable abutment group. All specimens were
restored with lithium disilicate crowns and cemented with resin cement to the corresponding
abutments. They were thermocycled (from 5 to 55 °C for 2000 cycles) followed by cyclic
loading (120 000 cycles). The tensile forces required to debond the crowns from the
corresponding abutments were measured (N) by using a universal testing machine. The
Shapiro–Wilk test of normality was used. Comparison between the study groups was done
with 1-way ANOVA (α=.05).
Results
Tensile debonding force values were significantly different according to the type
of abutment used (P<.05). The highest retentive force value was recorded in the straight preparable abutment
group (928.1 ±222.2 N) followed by the airborne-particle abraded Variobase group (852.6
±164.6 N), and the CEREC group (498.8 ±136.6 N); the lowest value was reported in
the Variobase group (158.6 ±85.2 N).
Conclusions
The retention of screw-retained lithium disilicate implant-supported crowns cemented
to airborne-particle abraded straight preparable abutments is significantly higher
than to non-surface treated Ti-bases and similar to airborne-particle abraded ones.
Abrading abutments with 50-mm Al2O3 significantly increased the debonding force of the lithium disilicate crowns.
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Article info
Publication history
Published online: February 20, 2023
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2023 by the Editorial Council for the Journal of Prosthetic Dentistry.
