Figures & tables
From the following article
Crowns and extra-coronal restorations: Materials selection
R W Wassell, A W G Walls & J G Steele
British Dental Journal 192, 199 - 211 (2002) Published online: 23 February 2002
doi:10.1038/sj.bdj.4801334
Figure 1
A bent cast post has resulted in failure (note the failed composite cementation). Proper alloy selection and heat treatment will produce a more rigid casting, capable of resisting distortion from occlusal forces.
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Figure 2
In-Ceram glass infused alumina cores prior to porcelain application (Courtesy of Vita)
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Figure 3
The press ceramic furnace used for the construction of injection moulded IPS Empress crowns (Courtesy of Ivoclar).
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Figure 4
A die is scanned for a Procera AllCeram coping (outline of scan is in the background), which is made centrally in either Sweden or the USA (Courtesy of Nobel Biocare)
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Figure 5
A Captek coping for a ceramo-metal restoration of a central incisor. The buccal margin will be thinned to a micro-margin prior to porcelain application. Captek is unusual in that it resists firing distortion resulting from differential thermal contraction of metal and porcelain.
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Figure 6
Schematic diagram showing how a Captek core is laid down as gold alloy impregnated wax sheets: a) the granular appearance of Captek W after the first wax layer has been burnt off; b) application of the second wax layer (Captek G); c) perfusion of the Captek W by the Captek G during the second firing; and d) the resulting composite metal structure after firing (Courtesy of Schottlander).
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