Mechanical performance of CAD_CAM materials adhesively
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e4 dental materials 34(S1) (2018) e1–e141
Materials and methods: Thirty discs of Suprinity (10 mm
in diameter and 2 mm in thickness) were made and divided
into three groups according to the antagonist. Ten cylinders
of each antagonist material (15 mm in height and 4mm in
diameter, flat) were also made. The parameters for the sim-
ulation of wear were: 30 N, horizontal movement of 6 mm,
and 1.7 Hz, totaling 300,000 cycles in water. Wear measure-
ments on the ZLS specimens and on the antagonists were
performed. Roughness, hardness, and digital optical profilo-
metry measurements were also performed. The means of
wear, roughness, and hardness were subjected to one-way
ANOVA and Tukey’s test (95%).
Results: The results were not statistically significantly
different for roughness (p=0.08), but differed for hardness
(p = 0.000). With the profilometry images, it was possible to
observe the different wear patterns depending on the antago-
nist and quantify the volumes worn with steatite and zirconia,
which were statistically significantly different (p = 0.001). CAD-
waxx promoted a superficial wear that could not be quantified.
After the statistics for the wear of the antagonists were gath-
ered, it was observed that there were differences in wear
among all groups (p = 0.000).
Conclusions: It can be concluded that zirconia promoted
marked wear of ZLS. Steatite caused intermediate wear, and
resin/CAD-waxx caused no wear of ZLS.
https://doi.org/10.1016/j.dental.2018.08.008
8
Mechanical performance of CAD/CAM
materials adhesively bonded to NG10
I.S.S.L. Weitzel
1
, M.P. Perim
1
, J.H.R. Rangel
1
,
L.R. Silva-Concílio
1
, A.L.S. Borges
2
,
R.M. Melo
2
,M.Amaral
1,∗
1
University of Taubate, Brazil
2
Sao Paulo State University/SJC, Brazil
Purpose/aim: To evaluate the hardness, fracture tough-
ness, load to failure, fatigue and stress distribution with
finite element analysis (FEA) of lithium disilicate (LD), felds-
pathic ceramic (FC), resin matrix ceramic (RM) and nanohybrid
composite (NC) when adhesively cemented to a dentin-like
substrate (NG10).
Materials and methods: Disc shaped samples were man-
ufactured from each material (N = 45), which were polished.
Hardness was measured in a microhardness tester (19.61 N,
12 s, Knoop indenter, n = 5). Indented samples were subjected
to biaxial flexural strength, and the fracture origin defect
was measure under microscopy for determination of frac-
ture toughness. Remaining discs were adhesively cemented
to NG10. Twenty samples were subjected to load-to-failure
test, and other 20 samples were subjected to cyclic fatigue
(400 N, 1,000,000 cycles), samples were checked every 200 K
cycles for verification of catastrophic failure. A 3D model of
the cemented discs was constructed in design software and
imported to finite element analysis software, were the elas-
tic properties of the materials were inserted and a mesh was
generated. A 100N load, normal to surface, was applied to the
restorationsurface and stress distribution was evaluated. Data
were subjected to statistical analysis (ANOVA and Tukey’s test,
˛ = 0.05) and Weibull analysis.
Results: LD presented the highest hardness and fracture
toughness values and the highest stress concentration val-
ues in FEA at the disc cementation surface. The NC presented
to lowest values of hardness and stress concentration, and
the FC presented the lowest values of fracture toughness. One
sample of LD and one of NC fractured during fatigue test, but
there was no variation of failure rate along time for evaluated
materials (ˇ = 1). LD and RM presented high rate of samples
with internal cracks after fatigue (55% and 75% respectively).
The FC presented the lowest debonding rate on load-to-
failure test and absent of catastrophic fractures or cracks
during fatigue.
Conclusions: Materials tested presented different mechan-
ical behaviors according to the test performed.
https://doi.org/10.1016/j.dental.2018.08.009
9
Dentin pre-treatment with EGCG solution:
Long-term nanoleakage and bond strength
M.P.N. Fialho
1
, R.P. Nogueira
2
, F.G.M. Franc¸a
1
,
C.P. Turssi
1
, R.T. Basting
1
, V. Hass
3
,
F.L.B. Amaral
1,∗
1
São Leopoldo Mandic Dental School and Research
Center, Brazil
2
Florence Institute, Brazil
3
Ceuma University, Brazil
Purpose/aim: This study evaluated the effect of dentin
pre-treatment with EGCG at different concentrations on
long-term bond strength (TBS) and nanoleakage (NL) of
etch-and-rinse adhesive system to caries affected dentin
(CAD).
Materials and methods: Dentin fragments of 40 human
molars were submitted to a microbiological caries induction
protocol for 14 d. After caries removal, fragments contain-
ing CAD surfaces were randomly divided into 5 groups
(n = 8), according to dentin pre-treatment performed after
acid etching for 15 s: 0.02% EGCG; 0.2% EGCG; 0.5% EGCG;
2% Chlorhexidine [CHX] and without treatment as a con-
trol group – [C]. The etch-and-rinse adhesive system (Adper
Single Bond 2, 3M ESPE) was applied according to the manu-
facturer’s instructions and composite resin restorations were
built on CAD. After 24 h, the teeth were sectioned in order to
obtain “sticks” (1 mm
2
) that were randomly subdivided into
two groups according to the moment they were submitted to
TBS and NL testings: immediately or after 1 year of storage
in distilled water.
Results: The data were statistically analysed by two-way
ANOVA and Tukey’s test (˛ = 0.05). The application of EGCG,
at different concentrations, and CHX did not affect immedi-
ate TBS (p> 0.05). After 1Y, there was significant decrease
in TBS for all experimental groups (p < 0.05). For NL, groups
that received dentin pre-treatments showed reduced NL in
comparison to C group, regardless of water storage period
(p < 0.001). CHX group showed lower NL but with no signifi-
cant difference from 0.02% and 0.5% EGCG groups (p< 0.001).
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