Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/100639
Type: Artigo de periódico
Title: Fracture Strength Of All-ceramic Crowns
Author: Sobrinho L.C.
Cattell M.J.
Knowles J.C.
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
Rights: fechado
Identifier DOI: 10.1023/A:1008905308040
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0009629095&partnerID=40&md5=f4cae322a044fe27f7d00e9e54faa62f
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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