Biomedical Engineering Reference
In-Depth Information
Crown
retention,
Kg/Force
Net setting
time, min
Film thickness,
m
Compressive
strength, MPa
Material
Ca-aluminate
based
4.8
15
196 (at 30days)
38.6
Ketac Cem
-
19
-
26.6
RelyX-Unicem
-
-
157
39.4
Table 12. Selected properties, Test methods according to SO
9917-1
Material
aspects
Glass
Ionomer
(GI)
Resin-
modified GI
Resin
(bonded)
Self-adhesive
Resin
Zn-
phosphate
cement
Ceramir
C&B
1. Type
of material
Polymer
Monomer
Monomer
Monomer
Inorganic
material
Ceramic-
polymer
2. Hardening
mechanism
Cross-
linking
Poly-
merisation
Poly-
merisation
Poly-
merisation
Acid-base
reaction
Acid-base +
cross-linking
3. pH
Acidic
Acidic
Acidic
/neutral
Acidic
/neutral
Acidic
Acidic
/basic
4. Geo-
metrical
stability
Non-
shrinking
Non-
shrinking
Shrinks
Shrinks
Non-
shrinking
Non-
shrinking
5. Stability
over time
Degrades
Degrades
Degrades
Degrades
Degrades
Stable
6. Extra
treatment
-
-
Etching and
bonding
-
-
-
7. Hydro-
philic /
phobic
Hydro-
philic
Hydrophilic Hydrophobic
Initially
hydrophilic,
Hydrophobic
Hydrophilic Hydro-philic
8. Integration
mechanism
Micro-
mechani-
cal
retention,
Chemical
bonding
Micro-
mechanical
retention /
Chemical
bonding /
Adhesion
Adhesion /
Micro-
mechanical
retention
Adhesion /
Micro-
mechanical
retention
Micro-
mechanical
retention
Nano-
structural
integration
9. General
behaviour
Irritant
Allergenic
Allergenic
Allergenic
Non-
allergenic
Non-
allergenic
10. Biocom-
patibility
Good
OK
OK
OK
Good
Good
11. Bioactivty
No
No
No
No
No
Bioactive
12. Sealing
quality
OK
OK
Good but
operation
sensitive
OK
Acceptable
Excellent
Table 13. Overview of dental luting cements (Hermansson et al, 2010)
Material aspects 4-12 in Table 13 are also relevant for all other Ca-aluminate based dental
applications.
