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What is the strongest glue for ceramics? 

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If this is the case, it is also expected to contribute to the toughness of zirconia ceramics.
This is, to the best of our knowledge, the highest fracture toughness for HAP or β -TCP ceramics reported thus far.
The bending properties show a significant improvement when 30% (w/w) glue is used, the glue being a mixture between bone and sodium lignosulfonate glues.
It is notable that such values are comparable to the properties of equivalent bulk ceramics.
The obtained results also indicate that the fracture toughness of ceramics is more critical than their hardness.
SIGNIFICANCE The present closed-form solutions provide a basis for evaluating the biaxial strength of multilayered dental ceramics.
Layered ceramics are, compared to conventional monolithic ceramics, a good choice for highly loaded structural applications having improved fracture toughness, strength and mechanical reliability.
High-strength ceramics are preferred in situations where the material is exposed to high masticatory forces.
Electron probe microanalysis revealed that components of the veneering ceramics remained on the zirconia surface after debonding, suggesting that fractures occur in the veneering ceramics and that improving the strength of the veneering ceramics themselves might increase bond strength.
It is representative for many ceramics.
The glue is used highly economically, dries within less than a second after extrusion and can remain stable for years.
The technique should be readily applicable to other ceramics.
Thus, the most superior products meet the standards for commercial porous ceramics.
These properties are comparable to those for ceramics obtained through conventional ceramic processing.
This process is suitable for joining of various kinds of advanced ceramics.

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