GC EUROPE Kalore - Manual (Page 19)

19
Fracture Toughness (MPa)
0.0 0.5 1.0 1.5 2.0
Filtek Supreme DL †
Filtek Z250 †
Filtek Silorane †
Prisma TPH3 †
EsthetX †
Premise †
Estelite Quick †
4 Seasons †
Grandio †
Tetric Evoceram †
Venus †
CeramX Mono †
KALORE
Fracture Toughness (MPa m1/2)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Esthet-X HD † TPH3 † KALORE Premise † Filtek Supreme †
Flexural Strength (Mpa)
0 20 40 60 80 100 120 140 160 180 200
Filtek Supreme DL †
Filtek Z250 †
Filtek Silorane †
Prisma TPH3 †
EsthetX †
Premise †
Estelite Quick †
4 Seasons †
Grandio †
Tetric Evoceram †
Venus †
CeramX Mono †
KALORE
a
b
a a
a
GC Kalore technical manual
6.4 Fracture Toughness
Fracture toughness, a measure of a
material’s ability to resist the propagation
of a formed crack, is defined as the
toughness against bending stress. the
toughness is calculated as the underlying
area of a stress-strain curve. a higher
value for fracture toughness implies
greater resistance to the catastrophic
propagation of cracks. KALORE
demonstrated high resistance to crack
propagation (Fig. 17).
Independent Testing - OHSU
independent testing of fracture toughness
was conducted by Dr. Ferracane at OHSU
School of Dentistry in accordance with
ASTM E399. Samples (2.5 mm x 5 mm x 25
mm) were made in stainless steel molds,
and a razor blade notch was created at
the mid-span with an a/w of 0.5 (where a
= the length of the notch and w = the
sample height). Specimens were light-
cured for 40 seconds from the top and
bottom in the triad ii unit. the samples
were stored in water at 37ºC for 24 hours
and then tested for three-point bending
(20 mm span) on a universal testing
machine at a cross-head speed of 0.254
mm/minute. the fracture toughness was
determined using the maximum load
(there was no evidence of plastic
deformation). Data was analyzed by the
ANOVA/Tukey’s test to compare the
composites (p < 0.05). The fracture
toughness of all composites was found to
be the same, except for TPH3 (Fig. 18).
6.5 Flexural Strength
The flexural strength was measured in
accordance with ISO4049:2000. KALORE
demonstrated high flexural strength
(Fig. 19).
Figure 17. Fracture toughness of various composite materials.
Source: GC Corporation.
Figure 18. Fracture toughness.
Figure 19. Flexural strength of various composite materials.
Source: GC Corporation.
a. Not statistically different (p=0.05)