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The effect of cement thickness on the fracture strength of all-ceramic crowns.

The effect of cement thickness on the fracture strength of all-ceramic crowns.

Australian dental journal (1995-02-01)

M Tuntiprawon, P R Wilson

摘要

The effect of increasing cement thickness on the fracture strength of aluminous porcelain jacket crowns was investigated in this study. Thirty-three aluminous porcelain jacket crowns were divided into three groups. In Group 1, only platinum foil was used to provide cement space. In Group 2 two layers and Group 3 four layers of die spacer were painted onto the metal die before impression taking. Each crown was cemented onto a metal die with zinc phosphate cement and loaded until fracture. The maximum force to break each crown was recorded. The average fracture load was 408 N for Group 1,365 N for Group 2 and 324 N for Group 3. ANOVA (SPSS) found a significant difference (p < 0.05) between groups. A Scheffe Test revealed a significant difference between Groups 1 and 3. It was concluded that increasing the cement thickness above 70 microns reduced the fracture strength of porcelain jacket crowns.

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铂, foil, 25x25mm, thickness 0.1mm, as rolled, 99.99+%

铂, foil, 25x25mm, thickness 0.1mm, as rolled, 99.95%

铂, foil, 50x50mm, thickness 0.125mm, as rolled, 99.95%

铂, foil, not light tested, 100x100mm, thickness 0.0125mm, as rolled, 99.95%

铂, foil, 15x15mm, thickness 0.2mm, as rolled, 99.95%

铂, foil, 50x50mm, thickness 0.1mm, as rolled, 99.95%

铂, foil, 25x25mm, thickness 0.25mm, as rolled, 99.99+%

铂, foil, 25x25mm, thickness 0.125mm, as rolled, 99.95%

铂, foil, 25x25mm, thickness 0.125mm, as rolled, 99.99+%

铂, foil, not light tested, 50x50mm, thickness 0.025mm, as rolled, 99.95%

铂, foil, light tested, 25x25mm, thickness 0.05mm, as rolled, 99.95%

铂, foil, 25x25mm, thickness 0.25mm, as rolled, 99.95%

铂, foil, 50x50mm, thickness 0.125mm, as rolled, 99.99+%

铂, foil, not light tested, 25x25mm, thickness 0.0025mm, as rolled, 99.95%

铂, foil, 50x50mm, thickness 0.1mm, as rolled, 99.99+%

铂, foil, 10mm disks, thickness 0.025mm, as rolled, 99.95%

铂, foil, 10mm disks, thickness 0.1mm, as rolled, 99.99+%

铂, foil, 4mm disks, thickness 0.125mm, as rolled, 99.99+%

铂, foil, not light tested, 100x100mm, thickness 0.0025mm, as rolled, 99.95%

铂, foil, not light tested, 25x25mm, thickness 0.01mm, as rolled, 99.95%

铂, foil, 0.1m coil, thickness 0.025mm, coil width .85mm, as rolled, 99.95%

铂, foil, 6mm disks, thickness 0.025mm, as rolled, 99.95%

铂, foil, 30x30mm, thickness 0.2mm, as rolled, 99.95%

铂, foil, 0.1m coil, thickness 0.05mm, coil width 1mm, as rolled, 99.99%

铂, foil, 15mm disks, thickness 0.005mm, as rolled, 99.95%

铂, foil, light tested, 25x25mm, thickness 0.025mm, as rolled, 99.99+%

铂, foil, not light tested, 25x25mm, thickness 0.025mm, as rolled, 99.99+%

铂, foil, 25x25mm, thickness 0.25mm, as rolled, 99.999%

铂, foil, 0.1m coil, thickness 0.025mm, coil width 5mm, as rolled, 99.95%

铂, foil, 10mm disks, thickness 0.01mm, as rolled, 99.95%