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|Type:||Artigo de periódico|
|Title:||Fracture Strength Of All-ceramic Crowns|
|Abstract:||This paper compares the fracture strength of three types of all-ceramic crown shape systems (In ceram, OPC® and IPS Empress) cemented with either a commercial resin cement, zinc phosphate or glass ionomer. Twenty test crown shapes with 8 mm diameter and 8.5 mm height were fabricated for each type of ceramic. Ten In ceram crown shapes were luted on the die using zinc phosphate, while ten OPC® and IPS Empress were luted using resin cement specified for the particular system. Another ten specimens each, of In ceram, OPC® and IPS Empress, were luted on the die using a glass ionomer. The crown shapes were fractured in a mechanical testing machine (Instron) using a steel ball, 4 mm diameter, that contacted the occlusal surface and the resulting data were statistically analysed using a Mann-Whitney test. The results showed that: (1) In ceram crown shapes luted with zinc phosphate were significantly stronger than IPS Empress crown shapes luted with resin cement (p < 0.05), but no difference was observed compared with OPC® crown shapes luted with resin cement. No statistical difference was found between OPC® and IPS Empress crown shapes. (2) When the three ceramics were luted with glass ionomer, the In ceram was significantly stronger than OPC® (P < 0.05) and IPS Empress (p < 0.05). OPC® was significantly stronger than IPS Empress (p < 0.05).The fracture strength of In ceram, OPC and IPS Empress cemented with either a commercial resin cement, zinc phosphate or glass ionomer was compared. Twenty test crown shapes with 8 nm diameter and 8.5 mm height were fabricated for each type of ceramic. The crown shapes were fractured in a mechanical testing machine using a steel ball, 4 mm diameter. The resulting data were statistically analysed using a Mann-Whitney test.|
|Editor:||Kluwer Academic Publishers, Dordrecht, Netherlands|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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