GC EUROPE Kalore - Manual (Page 35)

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GC Kalore technical manual
the following tests were conducted on both
sets of samples to confirm the superior
performance of KalORe and that the filler
particles in KALORE are retained in the matrix:
1. Shrinkage stress test
2. three-body wear resistance test
3. combined polish retention/surface
roughness test
Materials and Methods
1. Shrinkage stress test
Setting shrinkage stress was measured in-house
using a universal testing machine EZ-S
(Shimadzu) with a custom-made jig. Two glass
slides were pre-treated with sandblasting and a
silane coupling agent, then attached to both
the upper and the lower jig. a composite resin
sample (1.66 ml) was placed on the lower glass
slide and pressed by lowering the upper slide
glass on it until a 4 mm clearance remained
between the upper and lower glass slides. the
sample was light-cured for 40 seconds from the
underside using a G-light 11 mm fiber rod, then
light-cured for 20 seconds from above. the
setting shrinkage stress was measured for 20
minutes and the highest figure reached was
recorded as the shrinkage stress.
2. three-body wear resistance test
to measure three-body wear resistance in-house,
composite specimens were prepared and
moved up and down along a 5 cm path at a rate
of 30 strokes per minute. they were held in
indirect contact with an acrylic plate under a
load of 350 gf (3.43N) and, simultaneously, the
sample holder slid horizontally along a 2 cm
path at a rate of 30 strokes per minute. a
mixture of PMMA and glycerol (1:1 volume) was
used as an intermediate abrasive. after 100,000
cycles (with one complete lateral and vertical
movement being defined as one cycle), material
wear was evaluated by measuring height loss.
Following this test, samples of composites were
processed for scanning electron microscopy
(SEM) imaging.
Figure 1. Universal testing machne EZ-S (Shimadzu) with custom jig.
Figure 2. three-body wear resistance test set-up.
Sample
Glass slide
Silane coupling on
sandblasted surface
G-light
PMMA/glycerol slurry
350 gf load