GC EUROPE Kalore - Manual (Page 18)

18
Shrinkage Stress (N)
0 2 4 6 8 10 12 14 16 18
Filtek Supreme DL †
Filtek Z250 †
Filtek Silorane †
Prisma TPH3 †
EsthetX †
Premise †
Estelite Quick †
4 Seasons †
Grandio †
Tetric Evoceram †
Venus †
CeramX Mono †
KALORE
Modulus of Elasticity (GPa)
0 2 4 6 8 10 12 14 16 18 20
Filtek Supreme DL †
Filtek Z250 †
Filtek Silorane †
Prisma TPH3 †
EsthetX †
Premise †
Estelite Quick †
4 Seasons †
Grandio †
Tetric Evoceram †
Venus †
CeramX Mono †
KALORE
GC Kalore technical manual
Figure 14. Shrinkage stress of various composite materials.
Source: GC Corporation.
6.3 modulus of elasticity
The modulus of elasticity (Young’s
modulus), a measure of the rigidity of
the material, is defined by the initial
slope of a stress-strain curve. a material
with a high modulus is stiff and rigid,
whereas a material with a low modulus
is flexible. Ideally, a material should not
have too high a modulus of elasticity as
brittle materials are less able to buffer
masticatory pressure. the modulus of
elasticity for KalORe was determined
in accordance with ISO 4049
specifications for flexural strength
measurements. KALORE behaved like
a rigid material, yet was elastic
enough to buffer masticatory pressure
(Fig. 16).
Figure 16. modulus of elasticity of various materials.
Source: GC Corporation.
Figure 15. Universal testing machine EZ-S (Shimadzu)
with custom-made jig.
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 glass slide 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. KALORE demonstrated the
lowest shrinkage stress of all products
tested (Fig. 14).
Sample
Glass slide
Silane coupling on
sandblasted surface
G-light