IPS e.max CAD Lithium Disilicate Study
Van Thompson DDS
Petra Guess
Single crowns made of IPS e.max lithium disilicate can be…
3X STRONGER
than a Zirconia single unit crowns!
Buccal Lingual cusp loaded increasing
cyclical load every 10k cycles until failure
Use Level P r ob ab ilit y Log n or m al
99.00
Use Level
CB@90%2-Si ded
Ema x Ce ram HandL Y-TZP
Cumula tiv e Damage
L ognormal
200 N L oad
F =17 | S=1
St d= 0. 08; Al pha(0)= 10. 10; Al pha(1)= 0. 24
U n re l i a b i l i ty
Data Poi nts
Use Level Li ne
Top CB-I
50.00
10.00
5.00
1.00
10000
Bottom Radial Crack
100000
Cyc les
1000000
Fatigue Zirconia
supported / Press-on
200 N
40 K
Load
300 N
50 K
Load
Fatigue IPS e.max CAD Lithium Disilicate
Survivor at 900 N and 180 K cycles (profile I)
Fatigue IPS e.max CAD Lithium Disilicate
Survivor at 900 N and 180 K cycles (profile I)
Only superficial damage at load surface
IPS e.max CAD
Lithium Disilicate
Biaxial mouth motion step stress fatigue
• No Cracks - only superficial surface damage
• Specimens were tested up to 900 N of force
with 180,000 cycles and no cusp shearing !
Survival of test materials based
on Load and Number of Cycles
Crowns
Zirconia veneered
Zirconia pressed
Lithium Disilicate
0
200
400
600
800
Load (N) and cycles per thousand
Load
cycles (x 1000)
1000
IPS e.max CAD Lithium Disilicate
“This is by far the most robust system
we have tested to date”
Van Thompson DDS