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At least 199 records · Page 11Linked to original sources
PubMed1989

[Compressive strength of metal-ceramic occlusal veneers].

Ceramometallic specimens, circular in section, of varying thickness and manufactured by means of different procedures, have been tested to destruction of the ceramic layer under a once-through continuously increasing force at defined points. Identical specimens were used to determine the number of load cycles under increasing continuous stress of 430 N until the ceramic layer failed. The fatigue strength increased with the thickness of the metallic layer and was further increased by a high inherent strength of the ceramic layer. In restorations with only a thin metallic layer (foil crowns) and/or low strength values of the metal (electroplated ceramic crowns) an overall thickness of the layers of more than 1.5 mm is recommended in the occlusal area to avoid premature failure.

Bite Force↗
PubMed1987

Relationship between compressive strength and cervical shaping of the all-ceramic Cerestore crown.

The two types of cervical shaping recommended for the preparation of Cerestore crowns are shoulder or deep chamfer. 14 specimens shaped like stylized Cerestore crowns on a shoulder preparation and 14 on a deep chamfer preparation were produced. Thereafter each crown was placed on the epoxy resin die on which it had been produced. 7 epoxy dies from each of the two series were shortened 1 mm occlusally in order to elucidate the importance of the cervical shaping. Placed on its own epoxy die each of the 28 Cerestore crowns was then subjected to occlusal stress until fracture occurred. The force needed for fracture was three times greater for the crowns produced on a shoulder preparation than for those produced on a chamfer preparation. No significant differences was obtained when crowns with the same cervical shaping were tested on intact and shortened dies respectively.

Aluminum↗