Resumo

VEGA DEL BARRIO, José María. Shear resistence of one all-ceramic system versus seven ceramo-metallic systems: a comparative study. RCOE [online]. 2005, vol.10, n.5-6, pp.529-539. ISSN 1138-123X.

The present paper measures and compares the shear resistance of the ceramo-ceramic junction of a new all-ceramic system (made of zyrconium oxide and its specific ceramic) as opposed to seven ceramometalic systems, out of which two are unions made of two combinations between nickel- chromium alloys and ceramics, four consist of cast titanium plus ceramics and one comprises cobalt-chromium and ceramics. For each group, 10 cylinders of appropriate dimensions were used in order to show the results in Mpa. One of the bases of each cylinder was covered by a layer of the relevant ceramic of 1mm thickness and subsequently processed in the oven. Afterwards they underwent a shear resistance test to measure the junction resistance. A total number of 80 samples were tested. The group VI samples correspond to the testing material (all-ceramic system). Results: the highest average values of the shear resistance (showed in Mpa) were given by the all-ceramic system -identified as group VI (47.82 Mpa)-, followed by the cobalt-chromium alloy to ceramic (group VII: 41.82 Mpa) and the nickel-chromium alloys to ceramic (SN group: 40.16 Mpa and group V: 40.32 MPa). The lowest values were given by the cast titanium to ceramic systems (group III: 37.49 Mpa; group IV: 30.74 Mpa; group II: 29.16 Mpa, and group I: 26.18 Mpa). ANOVA and Student Newman- Keuls calculations (p<0.05) were applied. Statistically significant differences were found between group VI and groups I,II and IV.

Palavras-chave : Shear resistance of all-ceramic system; Shear resistance of ceramometalic systems; Cercon; Zirconium oxide.

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