Effect of insertion method on knoop hardness of high viscous glass ionomer cements

Brazilian Dental Journal

Daniela Prócida Raggio²  Clarissa Calil Bonifácio¹  Marcelo Bönecker²  José Carlos P. Imparato²  Anton J. De Gee¹  Willem Evert Van Amerongen¹ 

[1] ,University of São Paulo Dental School Department of Pediatric DentistrySão Paulo SP ,Brazil

关键词: glass-ionomer cement;    Knoop hardness;    insertion;    Atraumatic Restorative Treatment;   

DOI  :  10.1590/S0103-64402010000500011

来源: SciELO

【 摘 要 】

The aim of this study was to assess the Knoop hardness of three high viscous glass ionomer cements: G1 - Ketac Molar; G2 - Ketac Molar Easymix (3M ESPE) and G3 - Magic Glass ART (Vigodent). As a parallel goal, three different methods for insertion of Ketac Molar Easymix were tested: G4 - conventional spatula; G5 - commercial syringe (Centrix) and G6 - low-cost syringe. Ten specimens of each group were prepared and the Knoop hardness was determined 5 times on each specimen with a HM-124 hardness machine (25 g/30 s dwell time) after 24 h, 1 and 2 weeks. During the entire test period, the specimens were stored in liquid paraffin at 37ºC. Significant differences were found between G3 and G1/G2 (two-way ANOVA and Tukey's post hoc test; p<0.01). There was no significant difference in the results among the multiple ways of insertion. The glass ionomer cement Magic Glass ART showed the lowest hardness, while the insertion technique had no significant influence on hardness.

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