Title: Microtensile bond strength of composite cement to novel CAD/CAM materials as a function of surface treatment and aging
Authors: Lise, DP ×
Van Ende, A
De Munck, J
Vieira, L
Baratieri, LN
Van Meerbeek, Bart #
Issue Date: 30-Sep-2016
Publisher: University of Washington, School of Dentistry
Series Title: Operative Dentistry
Article number: [Epub ahead of print]
Abstract: Objectives: To evaluate the effect of different
surface treatments on the bond strength to a
composite and a polymer-infiltrated ceramic
CAD/CAM block after six-month artificial aging.
Methods and Materials: Two types of CAD/CAM
blocks (Cerasmart, GC; Enamic, Vita Zahnfabrik)
were cut in slabs of 4-mm thickness,
divided into six groups, and subjected to the
following surface treatments: group 1: no
treatment; group 2: sandblasting (SB); group
3: SB + silane (Si); group 4: SB + Si + flowable
composite (see below); group 5: 5% hydrofluoric
acid etching (HF) + Si; and group 6: 37%
phosphoric acid etching (H3PO4) + Si. Sections
of the same group were luted together (n=3: 3
sandwich specimens/group) using a dual-cure
self-adhesive cement for all groups, except for
the sections of group 4 that were luted using a
light-curing flowable composite. After three
weeks of storage in 0.5% chloramine at 378C,
the sandwich specimens were sectioned in
rectangular microspecimens and trimmed at
the interface to a dumbbell shape (1.1-mm
diameter). One half of the specimens was
subjected to a microtensile bond strength
(lTBS) test, and the other half was tested after
six months of water storage (aging). Data were
statistically analyzed with a linear mixed-effects
model for the factors surface treatment,
material type, and aging, together with their
first-degree interactions (a=0.05).
Results: The lowest bond strengths were obtained
in the absence of any surface treatment
(group 1), while the highest lTBSs were obtained
when the surface was roughened by
either SB or HF, this in combination with
chemical adhesion through Si. Loss in bond
strength was observed after six-month aging
when either surface roughening or silanization,
or both, were omitted.
Conclusions: Both the composite and polymerinfiltrated
ceramic CAD/CAM blocks appeared
equally bonding-receptive regardless of the
surface treatment used. Creating a microretentive
surface by either SB or HF, followed by
chemical adhesion using Si, is mandatory to
maintain the bond strength after six months.
ISSN: 0361-7734
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biomaterials - BIOMAT
× corresponding author
# (joint) last author

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